Is it VATS?
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Is it VATS? After replacing lifters and fuel pump 02 WS6 will not start. Replaced fuel pump relay and ignition relay, all other fuses good. Fuel gauge won't work but all others do as vehicle will crank but not start. Does the VATS prevent the fuel pump from engaging? Thanks
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The fuel gauge not working tells you there's a problem with the sender and thus likely a problem with the pump as well. IIRC, the car does not turn over with a VATS issue.
Tell us about your fuel pump install. Did you use a new GM pump/sender unit?
Tell us about your fuel pump install. Did you use a new GM pump/sender unit?
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It was cranking with no fuel gauge reading or pressure so i thought it would be the fuel pump. Replaced it with a Precision fuel pump from oreillys and still have the same issue as before. Replaced fuel pump relay and ignition relay. Other than bypassing the vats im out of ideas.
Have you checked to make sure ground wire is secure? I can't remember exactly where fuel pump ground is on the F-body, but I had a similar issue on a C5 Vette, engine would crank but would not fire and no pressure at the fuel rail. The problem was the fuel pump ground near the left rear wheel-well was not tightly secure. I tightened the ground wire and problem solved.
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Jump it with a wire? I have no idea what that means. I have little electrical knowledge.
Also make sure to check the ground is secure if not done already.
Last edited by R6cowboy; Jan 12, 2017 at 08:08 AM.
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Pull out the relay. Find the 2 slots where power comes in/goes out. Take a short piece of wire (thick enough to run a fuel pump), and strip both ends and jump those terminals. You'll be bypassing the relay/PCM and sending power straight to the pump. If it doesn't come on, then you have a problem with the pump or its wiring. Since your gas gauge doesn't work properly I'm going to assume its a ground.
If the pump DOES kick on, its either a bad relay, or the PCM not turning the pump on.