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85 T/A WS6
Member
Joined: 18 Feb 2004
Posts: 539
Location: Buckley
1985 Pontiac Trans Am
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 Posted: Fri Sep 23, 2011 4:10 pm Post subject: Stumped and Mystified |
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Why would a fuel pump deleiver pressure for infinity at idle then when you drive it is slowly quits?
Been battling this for too long now. Thought I had it fixed 
I installed a ACDelco 19179597 pump in 11-09.
ever since then I have had issues. Starts up fine, runs great, then drive it for a few miles then it dies a slow death.
I dont drive my car anywhere, it has dick for miles.
new items since pump install:
coil, cap, rotor, plugs, wires, filter, regulator, pump relay.
The new regulator was installed and tuned with a fuel pressure gauge at recommended settings.
WTH?
_________________
1985 Trans Am Recaro Option (AS5)
67,000 miles 5.0 TPI Hi Flow MAF
TPI Airfoil w/Bypass Flowmaster WS6 (.92g)
3:27 Borg Warner Posi K&N Filtration |
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Dewey316
The Lama
Joined: 08 Jan 2004
Posts: 7295
Location: Bringing the tech
1990 Chevrolet Camaro RS
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| Posted: Fri Sep 23, 2011 6:24 pm Post subject: |
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| small internal leak where the pump connects to the output tube. Mine did more than a slow death when that happened, but it didn't want to build pressure right. Maybe run the pump (short the relay so it runs) and watch voltage at the pump for a while. |
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85 T/A WS6
Member
Joined: 18 Feb 2004
Posts: 539
Location: Buckley
1985 Pontiac Trans Am
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| Posted: Sat Sep 24, 2011 10:28 am Post subject: |
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When it acts up it just quits pumping. I can start it this AM and it will rub fine.
_________________
1985 Trans Am Recaro Option (AS5)
67,000 miles 5.0 TPI Hi Flow MAF
TPI Airfoil w/Bypass Flowmaster WS6 (.92g)
3:27 Borg Warner Posi K&N Filtration |
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aaron_sK
Member
Joined: 23 Jan 2006
Posts: 8834
Location: Back in beautiful Tacompton
1987 Chevrolet Camaro IROC-Z
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| Posted: Sat Sep 24, 2011 10:44 am Post subject: |
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| How is the harness going to the pump relay? I have seen many of them pull out of the connector. |
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chevymad
Master B
Joined: 11 Jan 2004
Posts: 5476
1987 Pontiac Formula
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| Posted: Sat Sep 24, 2011 10:52 am Post subject: |
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| Check for power and ground at the tank when the problem occurs. If you have it there's not much else it could be. Because somethings new definatly doesnt mean its any good. I change new parts all the time. |
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BluFbdy
Member
Joined: 16 Jul 2010
Posts: 915
Location: Port Orchard WA
1989 Chevrolet Camaro RS
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| Posted: Sun Sep 25, 2011 12:13 pm Post subject: |
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| chevymad wrote: | | Check for power and ground at the tank when the problem occurs. If you have it there's not much else it could be. Because somethings new definatly doesnt mean its any good. I change new parts all the time. |
Thats all too true lol id follow his advice and check for power and ground when the problem occurs if its got those its the pump, or the line. I installed my walboro pump and never swapped the line out and it had a minor tear I couldnt see until the line pressurized, it caused the pump to run at max constantly just cycling fuel in the tank with.minimal running to the front.
Keep in mind if your pump is running at max theyve only got a certain run life not sure what it is but say for example your pump is just running and running for x numver of hours, it could burn through its useful life and begin to fail I had a similar issue with my original pump it would run fine then crap out within a few miles swapped it for a delco pump, pump was bad out of the box and had to swap it again
Two lessons packed in one lol PITA to diagnose
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If you expect a kick to the balls and get a slap to the face its still a victory
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