| Fuel pump issues | |
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GasTT
Posts : 2675 Join date : 2009-01-19 Age : 36 Location : Treasure Coast, FL
| Subject: Fuel pump issues Mon Apr 16, 2012 11:22 pm | |
| My Caprice has been having fuel delivery issues. I can turn a wrench and I'm pretty handy under the hood, BUT, diagnostics are not my strong suit and I'd appreciate a little help from you guys.
Here are the symptoms.
- 99.9% of the time I get no self prime from the pump - after sitting a while the car will fire up - if I shut it off, sometimes it won't fire up again - sometimes motor stumbles with opening the throttle, in park
Facts
- fuel in the tank - pump runs using test lead - pump is brand new, just installed yesterday - trunk ground, and coil grounds are good - swapped PCM with known good and no change - swapped FP relay with known good and no change - FP fuse is good
Possibilities
- fuel pump wiring - oil pressure switch no good (guage pins when running, wiring diagram suggests the two are somehow linked)
What do you guys think?
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95brmw
Posts : 1434 Join date : 2009-11-10 Age : 39 Location : Connecticut
| Subject: Re: Fuel pump issues Mon Apr 16, 2012 11:38 pm | |
| Have you checked the pressure yet? Did you replace the hose from the pump to the top of the sending unit? Those things are known to crack. | |
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GasTT
Posts : 2675 Join date : 2009-01-19 Age : 36 Location : Treasure Coast, FL
| Subject: Re: Fuel pump issues Tue Apr 17, 2012 12:09 am | |
| Have not checked pressure yet. There is pressure at the valve in back of fuel rail.
When the car does run, the fuel pump stays on and it runs fine. | |
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M.ROSS
Posts : 443 Join date : 2009-01-21 Age : 64 Location : So.Portland/ME
| Subject: My experience Tue Apr 17, 2012 12:10 am | |
| I know nothing of the link to the oil pressure switch. But i do know that when i refurbed my fuel system. = New pump and good used sending unit , I tried to reuse old wirng and when installied it looked fine .But ended up with starting issues. New harness and it starts and runs fine now. | |
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GasTT
Posts : 2675 Join date : 2009-01-19 Age : 36 Location : Treasure Coast, FL
| Subject: Re: Fuel pump issues Tue Apr 17, 2012 12:13 am | |
| I did replace that hose and clamped it in place Dave. Thanks Mark. I just might get a new sending unit and upgraded harnesses. | |
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M.ROSS
Posts : 443 Join date : 2009-01-21 Age : 64 Location : So.Portland/ME
| Subject: Re: Fuel pump issues Tue Apr 17, 2012 12:31 am | |
| If your sending unit isn't too rusty etc .I'd reuse it .They're awfully expensive. I got lucky and found one from an SS with 10.000 miles that was being scrapped . Wirng harness is pretty cheap.Just make sure the connections are tight . | |
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GasTT
Posts : 2675 Join date : 2009-01-19 Age : 36 Location : Treasure Coast, FL
| Subject: Re: Fuel pump issues Tue Apr 17, 2012 12:34 am | |
| It is a bit rusty. But, it works. I found this topic on ISSF about rebuilding your sending unit. Might give it a shot. | |
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M.ROSS
Posts : 443 Join date : 2009-01-21 Age : 64 Location : So.Portland/ME
| Subject: Re: Fuel pump issues Tue Apr 17, 2012 12:43 am | |
| Yea that's a nice writeup. I love the part about using Ketchup to remove corrision .LOL I'm pretty sure my problem was the bulkhead connection. | |
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95brmw
Posts : 1434 Join date : 2009-11-10 Age : 39 Location : Connecticut
| Subject: Re: Fuel pump issues Tue Apr 17, 2012 7:40 am | |
| Start with soldering the connections as in that write up and see if that helps. Is it a delco pump? | |
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| Fuel pump issues | |
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