Fuel Injection
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=43088
Printed Date: May-02-2024 at 1:54am
Topic: Fuel Injection
Posted By: KenVan
Subject: Fuel Injection
Date Posted: July-05-2018 at 1:53pm
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I have a '68 CC Mustang with a 289, 4 bbl. I would like to convert to fuel injection. There are several kits out there that seem like they'd work well. Howel Engineering has told me that their system will work very well without the O2 sensor, and this would certainly simplify the installation. Have any of you converted your motors to EFI? How did it go? What issues did you encounter? What system did you use? I'm sure that some of you might be sickened by the idea of scraping a carb and you might even feel compelled to leave a not-so-nice comment here. Please don't. I would appreciate only constructive ideas from people who have ventured down this path. Personally, I think 4 bbl carbs are among the coolest things to sit atop a motor...but this is 2018. Carbs are headed in the same direction as the dinosaurs and EFI is a wonderful thing. . ------------- '68 CC Mustang, original owner |
Replies:
Posted By: Jonny Quest
Date Posted: July-05-2018 at 2:10pm
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Several informative threads here about that. Bottom line: Very difficult to find a marine-specific and USCG approved fuel injection system. Also, due to the wet exhaust systems, the Oxygen Sensor required for fuel injection is a difficult problem to solve. Most will tell you to spend the money on a new carb, distributor and intake manifold. Just my 2 cents... JQ ------------- Current 2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
Posted By: Gary S
Date Posted: July-05-2018 at 2:37pm
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Using your thinking “it’s 2018” leave the Mustang alone and buy a FI boat. If you insist of wanting a 68 fuel injected boat drop in a new motor and take advantage of a true computer controlled fuel injected engine instead as also fits pieced together system IMHO. ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: KenVan
Date Posted: July-05-2018 at 3:05pm
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Thank you. USCG approval is a concern...but I would think EFI would be much safer than a carb in all respects. Also, O2 sensor is optional on some kits. What I've learned is that the O2 sensor provides vital feedback when the motor is under varying 'strain' or load. For example; in a car, you have multiple gear ratios, a shifting transmission, uphill strain, downhill strain, quick acceleration for passing, towing strain, etc. In a boat, you have one forward gear and relatively steady drag throughout the throttle range. Therefore, the fuel delivery curve on a boat motor can be programmed and set into the EFI computer upon setup, and then it's fixed. You can always tweak the program if necessary, but . This method is not as efficient as getting O2 sensor feedback into the computer, but the boat operator will never notice the difference and the system (so I've been told) will work swimmingly. I want "turn key" every spring, without fail. ------------- '68 CC Mustang, original owner |
Posted By: KenVan
Date Posted: July-05-2018 at 3:12pm
It's complicated... The lake we live on has horsepower limits imposed in the 1970's; 140 HP and 18' length max. I would buy a new Nautique, but I can't put it on this lake. My boat has been 'grandfathered' in since we owned it prior to the regulations. I need to keep this baby running. A neighbor of ours bought a Nautique 176, and they made him put a 4 cylinder engine in it. It can barely get out of it's own way. So sad. ------------- '68 CC Mustang, original owner |
Gary S wrote:Posted By: KENO
Date Posted: July-05-2018 at 3:18pm
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If I was thinking about maybe doing something like this, I might talk to the outfit in the link since they advertise a marine EFI system for 302 Fords (not exactly your 289) I have no knowledge about dealing with the company, but have seen their stuff on older Jeeps and it worked well. https://www.affordable-fuel-injection.com/product/ford-optimum-marine-series-tbi-kit/#_form_47" rel="nofollow - link |
Posted By: Gary S
Date Posted: July-05-2018 at 3:51pm
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Please understand I'm just being devils advocate. It does not matter to you if you feel a FI system is safer than a carb,it's the Coast Guard who determines that. Say if you did use non approved components and something happened,a sharp lawyer could put you into a world of hurt. That said are you looking for an off the shelf throttle body type system or port injection system you could build up yourself like a http://megasquirt.info/" rel="nofollow - Megasquirt system and using say 5.0 Mustang intake components? Maybe you could find a working PCM Pro Tec system- the hurtle there being finding a working system and making a 351 distributor fit a 289. It's going to be alot of work any way you go. Do you have an Interceptor in it now? ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: KenVan
