has anyone had problems with the fuel pump wiring harness?i replaced the 4-wire harness when i installed a new pump...well that was 2-months ago...my gauge started jumping
back and forth just last week e-f...never reads correct...I'm thinking the other is bad...99 bazer

 

Check your connections. It doesn't take much corrosion to screw up the wiring. Did you shrink wrap the connections? If not, that may be your problem.