I have a 2000 Chevy Blazer 4wd V6 Vortec, I bought this vehical from a used car dealer and they had to replace the fuel pump. Ever since they replaced that, the fuel gauge has been jumping from empty to full.

When I turn the vehical off and get out the fuel gauge jumps up to 3/4 but then jumps down to empty when I open any of the doors, and then jumps back up after I close the doors. While I am in the vehical with it turned off, I could go to adjust the power seats it jumps from 3/4 back down to empty.


If anyone knows what is causing this please let me know I don't want to start on taking anything apart untill I could pin point the cause.


Thank you