BADASS of New England

An automobile club for the enthusiast who enjoys the last of the big GM cars. The rear wheel drive B and D bodys. Chevrolet Impala SS, Caprice, 9C1, Buick Roadmaster, Oldsmobile Custom Cruiser, Cadillac Fleetwood
 
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 Fuel pump issues

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GasTT

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Posts : 2675
Join date : 2009-01-19
Age : 29
Location : Treasure Coast, FL

PostSubject: 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

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Join date : 2009-11-10
Age : 33
Location : Connecticut

PostSubject: 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

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Posts : 2675
Join date : 2009-01-19
Age : 29
Location : Treasure Coast, FL

PostSubject: 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

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Join date : 2009-01-21
Age : 58
Location : So.Portland/ME

PostSubject: 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

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Posts : 2675
Join date : 2009-01-19
Age : 29
Location : Treasure Coast, FL

PostSubject: 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

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Join date : 2009-01-21
Age : 58
Location : So.Portland/ME

PostSubject: 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

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Posts : 2675
Join date : 2009-01-19
Age : 29
Location : Treasure Coast, FL

PostSubject: 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

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Join date : 2009-01-21
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Location : So.Portland/ME

PostSubject: 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

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Age : 33
Location : Connecticut

PostSubject: 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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