Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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I have seen issues with poor ground for the fuel pump on this model as it attaches to the frame.I have had to re do the body and frame ground in the engine bay and clean and re do the pump ground on the frame for a better ground.The pump may run but it may not be supplying enough fuel pressure due to poor grounding in some cases.If this has not been checked into I would see if this resolves the fault here.
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Did you ever have the battery and alternator tested at all?
If you can have these tested this will hep to see if these are an issue in any way needing replaced.Let me know,thanks Pete.