A: Detach the cable from the negative battery terminal. Relieve the fuel system pressure. Remove the Fuel Tank from the vehicle. For 2004 and later models, disconnect the EVAP hose quick-connect fitting on the top of the secondary fuel tank module. Mark the position of the lock ring. Use a large pair of water pump pliers to remove the fuel tank module lock ring. If it won't break loose, tap it with a hammer and a brass punch to avoid sparks. Disconnect electrical connector from the unit, then push down on the tab near the base of the module to release the suction port tube, then carefully pull the module out of the tank. Inspect the 0-ring and replace it if it shows any sign of deterioration. Installation is the reverse of removal. For all other fuel tank modules, disconnect all the electrical connectors from the module and pressure sensor. Use a large pair of water pump pliers to remove the fuel tank module lock ring. If it won't break loose, tap it with a hammer and a brass punch to avoid sparks. Release the lines from the top of the fuel tank. Carefully remove the module from the fuel tank. Inspect the 0-ring and replace it if it shows any sign of deterioration. Installation is the reverse of removal.
Q: What does the fuel pump operation check involve?
A: Fuel pump operation check consists of listening for the sound of the fuel pump when the ignition key is turned to the ON position. Turning on the fuel pump fuse in case it doesn't come on, examining the condition of relay and wiring are ways to check this. In case all these are right, either the fuel pump may be defective or PCM can be faulty. To test the fuel pressure one could use a gauge that connects to Schrader valve test port found on Fuel Rail. The fuel pressure must be within specifications; if not, it indicates that probably there is a clogged filter, some blockage in the system or perhaps a bad fuel pump module. The engine should lose no more than 8 psi during 5 minutes after being turned off, anything more could mean that there is a leaky injector, leakage from a fuel line or in fact an incorrect functioning check valve in the fuel pump module. Lastly, always ensure there are no gas leaks before starting the engine.