1993 GMC K3500 Sierra SLX 8 Cyl 6.5L
fuel problems keeping up with injecter pump
have fuel in tank but in line fuel pump will not keep up with main fuel pump . I have changed fuel filter hoping this would help but it only runnes for little while . i have the pump on a bypass switch and it pumps fuel but it keeps running out of fuel on the hiway. I have tested every thing that I can without putting a new pump or dropping the tank.
Nissan Technical Advisor 1/25/2011
Did you check fuel pump pressure already? Also the fuel pump relay might be defective and providing an intermittent electrical flow to the fuel pump thus making it run on and off.