68 Mustang fuel issue
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=47667
Printed Date: October-06-2024 at 6:27am
Topic: 68 Mustang fuel issue
Posted By: acusteroh1
Subject: 68 Mustang fuel issue
Date Posted: July-01-2019 at 4:13pm
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Hi folks, I’m attempting to fix my 68 mustang (289). I’m not getting fuel to the carb. I’ve changed the fuel pump, fuel line, and fuel filter. Still no fuel in the carb bowl, so I unhooked the fuel line at tank, stuck it in a gas can and I got fuel to the carb. So I’m thinking I have an issue at the rank. The line from the tank to the fuel pump is not clogged. Can anyone offer me any suggestions on how to proceed? On top of the tank, the fuel line attaches to what looks like a fuel filter but there are two wires attached to it. What is this? Sending unit? If so that is strange because there is no fuel gauge on the dash. It was quite hot after trying to start the engine several times. I thought about unscrewing this and by passing it to see if I could get fuel to move that way. Any help guidance will be greatly appreciated. Thanks, Adam I thought about unscrewing it and by passing |
Replies:
Posted By: GottaSki
Date Posted: July-01-2019 at 4:29pm
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Appears someone prior to you added a solenoid electric fuel pump as a band aid due to something else being amiss. they are useless in that configuration as they can only pull fuel up about 8". I suggest you remove it and tidy up the power leads carefully. Also make certain the tank and filler ground wires exist, and have continuity. I suspect the dip tube fittings at the tank are clogged in some manner, either antisiphon valve in the hose barb, and/or cone screen in dip tube; remove and disassemble the all the fittings and inspect internally ------------- "There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing." River Rat to Mole |
Posted By: acusteroh1
Date Posted: July-01-2019 at 4:51pm
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Awesome, I wondered if it was some sort of fuel pump. I’ll do as you suggest and give it a try. Another quick one: as I said I replaced the pump with one from retail auto parts chain. I read later that I should have used a marine style one w a glass bowl? I’m violating some federal regs? Thoughts on that? |
Posted By: GottaSki
Date Posted: July-01-2019 at 5:40pm
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Ok fuel bowl is not critical, however Your fuel pump on the engine best be marine, for the last 40 years or so visually identifiable by an additional outlet for some vinyl tubing to route the gas from a diaphragm failure safely into the carburetor behind the flame arrestor in some manner. Your 68 may not have had that originally, but unless you always boat alone, its not worth the risk playing with the lives of those who trust you to take best care of them. Your pressure side to the carb also has some fundamentals to follow for due diligence and responsible mechanics. Hard line or USCG approved soft line for pressure use and suggest redundant hose clamps ------------- "There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing." River Rat to Mole |
Posted By: 8122pbrainard
Date Posted: July-01-2019 at 5:53pm
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Adam, Tom above has some great advice concerning marine fuel pumps. http://www.correctcraftfan.com/forum/forum_posts.asp?TID=39335&title=mechanical-fuel-pump" rel="nofollow - Here's some good reading for more information on mechanical pumps. ------------- /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: acusteroh1
Date Posted: July-28-2019 at 1:43pm
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I finally got back around to looking into this issue more yesterday. I had to siphon 10+ gallons of fuel out of the tank. Removed the tank, sloshed around the little remaining fluid and emptied it completely. Then tank itself seems fine. I removed the solenoid fuel pump. The filler tube seems fine with no clogs. I think my original issue is that solenoid fuel failed. Hence, I replaced the fuel pump unnecessarily. Anyway, so my question is about the filler and tank ground wires. When I removed the tank, there was a negative lead attached to the tank, but not one attached to the filler cap. I'm assuming I just need to run a ground to the bottom of the filler cap? Thanks, for your help! -Adam |
Posted By: 8122pbrainard
Date Posted: July-28-2019 at 1:49pm
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Adam, Yes, it's a good practice to ground the metal deck fill too. Make sure the other end is grounded well to the engine block. A Ohm check would confirm this. What fuel pump did you replace? Another electric or the mechanical as recommended? ------------- /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: acusteroh1
Date Posted: July-28-2019 at 1:59pm
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Thanks so much for your help. I replaced the fuel pump with a mechanical one. However, it's just an auto one that I bought from a chain store. I'm going to track down a marine one and figure out how to run the bypass line to my carb. I'm positive I'll be asking for help with that task as well. The old pump did not have that line.. Thank you, Adam |
Posted By: KENO
Date Posted: July-28-2019 at 3:14pm
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Here's a link to one place where you can get a Carter M60389. Many places to choose from I should mention, there have been some bad versions of this pump that eat up the new diaphragm real quickly and then you get to return it for another one .  |
Posted By: 8122pbrainard
Date Posted: July-28-2019 at 3:36pm
Ken, You're slipping. Where's the link?  ------------- /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 < |
KENO wrote:Posted By: KENO
Date Posted: July-28-2019 at 4:02pm
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It's right here, I was just testing your sharpness today Pete Myself, I'm as sharp as a bowling ball today https://www.summitracing.com/parts/crt-m60389?seid=srese1&gclid=Cj0KCQjwj_XpBRCCARIsAItJiuSxkQ3345DKE8j43V_XGuUYUqZM4Nieu20ou_dc5Hdahp2H-Lttd6saAhDCEALw_wcB" rel="nofollow - link |