GM 13512935 Fuel Tank Fuel Pump Module Kit (W/O Fuel Level Sensor)

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Relieve the system fuel pressure. Disconnect the cable from the negative battery terminal. Remove the fuel tank. Clean the top of the fuel pump module. Disconnect the quick-connect fittings from the fuel pump module. Note the orientation of the pump mounting flange and mark the orientation of the fuel pump in relation to the fuel tank to ensure that the fuel pump is correctly realigned when you install it again. If you're going to install a new pump, note the location of your alignment mark on the old pump and make a mark at the same spot on the new unit. Using a pair of large water pump pliers, unscrew the fuel pump module lock ring by turning it counterclockwise. If the lock ring is tight or pliers will not work, use a hammer and a brass punch to loosen it. Remove the pump assembly, taking care not to damage the fuel level sensor float arm and float. Before installing the pump, inspect the O-ring for cracks, tears, and deterioration. If it isn't in perfect condition, replace it. The float arm may need to be installed onto the new fuel pump module. Note the installed position of the float arm on the old module and snap the float arm onto the new module in the same position. Insert the fuel pump/fuel level sensor module into the fuel tank, align the mark that you made on the fuel pump/fuel level sending unit flange with the mark you made on the tank, and carefully seat the pump flange on the tank. Make sure that you don't damage the float arm or the float during installation. If the float arm is bent, the fuel level that is indicated on the fuel level gauge on the instrument cluster will be incorrect. Remaining installation is reverse of removal.

To check the operation of the fuel pump, sit inside the vehicle with the windows closed and turn the ignition key to ON. Listen for a brief whirring sound made by the fuel pump as it pressurizes the fuel system. If you can't hear the pump, remove the fuel filler cap and have an assistant turn the ignition switch to ON while you listen for the sound. If the pump does not come on, check the fuel pump fuse(s) and relay, as well as the wiring back to the fuel pump. If these are all okay, the fuel pump is likely defective. If the pump runs continuously with the ignition key in the ON position, the PCM may be defective. To check the fuel pressure, relieve the fuel pressure and disconnect the quick connect fitting for the fuel feed hose. Connect a fuel pressure gauge using the proper fittings and cycle the ignition to run the fuel pump, checking for leaks. For 6.0L models, locate the fuel pressure test port, unscrew the cap, and connect a fuel pressure gauge. Start the engine and allow it to idle, noting the gauge reading once the pressure stabilizes. If the pressure is lower than specified, suspect a restricted fuel filter or check for kinks, blockages, and leaks in the fuel lines and hoses. If the pressure is higher than specified, the fuel pressure regulator may be stuck in the closed position. Drive the vehicle and monitor fuel pressure, checking for a restricted fuel filter and inspecting the fuel lines and hoses. Turn off the engine and verify that the fuel pressure does not drop more than the specified pressure for one minute. If pressure leaks down too quickly, check for a leaky check valve in the fuel pump or a leaking fuel injector. Finally, start the engine and verify that there are no fuel leaks.

The first step is to remove the engine covers.