Date Posted: July-05-2018 at 4:04pm
Yes; Interceptor. I understand about the USCG. They merely enforce regulations and it's the regulations that I might disagree with, but that is neither here nor there. Assume for the purpose of this forum that we're talking about a USCG approved system. I'm looking for a TBI. Several years ago, I looked at a system by Howell Engineering. It's a refurbished Chevy TBI, computer, harness, complete system. I didn't pull the trigger then because I suspected that better systems were on the horizon. FAST makes a slick throttle body that closely resembles a 4 bbl carb, but they do not currently offer a marine system with optional O2 sensor. A previous post just above here provided a link to Affordable Fuel Injection's website and they have a very reasonable kit/system. I think the hardest part of the install might be adding a return fuel line to the tank. USCG approval might end up being the determining factor. ------------- '68 CC Mustang, original owner |
Posted By: DayTony
Date Posted: July-05-2018 at 4:07pm
Fuel Injection, is certainly not going to accomplish this for you. Just ask anyone who has it. I dont think "turn key" every spring truly exists in the world of boating. There will always be maintenance and general work that will need to be done. Personally the closest you might get is a yamaha outboard. But even then if you think you're going to shut it off in november and fire it back up in april without a hiccup it may only work for a few consecutive years. If you're unable to do the work each season find a mechanic who can. You will probably break even as far as costs go vs going with a peiced together F.I. ------------- 1988 Barefoot nautique-454 |
Posted By: 8122pbrainard
Date Posted: July-05-2018 at 4:12pm
I agree. Ken, maybe we can help if you describe the problem you have in the springs? ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: KENO
Date Posted: July-05-2018 at 4:49pm
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Now as far as the USCG goes, there is the category of parts that have actually been tested and received the USCG "stamp of approval". They usually advertise that fact pretty prominently and have a sticker or tag on that piece of equipment that says it's approved. Then there are those companies that advertise that their piece of equipment meets USCG standards. They haven't got the "stamp of approval" though because they haven't undergone the expensive testing. But people use the stuff and the company lawyers must know it's OK if for example somebody blows themselves and a couple of passengers 20 ft into the air .because for example their non USCG approved, but meets the specs distributor caused an explosion. Everybody with a DUI marine distributor raise your hand now and say it "meets the specs, but it doesn't have that official stamp of approval" and tell KenVan how a marine AFI system is any different than your favorite distributor. I don't know the answer to the meets vs approved issue but I figure those lawyers for all these different companies aren't too worried about it for some reason. DUI is just an example, there are plenty of others selling marine stuff that "meets the spec" AFI advertises that it's marine and they go to boat shows selling it so they must have confidence in it's marine capabilities |
Posted By: Gary S
Date Posted: July-05-2018 at 5:46pm
https://www.ebay.com/itm/94-Volvo-Penta-5-0-302-V8-Fuel-Injected-Engine-Free-Shipping/132672974121?hash=item1ee3eced29:g:mLgAAOSw1ZpbK~vu" rel="nofollow - Here you go take off the parts you don't need, use your Interceptor mounts,bellhousing,exhaust,etc, get a PCM 1.23 trans to spin the prop the correct way and off you go! And it could be theoretically serviced by a Volvo Penta dealer  Knock on wood,for the last 5 seasons my 95 fires off after sitting for 6 months just like I ran it yesterday,but I think the carb'd ones would too if they used electric fuel pumps ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: 8122pbrainard
Date Posted: July-05-2018 at 6:16pm
After a layup, all it takes with a carb'd engine with a mechanical pump is a couple squirts of gas down the manifold and they fire up just like it ran yesterday too.  I always have one of these when I get an engine running come spring.  Sure does save me having to spend $1,500 on a FI system that's questionable with the USCG!  ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: gun-driver
Date Posted: July-05-2018 at 7:54pm
Gary I was going to say something but didn't want to side track the thread. Just a little over two weeks ago I fired up my '95 for the first time since last fall. Reinstalled the impeller, tightened the belts, added 10 gallons of fresh gas, hooked up the battery and I don't think the starter turned two times and she's alive!!!! |
Posted By: KenVan
