Will this fuel pump work? |
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TRIP
Gold Member Joined: December-08-2007 Location: Costa Rica Status: Offline Points: 629 |
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Posted: October-16-2015 at 8:27pm |
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Ordered a new one and, of course, it's different from the original one.
Anyone know if this will fit and work correctly for my '85 with 351? |
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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That looks to be an automotive pump because of no diaphragm failure overflow hose connection
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TRIP
Gold Member Joined: December-08-2007 Location: Costa Rica Status: Offline Points: 629 |
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It is. Ordered while still on the lake yesterday. Getting a marine pump will cost me about $250 plus probably 2-3 weeks time to get here. I can return this if it won't work. |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Sander,
I feel you are going to have to face the $250 and get the proper pump. That pump you did get besides being non marine as Gary mentions, looks like it's for a newer engine with supply and return fuel connections. Where have you been getting your parts from being in South Africa? |
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lewy2001
Grand Poobah Joined: March-19-2008 Location: NSW Australia Status: Offline Points: 2234 |
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You can make it work temporarily..... You have to change out some fuel lines to rubber. Keep all the original hard fuel lines as is, so you can reuse them when the correct marine pump arrives.
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If you're going through hell, keep going
89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Sander,
What happened to your old pump? No pressure? Forgive me if you've already discussed the problem in another thread. |
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scootdogydog
Senior Member Joined: November-03-2013 Location: Central MA Status: Offline Points: 404 |
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Can't you have this one shipped to you for under $250 to your door?
fuel pump |
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TRIP
Gold Member Joined: December-08-2007 Location: Costa Rica Status: Offline Points: 629 |
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Thanks for the info guys!
Just recently I ordered the module for distributor and rotor. Cost $97, but $250 before I had it in my hands. Still sick of that so figured I'd try the one they had locally. Hoping to find someone who can bring the pump from the US now. Pete; at high rpm it starts stuttering, not enough fuel reaching carb, and sometimes engine shuts off. Carb seems OK. Not able to measure psi's, but mechanic was confident it's the fuel pump that's failing. |
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TRBenj
Grand Poobah Joined: June-29-2005 Location: NWCT Status: Offline Points: 21169 |
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Could be the pump... But I bet it's not.
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TRIP
Gold Member Joined: December-08-2007 Location: Costa Rica Status: Offline Points: 629 |
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I know... Just don't have the knowledge and/or tools to make a better diagnosis.
Anything you suggest I try before ordering the pump? |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Sander,
You mentioned you didn't have a way to measure the pump pressure but, all it takes is a plain mechanical gauge like you would find on a air compressor and then a T fitting. You must have some kind of industrial supply for the gauge? Go for a low psi scale like 0 to 15 psi. If all you can get is a gauge in bars' that's fine too and will just exercise our math! Is your mechanic guessing or did he actually see what pressure the pump is producing? Is the pump discharging any fuel to the flame arrestor via the safety (most are clear) tubing? |
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MrMcD
Grand Poobah Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3734 |
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I think fuel starvation has been diagnosed many times on here to be related to the fuel pick up at the tank. Others with experience can chip in but it seems to me there is a check valve at the tank that plugs or sticks causing engines to starve for gas..
Do you know that your fuel filter is good, has it been replaced? |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Mark, You must be thinking about the anti-siphon valve. It's not a true check valve but rather a USCG required device. In case of a leak in the fuel line from the tank, it prevents filling the bilge with gas. Yes, they do plug up. |
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Jonny Quest
Grand Poobah Joined: August-20-2013 Location: Utah--via Texas Status: Offline Points: 2957 |
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$250?
Try this one for $89 from skidim I would also look at a properly adjusted floats first. If your float is too low, you will starve for fuel at higher RPMs. JQ |
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2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
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TRIP
Gold Member Joined: December-08-2007 Location: Costa Rica Status: Offline Points: 629 |
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Borrowed a pressure meter today. It didn't do a thing, needle didn't leave "0". Must have done something wrong, though I can't imagine what. So that didn't help much. At all.
Pete, I didn't see any fuel going to the flame arrestor, though hard to tell cause tubing isn't that clear. Don't know what that indicates though? JohnnyQuest, after shipping and handling and duties, that $89 will be close to fore-mentioned amount I'm afraid. Thanks for the input guys! |
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 11050 |
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Hi Trip
Why don't you hook up a 5 gallon gas can temporarily, directly to the suction of the fuel pump and see how it runs? Use a piece of clear tubing and you can see if the pump is sucking from the can and runs good. If it doesn't suck, then it's probably pump related If it sucks and runs good, look at the anti siphon valve on the tank or the line from the tank to the pump or a filter if there's one on the suction side. Won't cost any outrageous shipping charges to check this stuff. KenO |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Sander, Do you remember what the scale was on the gauge? The fuel pump delivers around 6 Psi and the reason I suggested a 0 to 15 psi gauge. If the gauge has a higher scale, it would be hard to see any pressure. Not seeing any fuel going to the arrestor is good. On a marine pump if the diaphragm inside the pump develops a leak, fuel goes back to the carb instead of into the bilge or the engine crankcase. It's a USCG thing.
