Pontiac Problems? Ask a Mechanic for Answers ASAP
Hi, I am Mike, welcome. I'm reviewing your question.
Replace that ground wire. You may be correct and the ground is weak. If you can disconnect the ground wire from the fuel pump or the tank, do that and when you remove the other end of the wire, from I suspect will be the frame or body, make sure you use a wire brush or sandpaper and clean the metal spot where the wire attaches, and use the same gauge wire. If you cannot just unhook the ground wire from the fuel pump or tank, then you may have to drain the fuel tank, lower it and remove and install a new pump if you still cannot unhook the ground wire.