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thedevan
New User
Jun 29, 2010, 6:44 AM
Post #1 of 4
(1700 views)
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Hello!
I am new to this forum and looking for some help regarding a possible fuel pump problem. I own a 2003 GMC Sonoma 4.3L vortec extended cab non-robust engine that just hit 220,00km. I was driving down a main road and the truck was running fine, has been for a while. All of a sudden my RPM hit zero and the truck stalled while the lights and everything were still on (no gas was going to the engine) So I had to get a tow home. The truck would turn over after but not start, didnt seem like fuel was getting to the engine so I disconnected the fuel line and manuelly poured gas into the engine while someone else started it, the car would rev until the gas stopped pouring then stall again. After that I decided to switch the fuel rely fuse with another one and the truck started for about 30 seconds and stalled, than I started it again and it started for 10 seconds and stalled, and than didnt start. So, while someone tried starting it i smacked the gas tank with a rubber mallet, and every time I did so the engine would rev until I stopped. This are clear indicators of the fuel pump, but the switching of the engine rely fuse kind of threw me off :/
And well.. since the average fuel pump Ive been dealing with over the years have been 90-150$, the one to replace my truck is 400-1000$!! So I was wondering if there was any way I could make 100% sure its my fuel pump before I go out and spend all that cash. Thanks!
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jun 29, 2010, 8:37 AM
Post #2 of 4
(1684 views)
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100% sure doesn't exist IMO. You get as close as you can though and should.
Check fuel pressure KOEO and while even primed and running for the few seconds. Check for injector pulse but I doubt that right now is the trouble.
Wiring connections where exposed usually underside near the pumps has been a problem for some.
With GM in particular I suggest going OE whole pump and gauge as a unit and pay the price or risk early failure that I hear of way too much with aftermarket cheaper stuff,
T
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 29, 2010, 8:37 AM
Post #3 of 4
(1682 views)
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Your mallet trick pretty much spelled it out. We use that trick often. If you want to be sure, test the power and ground arriving at the pump while monitoring a fuel pressure gauge. This is a high pressure system and it's very sensitive to pressure. It requires a minimum of 55 PSI to even run. Fuel pump failures are very common on that vehicle.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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re-tired
Veteran
/ Moderator
Jun 29, 2010, 8:41 AM
Post #4 of 4
(1679 views)
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Put a fuel pressure gauge on the fuel line and monitor pwr to the pump with a test light . If pressure goes to zip and pwr was good there's a high probability it's the pump. BTW have you changed the fuel filter ?
LIFE'S SHORT GO FISH
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