Kens idea isn't bad but only from the standpoint of if the engine "runs good". You will not be able to tell if the pump is bad or going bad from looking at fuel in a clear piece of tubing. You may see flow but at what pressure and difficult to detect the direction of flow. Besides leaks in pump diaphragms, there are also check valves inside the pump. If they plug up from say varnish, fuel will be pumped back and forth instead of just to the carb. Yes, "runs good" is what you really want but also you don't want to be stuck out in the middle of the lake! |
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juniorwoody
Gold Member Joined: August-09-2011 Location: Oak Hill, Fl Status: Offline Points: 937 |
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If the pump is working properly you shouls be able to take the fuel line to the carb off and fill a jar with gas while cranking. If it can't fill the jar it has problems.
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The value of money spent on new adventure far exceeds the value of money saved for the future
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 11050 |
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Maybe I should simplify this
Hook it to the can,use whatever tubing you want if the problem goes away, it's not the fuel pump. KenO |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Jack, Sorry but I don't agree. You are forgetting the pump pressure needs to overcome the needle and seat. The pressure won't be much but with the fuel line disconnected, the pump will not see this required pressure. |
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quinner
Grand Poobah Joined: October-12-2005 Location: Unknown Status: Offline Points: 5828 |
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Check/clean the anti-siphon first, cost's nothing but a little time
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1980nautique
Senior Member Joined: December-25-2012 Location: W.Massachusetts Status: Offline Points: 146 |
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All of the above checks and suggestions are proven to find the problem. Don't start throwing parts at the boat to find the issue!!!
If the fuel Pressure is 5-6 psi. at idle (650-700 rpms check it at rpm when the problem is occurring. I had a customer's boat act the same way. He brought it to every marina in the area and all of the fuel system components had been replaced, Once the boat was on plane the engine would cut-out and misfire. Fuel pressure at rpm would drop to 1 and then .5 psi. and stay there until the fuel fill was loosened. The problem was a spider nest in the tank vent screen!!! When fuel is pulled out of the tank by the pump air must get in to prevent creating vacuum in the tank. The pump cannot pull sufficient volume against a vacuum. It's worth a shot take a look at your tank vent from the outside, be sure it is clear of all debris!!! |
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TRIP
Gold Member Joined: December-08-2007 Location: Costa Rica Status: Offline Points: 629 |
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Thanks again everybody!
Think I'll have a chance to go to the boat tomorrow. Will check vent screen, but if that's clogged I'd also have problems when filling up the tank, 'cause air can't escape, right? And also I'll let the pump suck straight from a gas can. Pete, indeed the gauge that I had went to 50psi, so that' probably the reason the needle didn't move a bit. Tried to find another meter but only found one with even larger scale (100psi). Found a friend who's coming down to CR this weekend who will bring me a new pump. Might not be needed, then I'll just keep it as a spare, or maybe sell it. Figured I could get it now for $89. If I waited and it did turn out to be the pump it'd cost double to triple. Dying to figure out what it is. And to ride! Thanks again! |
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TRIP
Gold Member Joined: December-08-2007 Location: Costa Rica Status: Offline Points: 629 |
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The latest; checked the air vent, looked fine, blew in it and air came straight back.
Then disconnected fuel line at water separator and put it straight in gas can. Ran boat at WOT, and.... no problem whatsoever. Reconnected fuel line, ran boat at WOT, and... no problem whatsoever! So my best guess is that there was something stuck somewhere in the vent-hose and that I blew it lose. Hoping to run the boat tomorrow for a bit longer, so I'm very interested to see how it behaves! As usual, CCFan'ers were right. Let's hope the story ends here. Thanks folks! |
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TRIP
Gold Member Joined: December-08-2007 Location: Costa Rica Status: Offline Points: 629 |
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Problem persists.
Have only found pressure meters that read up to 100 psi or so. I'll keep looking for one. Or I might just change the pump to see if it solves the issue, since I have a new one anyway. How hard or easy is it to change it, for a not very mechanically inclined person like me (I'm always very pleased already when I managed to change the impeller or change oil, that level :p) To be continued.... |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Sander,
It's pretty much a bolt on install and as long as the pump is the same, you won't need to deal with rerouting fuel lines. |
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TRIP
Gold Member Joined: December-08-2007 Location: Costa Rica Status: Offline Points: 629 |
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Thanks Pete, sounds like even I can do it! Hope to put her in the water today. Started wetsanding/buffing as well though so let's see where it ends today. |
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TRIP
Gold Member Joined: December-08-2007 Location: Costa Rica Status: Offline Points: 629 |
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Well that wasn't too bad. Though it didn't fix the issue...
Happened again: after about a half hour of use, in a turn the engine starts running bad and almost dies. I leave it idling for a minute and we're good for 5 minutes or so, then happens again. Again idle a bit, go, then the same starts happening in straight line too. I cleaned out the tank, changed the in-line fuel filter, blew the air vent for the tank at the back of the boat. And changed fuel pump now. Looks like something is clogging up the fuel supply somewhere. But where?! If I take the pick-up out of the tank, do I need 4200 to put it back? Cause I don't have it atm (and can't get it within a couple hours' drive). |
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Hollywood
Moderator Group Joined: February-04-2004 Location: Twin Lakes, WI Status: Offline Points: 13513 |
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get a freakin' gauge already as i'm not even sure fuel is your problem...
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JoeinNY
Grand Poobah Joined: October-19-2005 Location: United States Status: Offline Points: 5698 |
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Yes it is at this point much more likely to be poor wiring to the dash causing excessive voltage drop than it is to be a fuel pump not pumping enough. Do the basics, voltage check, tune up, carb cleanout... all much more likely than a fuel pump issue.
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