why the eff does my fuel pump keep dying?!?!
09-10-2011, 09:42 AM
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why the eff does my fuel pump keep dying?!?! okay, this is on a 2002 chevy silverado, i am utterly confused on this one. last year, my fuel pump started giving tale tell signs that it was going to go out. a few months later, it did, and me and my dad put an aftermarket fuel pump on it, and it worked, until about 4 weeks ago, so we returned it at autozone and put another one in it. tuesday, it went out again, so i figured that airtex pumps sucked dick so we bought a delphi and got the money back on airtex. we put the new delphi pump in the truck, and drove it to take the airtex back the same day, and dammit, the fuel pump wouldnt prime and run. and that is exactly what happens, it will start cold, run for as long as it runs without shutting the engine off, but when you shut it off to go in somewhere, and go to start it back, the fuel pump won't kick in. so what could be causing, this? fuel pressure regulator or something else, please help me guys it is completely confusing me
09-11-2011, 04:21 PM
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if it was something with the wiring going to the pump, wouldnt it just stop working randomly. i mean, it runs fine and dandy, but when you shut it off, and it sets for about 5 minutes, it won't start back. i pulled off the pressure regulator off and gas sprayed out. so the fuel rails are still pressurized. i was thinking something that tells the injectors and fuel pump to run since the rails are full and pressurized.
09-12-2011, 07:55 AM
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The PCM triggers the prime cycle.
Then, at start, when the PCM sees a rpm signal, it turns the fp back on.
Because the rail sprayed fuel doesn't mean that the system is at the correct pressure. Put a fuel psi gauge on it, and see what's going on...
Then, at start, when the PCM sees a rpm signal, it turns the fp back on.
Because the rail sprayed fuel doesn't mean that the system is at the correct pressure. Put a fuel psi gauge on it, and see what's going on...
09-12-2011, 07:10 PM
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well, i think it was pressurized cus it sprayed out there like a ************! lol. the engine wouldnt even start and sputter and die so i know the fuel rails had a good bit of pressure. im going to get a haynes manual tomorrow and see if i can't fix this baby. parents thinkin of gettin a new truck and lettin me have the chevy so if i fix it, it's all mine 
. but anyways, the crank sends a signal for injectors and coils right? what all electrical things should i check, pcm, crank, fuel pump, maybe even the electrical center to?
. but anyways, the crank sends a signal for injectors and coils right? what all electrical things should i check, pcm, crank, fuel pump, maybe even the electrical center to? Trending Topics
09-14-2011, 07:24 PM
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shrink wrap i covered wires with i shrunk too much. ground wire became uncovered and wasnt getting a good ground i suppose. havent tried it out yet, but really think that was the deal because it wouldnt start until i respliced the wires and soldered em up. anyways, before doing anything else, if this happens to you, just check wiring on ur pump, guess i shoulda done that first but i thought it was just the pump because it would just do it intermittently