Date Posted: July-05-2018 at 8:21pm
Wise words, generally speaking. But we've owned the boat since it was new (it's a 1968) and it has always been very reliable. It's a Correct Craft, right? I added electronic ignition in the 90's, and that has proven to be a good upgrade. My only issues recently have been with the fuel system, and in this era of ethanolized fuel. Ethanol is not friendly to these older systems. Since I can't get ethanol-free gas (at a reasonable cost), I want to modernize the fuel system to accommodate the fuel. I'm not necessarily looking for feedback from those who have a stock EFI boat, because I don't think those are great systems. I'm looking for feedback from those who have put aftermarket EFI on their motor. Do you have any experience with aftermarket EFI systems? ------------- '68 CC Mustang, original owner |
Posted By: 8122pbrainard
Date Posted: July-05-2018 at 8:41pm
Ken, I'm curious as to what problems are you having with the ethanol? I too run ethanol and have since they started making it. I have never had any problems with my 54, 64 or 77 and have done nothing to them. In all honesty, sometimes I feel people use the ethanol as an excuse to engine problems they can't diagnose. ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: Gary S
Date Posted: July-05-2018 at 10:23pm
 Here is my fuel injected boats label next to the filler,they really don't like alcohol either . Maybe it's more of a handling problem rather than a fuel type. Do you use any fuel stabilizer? If I could I would not use alcohol either but here we have no choice. ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: DVskier
Date Posted: July-05-2018 at 10:37pm
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Pete, I think the engineers at PCM have good reasons to suggest only using non ethanol fuels in all PCM engines. Most small engine manufacturers also do not recommend ethanol fuels. Specifically I own Honda and Stihl power equipment stating non ethanol fuel only. David |
Posted By: Gary S
Date Posted: July-05-2018 at 11:23pm
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I think PCM recommends it to cover their butts. Back in the late 80's they told you to use leaded gas in their engines too,when it had already been phased out in the automotive world. No one even worries about that anymore ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: DayTony
Date Posted: July-06-2018 at 2:22am
I do. And the point I think that's being tossed around here is that EFI may not suffer the SAME problems as a carburetor and a mechanical pump do. But they do tend to develop and suffer THEIR OWN special problems. Which tend to be very specific to each efi. Even the early efi sustems still run a mechanical AND an elec pump. Each generation runs different fuel pressures, some have diagnostic capabilities some do not. And when you do have problems and need help it can be hard to get support from both online searches as well as manufacturers. That said; if I was to convert my engine tomorrow I would not try and peice together a kit or swap from a different motor. I would go with a stand alone system that's programmable or I wouldnt go with anything. Carry a few spare O2 sensors and have fun. ------------- 1988 Barefoot nautique-454 |
Posted By: DayTony
Date Posted: July-06-2018 at 2:36am
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Also. For aftermarket efi I have only dealt with Howell and MoTec. But the systems I dealt with are probably long outdated now from what I've seen on the magazine pages lately. The motec could be custom mapped but it did not record pulls so we had to make notes and adjust it after. Today I believe most are self learning. And will record data for use while tuning. ------------- 1988 Barefoot nautique-454 |
Posted By: 8122pbrainard
Date Posted: July-06-2018 at 7:08am
Tony, Were these on marine engines? ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: uk1979
Date Posted: July-06-2018 at 7:47am
Don't worry pete Motec have it covered....fully polyurethane-potted versions of the M400, M600 and M800 ECUs  ------------- Lets have a go 56 Starflite 77 SN 78 SN 80 BFN |
Posted By: KENO
Date Posted: July-06-2018 at 8:58am
So Pete................KenVan came here looking for info on fuel injection systems, he got pointed towards AFI who happens to sell a marine system that just might work on his engine. It's no less "marine" than a DUI distributor AFI has been around for quite a while and sells good stuff. He wants a Fuel Injection system, he didn't come here to get talked out of it. Maybe you should tell him to ditch the Electronic ignition he put on it in the 90's cause it's "unreliable". Maybe you should get rid of your Electronic ignition while you're at it And........give him some credit for wanting to try this. |
Posted By: 8122pbrainard
Date Posted: July-06-2018 at 9:19am
Ken, Where are you getting the impression I'm trying to talk him out of trying a FI system? ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: KENO
