GM Repair Problems? Ask GM Repair Expert Now.
Welcome. I am Cam. Can you tell me your first name please? Also can you tell me the 8th digit of your VIN?
When it was running, did you have any warnings on the dash? Any repairs before all this?
Fuel pump is possible, but why the battery is going dead does not fit with a fuel pump but lets see. Do you have a fuel pressure gauge?
Ok, what does the fuel pump sound like in the tank? Is it a quiet even electric motor noise or does it seem very high pitched or erratic when its running?
IF the pump is not an issue then it may be a connection, something in the underhood fuse block. Ground wires such as the ones under the drivers door on the frame. That is the ground for the fuel pump.. But for the pump we can check that with the pressure gauge. There is a test port on the passengers side of the intake manifold. Spec is 55-62 psi while its running and hold that pressure for 5 mins. If it drops fast or does not meet that spec then we are indeed looking at a bad fuel pump assembly.
That still could be the pump, in gear changes the load on the engine. Otherwise we are looking at a connection still. Grounds located on the back of the left cylinder head, top back of the block, front of the right cylinder head, block down on the sides could be loose as well. Until you get a gauge, move the wiring around to see if you can recreate the issue. Also check the duct from the engine to the air filter. If that was loose and coming off it would also cause this.
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