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Showing results for tags 'fuel pump replaced'.
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Just installed a new fuel pump in my 2007 5.3L Cuad Cab Sierra SLE Z71 Gas Only New Body Style VIN M, the pressure starts off at 70 psi for a few seconds then drops to 60-65 psi and stays there for a few moments then abruptly drops to 50 psi and spikes right after back up to 70 psi where is stays for a few seconds then drops to 60-65psi where it stays for a few moments then does the drop to 50 and spikes to 70. It keeps doing this cycle over and over. Does anyone have any ideas on the culprit. BTW, having the fuel pump replaced under warranty just in case its defective.