Date Posted: July-06-2018 at 9:34am
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Posted By: SNobsessed
Date Posted: July-06-2018 at 9:56am
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Ken - Maybe you can find a bad (mechanically) FI marine engine & salvage the fuel system. Maybe put an adjustable pressure regulator on it t adjust for difference in displacement. ------------- “Beer is proof that God loves us and wants us to be happy.” Ben Franklin |
Posted By: DayTony
Date Posted: July-06-2018 at 10:11am
Sorry I meant to say these were on street vehicles, so obviously a little different but the idea is the same. I caution against factory ecm run systems unless it's a factory power, factory setup. Because tuning is not easy to accomplish, a stand alone "learning computer" will allow you feedback and easier tuneability. I have run into problems with the 500efi merc systems before and remapping nightmares. So that's where my worry comes from. So the question; is that old girl worth dropping the dime on the T1000's neural networking processor? That's not for us to decide. However if you go with a 302 based Efi I feel you may get a rich idle. Im not sure the power differences. But at least there is a good chance you will not lean her out.------------- 1988 Barefoot nautique-454 |
Posted By: 8122pbrainard
Date Posted: July-06-2018 at 10:13am
------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: KENO
Date Posted: July-06-2018 at 10:47am
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A little trip down memory lane Pete That squirt can sure does cure everything Did you rebuild it yet? http://www.correctcraftfan.com/forum/forum_posts.asp?TID=41205&title=another-4160-issue" rel="nofollow - link |
Posted By: phatsat67
Date Posted: July-06-2018 at 11:25am
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I too am interested about what issues you are seeing because of the carburetor? Also, a classic case of points are bad and EI is good. Points set up properly will run exactly the same as an EI conversion. |
Posted By: 8122pbrainard
Date Posted: July-06-2018 at 12:33pm
Ken, The rebuild wasn't needed. The engine runs great and the fuel transfer tube doesn't leak. ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: KenVan
Date Posted: July-06-2018 at 12:48pm
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Thank you all for the input, and please keep it coming! For the most part, it runs well. Maybe I should upgrade my fuel filtration because my problem is typically resolved by tearing down the carb, cleaning it out really well, and putting it all back. Any small particulate in an emulsifier tube, jet, fuel passage, etc., will cause performance issues. A good cleaning resolves it. But I don't want to do that anymore. Of course, I know I would need to include a quality filtration system with an EFI install because injectors can clog as well. I always have cold start issues and idling has been troublesome lately. The hand -held squirt can of gasoline might work for some of you, but if the accelerator pump on your carb is functioning properly, you shouldn't need a squirt can of gasoline. The accelerator pump does exactly that; it's a built-in squirt can! This motor used to idle at 450-500 rpm with no problem. Lately, it will stall below 800. That's not so nice during my evening put-put cruises around the lake. I've played with the idle circuit and timing, but I can't seem to find that old sweet spot. She's old, I know, and that's why I wanted to try something new. Aftermarket systems like AFI and Howell seem great because they are all self contained and I won't have to piece together a Frankenstein EFI. They will work with my current ignition also, but I would upgrade that if it was helpful. In fact, i was unaware of the Motec unit suggested above by UK1979 - I'll have to learn more about that. Another key aspect to some of these aftermarket systems is that they do not require an O2 sensor; it's optional. Although there is an ideal location in my exhaust that I could add an O2 sensor, I would try it without first. It does not surprise me to see the "no ethanol" warning label on your 1995 EFI system. Ethanolized fuel was not mandated back then and the fuel systems were not designed to handle ethanol. In New Jersey, it is illegal for gas stations to sell non-ethanolized fuel. I can buy non-ethanol fuel in 32 oz. containers at the auto parts store and the cost is astronomical. Can you imagine filling up your boat with one quart containers!!! All our small engines, in fact, like your weedwacker, lawn mower, snowblower, etc., do not like ethanol either. Ethanol sucks, but we are stuck with it for the time being. Overall, it sounds like none of you have made such a conversion to EFI on your boats. That makes me a pioneer in addition to a newby!!! Wish me luck. ------------- '68 CC Mustang, original owner |
Posted By: 8122pbrainard
Date Posted: July-06-2018 at 1:10pm
