2001 jeep grand cherokee gas tank shield

If there is no power, there is an open in the harness to the pump from the fuse block. If there is power, the fuel pump took a dump and needs to be replaced.

Remember that there will be power for only 2 seconds, so have your helper cycle the key on and off as you check the terminals, allowing 5 seconds between cycling for the computer to reset.

Use a circuit tester and test the harness side for power as your helper turns the key on and off. It will be easy to find and has four wires in the connector. Unplug the fuel pump connector at the back of the fuel tank. To be absolutely sure, raise and support the back of the Jeep on jack stands, unless the height allows you to crawl under the back without raising it. It could be a sensor or computer-related problem. If not, the engine should be checked for spark. If it starts, the fuel pump is the problem. Spray some carburetor cleaner into the throttle body. Take off the air cleaner and hold the throttle plate open with your hand. If not, there is a bad wire under the fuse block to the battery it should have constant power at one terminal. Remove the relay and test the terminals that it was plugged into for power with the key off.

If there is no pressure, replace the cap and check the relay. Be ready to release the Schrader if there is fuel pressure, for it will come out fairly steady. If not, hold the Schrader in and have the helper turn the key on. Take a small screwdriver and push in on the Schrader to see if fuel comes out in force. If so, then look to see if fuel is the problem by removing the cap on the Schrader valve on the fuel rail on top of the injectors. Check to see if the fuse to the fuel pump is good. If the pump cannot be heard, then replace the cap and lift the hood. Have the helper turn on the key for 3 seconds and off for 5 seconds and on again a couple of times. The computer shuts the power off to the pump if it does not see a signal from the crankshaft sensor. The pump runs for only 2 seconds at a time when the engine is not running. Starting from the basics, take off the fuel cap and listen closely for the fuel pump to come on as a helper turns on the ignition key. If you feel that the fuel pump has failed, then this is the proper way of diagnosing the problem before replacing an item that may not be needed.

2001 jeep grand cherokee gas tank shield