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5.7 chevy 3500 fuel issue
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degoman
Novice
Sep 7, 2011, 8:04 AM
Post #1 of 9
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5.7 chevy 3500 fuel issue
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1997 chevy 3500 2wd single axle crew cab 350ci 300000mi. I replaced the fuel pump on sunday. drove the truck all day tuesday and it died on the way home. I check the fuel pump and can hear it pumping. check the new fuel filter and the arrow is pointing toward the engine, depressed the needle valve and have pressure when I turned the key. poured gas in the intake and I have fire. What am I missing. Thanks for your help
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Hammer Time
Ultimate Carjunky
/ Moderator
Sep 7, 2011, 8:19 AM
Post #2 of 9
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Re: 5.7 chevy 3500 fuel issue
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You're missing the exact fuel pressure. You need to use a gauge to test pressure. Merely seeing pressure at the port is not enough. This engine requires a minimum of 55 PSI to run.
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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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degoman
Novice
Sep 7, 2011, 5:42 PM
Post #3 of 9
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Re: 5.7 chevy 3500 fuel issue
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I will go to auto zone tomorrow and rent the pressure tester and get that info. Thanks
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degoman
Novice
Sep 9, 2011, 4:51 PM
Post #4 of 9
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Re: 5.7 chevy 3500 fuel issue
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50 psi
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Hammer Time
Ultimate Carjunky
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Sep 9, 2011, 5:08 PM
Post #5 of 9
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Re: 5.7 chevy 3500 fuel issue
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There's your problem. You don't have enough fuel pressure.
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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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degoman
Novice
Sep 10, 2011, 5:25 AM
Post #6 of 9
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Re: 5.7 chevy 3500 fuel issue
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any suggestions what to look for or should I just try another fuel pump?? I have not seen any signs of fuel leaking. Thanks
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Hammer Time
Ultimate Carjunky
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Sep 10, 2011, 5:41 AM
Post #7 of 9
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Re: 5.7 chevy 3500 fuel issue
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You need todiagnose it to find out what is causing it. Find a section of rubber line on the return side and pinch it off and see if the pressure spikes up. If it does, the regulator is bad, if not, the pump is bad. Double check the contacts at the plug going into the tank and into the pump. There is a known problem with weak contacts there.
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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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degoman
Novice
Sep 11, 2011, 7:03 PM
Post #8 of 9
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Re: 5.7 chevy 3500 fuel issue
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I pinched the line and still had 50 psi. I put the pressure tester inline behind the filter still 50psi. I dropped the tank and pulled the pump and low and behold it came off of the bracket and every time the pump twist it was pulling itself off of the 2inch hose it was attached to and was almost off when I pulled it out. Put it back together and all is good. Thanks for all of your help. This is a great service you all have here at CarJunky.com and even though I do not enjoy working on cars like I did when I was younger. It is great to know there is a resource like CarJunky.com to help when I need it.  Thanks again HammerTime.
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Hammer Time
Ultimate Carjunky
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Sep 11, 2011, 7:06 PM
Post #9 of 9
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Re: 5.7 chevy 3500 fuel issue
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You're welcome. Glad you got it resolved.
PS: I hope you put some clamps on that hose.
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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.
(This post was edited by Hammer Time on Sep 11, 2011, 7:07 PM)
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