Ken, The majority here understand what the accelerator pump does but I feel you missed the point on the squirt can. It's used after a layup when there's no fuel in the carb
Yes, keep us informed on how the FI goes. ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: KenVan
Date Posted: July-06-2018 at 1:18pm
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Also; stabilizer products that some of you suggested above don't actually resolve the ethanol problem in our gasoline. They may help extend the fuel's lifetime while it's sitting in your tank, and I do use them myself, but they don't 'remove' ethanol and they don't stop the ethanol from damaging fuel system components. The ethanol is still there. Besides damaging fuel system components, the ethanol is hygroscopic; it loves to suck up moisture from the air. Like most of you, I use my boat in the water (I hope you're laughing), so there is plenty of moisture around for the fuel to suck in through your fuel tank vent. I don't know that this problem is avoidable in any way, regardless of additives, other than burning fuel as quick as you can. Lucky for us, burning fuel is fun! My understanding of how products like Stabil work, and I could be wrong, is that it slows down the absorption of water by the ethanol, but it cannot stop it. In the good ole days, you would fill your fuel tank to the top before storing it for the winter. Now, you should drain it completely. That's because of the ethanol and it's propensity to absorb moisture. Did I day ethanol sucks? ------------- '68 CC Mustang, original owner |
Posted By: TRBenj
Date Posted: July-06-2018 at 1:24pm
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Sounds like you may be well suited to being a pioneer on an aftermarket efi conversion... good for you. Let us know how it goes. I suspect the reason it hasn’t been done and documented here is because it seems like a fairly daunting task to get dialed in properly. I’d like to try it one day for other reasons, but expect there to be a learning curve. People who can’t keep a carb boat running properly may be equally poorly suited to pioneering a one-off marine efi system? Just a guess. Be aware that the symptoms you’re describing are NOT typical of carburetor issues, rather of fuel contamination issues- which will negatively affect efi in a similar fashion. You may be well served to service your fuel system end to end, from a good tank cleaning, fuel line replacement, fuel filter replacement and carb rebuild, to start. Then follow up with high quality fuel on a regular basis. Don’t underestimate the importance of that last part, I have noticed improved fuel longevity and easier starting once converting over to a local station that I suspect sells a higher volume of higher octane fuel... my old station sold it cheaper but gave me issues if the boat sat for more than a week. All E10 here also, no e-free options. My carb boats start and run great. |
Posted By: DVskier
Date Posted: July-06-2018 at 1:29pm
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Kenvan, I totally agree with your opinion of ethanol fuel. After purchasing numerous replacement power tools I now exclusively use non ethanol fuels for my boats and small engines. I just bought a 2018 Yamaha VMAX 115 hp engine for my pontoon and Yamaha also recommends avoiding ethanol fuels. i wish you success in your pursuit of an EFI system. |
Posted By: KENO
Date Posted: July-06-2018 at 1:33pm
Don't forget Pete, that little chunk of junk you dislodged is still in the carburetor somewhere just waiting to bite ya' when it's the least convenient time . It might even have found another little chunk and mated with it and then they had a family of little chunks and they're multiplying like little rabbits in there Glad to know the hack job worked...........for now Now how many years has that electronic ignition been working for you? |
Posted By: rebel skier
Date Posted: July-06-2018 at 2:25pm
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I don't get it. I rebuilt the carb of my other boat because it sat and was never used. Since I rebuilt it, I have put 600 hours on the boat. I use ethanol fuel because the non-ethanol places around me I would not even piss in their toilet. The clean, reputable gas stations sell gas with ethanol in it. The marinas only got non-ethanol fuel this year, so that was not an option. I have had 0 problems. My 85 Ski Nautique burns all fuel equally, with no discrimination. It doe snot seem to care about about octane or the addition of alcohol. Again, I avoid the gas stations that advertise 100% gas but look like crap preferring a shell or bp with ethanol mixed in. I just don't get why anyone has issues with an >= 80 percent gas mix. Maybe you should change gas stations. Also, good luck with the FI. Please document what all you do. ------------- Hotty Toddy lets go skiing! |
Posted By: phatsat67
Date Posted: July-06-2018 at 3:08pm
