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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

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Old Mar 25, 2010 | 04:49 PM
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Unhappy help help help!!!!
Ok I just replaced the fuel pump last week due to this problem. The problem is I get in my car put the key in the ignition and my fuel gauge shoots WAY! Past full and my fuel pump won't turn on thus stopping me from starting my car. A few hours later it will be fine and return to normal. What could this be??
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Old Mar 26, 2010 | 02:31 AM
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Originally Posted by Lgoldtop
Ok I just replaced the fuel pump last week due to this problem. The problem is I get in my car put the key in the ignition and my fuel gauge shoots WAY! Past full and my fuel pump won't turn on thus stopping me from starting my car. A few hours later it will be fine and return to normal. What could this be??
it could be the regulator or filter
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Old Mar 26, 2010 | 09:00 AM
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Originally Posted by Lgoldtop
Ok I just replaced the fuel pump last week due to this problem. The problem is I get in my car put the key in the ignition and my fuel gauge shoots WAY! Past full and my fuel pump won't turn on thus stopping me from starting my car. A few hours later it will be fine and return to normal. What could this be??
I know what this is I went through this myself. The fuel gauge operates off of a potentiometer in the tank. (Varying resistance as the little plunger goes up and down with fuel level) If your ground goes bad going to the tank or in the tank the pump will not turn on and your fuel gauge will peg becuase the resistance signal going to the computer pegs due to the open circuit. Theres three wires going in the tank, black grey and purple. Im willing to bet the black wire either is cut somewhere or broke somewhere. On mine the little yellow bulkead fitting went bad on the top of the sender. I just ripped out my pump and went external cause the little 255 wouldn't keep up anyway. But yea you can either just by a new sending unit or fix the wiring. I guarantee this is your problem.
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Old Mar 26, 2010 | 10:52 AM
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^^Same thing I was going to say..the ground side of the circuit is messed up..prob a loose connection.
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Old Mar 29, 2010 | 03:11 PM
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i just got it back from the dealer since i already took down the tank once i didnt feel like doing it again. it turned out to be a bad fuel pump ground wire inside the tank. how the hell does a ground go bad inside a tank????
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Old Mar 29, 2010 | 04:57 PM
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Originally Posted by Lgoldtop
i just got it back from the dealer since i already took down the tank once i didnt feel like doing it again. it turned out to be a bad fuel pump ground wire inside the tank. how the hell does a ground go bad inside a tank????
It's very possible you bumped it loose when you removed it. The fuel pump assembly is fairly fragile.
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Old Mar 29, 2010 | 07:05 PM
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Ok not trying to jack your thread but my car wont start? I have spark good battery but not turning on can u hear the fuel pump come on because i dont know?! My fuel pump could be the problem but where is it in the tank or is there a place to pull it up?
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Old Mar 29, 2010 | 07:38 PM
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Old Mar 29, 2010 | 07:42 PM
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Do the trap door! I did it and I was so happy I did when the car didn't run after I put the new pump in and I found out it blew the line off inside the tank
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Old Mar 29, 2010 | 07:55 PM
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From: evil john tejas
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Originally Posted by bigj2717
Do the trap door! I did it and I was so happy I did when the car didn't run after I put the new pump in and I found out it blew the line off inside the tank
imagine if you dropped the tank only for that to happen... i wouldve been furious if that happened to me, lol

x10000000000 for the trap door
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Old Mar 30, 2010 | 12:31 AM
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I had to go back in mine to adjust the Float after my Walbro install..it was hanging up on something. Trap Door FTW.
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