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We have a 1999 GMC Savana conversion van that has been giving up problems when we go to start it. It doesn’t start the first time you turn the key, but usually does the second time. Two years ago we had the fuel pump replaced and it seems that ever since then we’ve had this problem. The gas gauge needle will also shake and when you fill the tank full of gas the needle goes way beyond the full mark and when the needle gets to the red mark you’d better get gas SOON.
Any ideas on what this is? Could the fuel pump have been bad to start with?

Response:

It sounds to me that when the Fuel Pump was replaced that the intermediate wire harness that goes from the top of the sending unit to the pump was not replaced. This explains the gauge flux and the starting problems. Also, it will NOT show any Codes.  Time to drop the gas tank AGAIN.

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