Q: How do you remove the fuel pump/fuel level sending unit module on Buick LaCrosse?
A: To remove the fuel pump/fuel level sensor, start by relieving the system fuel pressure and equalizing tank pressure by removing the fuel filler cap. Then, disconnect the cable from the negative battery terminal and proceed to remove the Fuel Tank. Next, disconnect the electrical connector, fuel supply line, and EVAP hoses from the fuel pump/fuel level sensor, making sure to soak up any spilled fuel with a shop rag. Mark the orientation of the fuel pump in relation to the fuel tank for proper realignment during installation. Using large water pump pliers, unscrew the fuel pump/fuel level sensor locknut counterclockwise. If the locknut is tight, use a hammer and brass punch to loosen it, avoiding steel punches that could produce sparks. Carefully remove the pump assembly, being mindful not to damage the fuel level sensor float arm and float. Before installing the pump, remember to replace the O-ring. The installation process is the reverse of the removal steps.
Q: How do you remove the High Pressure Fuel Pump on Buick LaCrosse?
A: To remove the fuel pump, begin by relieving the fuel system pressure and disconnecting the negative battery terminal cable. Drain the cooling system and remove the thermostat housing. Disconnect the electrical connector and low-pressure fuel line from the pump. Use a wrench to unscrew the fuel line fittings from the pump and Fuel Rail.
A: The fuel pump check involves listening for the whirring sound made by the fuel pump when the ignition key is turned ON. If the pump does not come on, check the fuel pump fuse, relay, and wiring. If they all work, the fuel pump is likely defective. If the pump runs continuously, the PCM may be defective. Begin the engine and the gauge reading is compared to the proper pressure specifications. If the pressure is too low, there may be a faulty fuel inlet strainer or blockage in the fuel lines. If it is too high, replace the regulator. The key to the engine must be in the OFF position when checking the psi level. Any fuel leaks should be checked for and the system should be cleaned up.