I agree with all of Tim's statements. Fuel contamination isn't a characteristic of a carburetor. Any contamination is going to happen within any fuel delivery system supplied by the offending fuel system. Happy clean fuel system will net no need to clean out a carburetor. If you are running an old fuel filter consider swapping out to a modern screw on part. |
Posted By: DayTony
Date Posted: July-06-2018 at 7:49pm
Ken I would love to see you do it and document it. One of the tricky tasks I think is going to be cleanly mounting your O2 sensors. I have thought long and hard about that because I would love to do it to mine. and have an idea if you want to be my Guinea pig. Send me a set of fresh unused risers and I'll try my ideas for O2 sensor modification out on you first.  ------------- 1988 Barefoot nautique-454 |
Posted By: Gary S
Date Posted: July-06-2018 at 8:51pm
Any particular color you'd like in fresh unused Interceptor risers  I personally just don't see going through all this work to end up with a throttle body system and that is probably the rub -alot of time,money and work for very little to no gain. I happen to be collecting parts for a FI conversion too,going a different route though  ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: SNobsessed
Date Posted: July-06-2018 at 8:52pm
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Ken - what is the compression on your engine? If not healthy, that could be a factor in your engine's poor idle performance. Also, what do you have the timing set at? ------------- “Beer is proof that God loves us and wants us to be happy.” Ben Franklin |
Posted By: DayTony
Date Posted: July-09-2018 at 6:04am
I do not discriminate. The pcm ones on my bfn offer a nice flat and large surface to modify and work with I'm not super familiar with the interceptor risers, or what they look like but it can certainly be explored. ------------- 1988 Barefoot nautique-454 |
Posted By: AlfaDon
Date Posted: July-12-2018 at 8:34am
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So much to reply to in this post I don’t know where to start. EFI conversion is literally the proverbial rabbit hole. Fast makes a system but it’s $2K. All the others aren’t certified. That said, all you really have to do is follow the USCG rules. It’s not brain surgery, just tedious. Little things like not putting the fuel pump in the tank, Buy a OMC or Penta 302 like somebody mentioned. Parts are scarce and nobody likes them but if you’re a Mustang fan you’ve already got the knowledge. Gary S- I see your collecting parts and raise you a Custom modified Edelbrock Manifold with BBK 70mm throttle body and a K&N Spark arrestor off a 502 Merc. 
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Posted By: KENO
Date Posted: July-12-2018 at 9:02am
Since you mention that the FAST system is USCG certified, can you show me something from FAST that documents this certification?
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Posted By: JoeinNY
Date Posted: July-12-2018 at 10:45am
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I have a carbed boat that generally runs great and always starts and runs and the carb hasn't been off in years - the holley black or blue electric fuel pumps however that I chose during the time I upgraded the engine past the point where a stock mechanical pump would feed it never seem to last more than 2 years - I would say that I have spent $1500-2000 on those over the past 10 years. Moral of the story is that sometimes its not the sexy part of the upgrade that costs you money in the long run. Actual fuel injection systems are generally much safer than any marine rated carb - some care has to be taken in supporting systems as mentioned above with the fuel pumps/lines and the ignition components but injectors/throttle bodies etc are much less likely to dump fuel into your bilge than a carb. Current fuel injected marine engines are 99% direct automotive content - just the support systems are designed by the marinizer. Those tend to be the parts that get to be expensive, hard to come by and are not tested and refined nearly as well as parts that have automotive volumes. As for marine rated - IMHO its like they say on the picture tubes as long as you know the rules and why they are there you can break them. Biggest issue for me and the fuel injection tends to be cost - for me to put in a couple k- I would definitely want a system with sensor feedback - ideally O2 and knock sensors and the ability to control the ignition curve as well as fuel delivery and even then I would only consider it on a boat that needed a new distributor and carb. 2k generally would be better spent on fancy cylinders heads(1st) or roller cams (2nd). Unless I was spending other peoples money then even a static mapped stand alone throttle body system would be a fine upgrade. you pays your money and you takes your choice - just be sure to post back here when you are done to tell us how it worked. ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1477 - 1983 Ski Nautique 2001 1967 Mustang 302 "Decoy" http://www.youtube.com/watch?v=cO5MkcBXBBs - Holeshot Video |