How do you replace fuel pump on a 1996 Isuzu Trooper 3.2L?

Answer 1

First, check that your problem really is the pump. Check the fuel pump fuse. Take apart the electrical connection that leads to the pump. It's in the rear of the vehicle by the pump (pump is located in your fuel tank). Put your volt meter leads to the correct leads coming from the front of the car and have a helper turn the car on, but do not start it. The voltage should go up, and then turn off after a few seconds ( when the fuel system is pressured up). If this does not happen, it's probably the relay. If this does happen, reconect the wires near the tank, pull the relay and jump the connectors that go to the pump. Walk to the rear and listen to hear if the pump goes on. If it does, it's not the pump.

To change out the fuel pump is a big job. Relieve the fuel pressure. Disconnect the battery negative terminal. Drain the fuel tank. Disconnect the wires that go to the pump, the fuel filler hose, the wires that go to the fuel level sensor, the fuel pressure release hoses. Disconnect the fuel lines. Drop the tank ( get a friend to help you is the best way ). Undo the little bolts holding down the round cap that is connected to the fuel pump housing and pull it straight out. disconnect the old pump and reconnect the new one. Clean all surfaces and put the new gasket in place ( not a bad idea to dump out any remaining fuel and add a little new fuel and rinse it out). Re install the fuel pump holder with the new fuel pump and torque those little bolts to the specs in your manual. Then put the tank back in place and reconnect everything to it- double check your connections. Put some fuel in the tank and reconnect the negative cable on your battery.

PS; i hope it's your relay