A worn pump bearing, failed pressure relief valve, leaking check valve and other inoperative fuel pump components can abnormally increase or decrease fuel pressure on the system. Either way, you will need to change the pump to restore engine performance. Here we will follow the necessary steps to replace the fuel electric pump based on a 2004 V6 2.7L engine, which is similar to other models.
Relieve the fuel pressure system. Remove the gas filler cap and start the engine. Let the engine idle while removing the fuel pump relay or fuse from the fuse box. Wait a few seconds until the engine stalls, then crank the engine for about 3 seconds to relieve the remaining pressure from the system.