Boost Your Engine's Performance Fixing Injection Pump Pumping Issues

Bleed the fuel system per the manual - if you have one. If the pump is indeed bad it can probably be rebuilt. A local shop was able to rebuild ... Verify the air filter is new. Try advancing the pump on high-hour machines. If the problem doesn't change, then verify supply and fuel quality. If that is good, ... Brand new fuel pump assembly and the pump won't turn on, checked with the fuel line disconnected and no fuel pressure. Everything else works fine. Most likely your injector lines are empty and your starting aids are not working. Remove the spark plugs. Loosen the injector lines at the injectors. 1999 - 2006 (GMT800) - 03 silverado 2nd brand new fuel pump not pumping fuel - I changed out old pump with a new one and it would turn on ... Pull the return line off top of pump and make sure you're getting fuel out. If there's clean fuel there, loosen the nut on one of the injection ... Try pulling the wire connector apart and test the leads, there will be an orange and black (the 2 thicker wires) wires to the pump. Make sure ... Try disconnecting the outlet hose to the hard pipe. Run the rubber hose to a bucket or gas can. Turn on the car, and see if it pumps. You could have good fuel ... You have moisture, trash, dirt, or some other contaminant in your fuel. That same fuel problem will also ruin the new pump. Moisture in the fuel ... The fuel pump is turned on by the computer (ECM), so if the battery is low, the ECM might not turn the fuel pump on.