Join Date: Sep 2003
Location: Northern VA, USA
I would not trust a twelve year old Jeep fuel pump!
Most of the relays in the Power Distribution Center, located behind the battery, are the same; so you can play musical chairs/relays with them first to eliminate a relay. You also measure the fuel pressure at the fuel rail if you have a gage. Turn the key is listen for the relay and the pump whining.
You can also disconnect the harness at the gas tank. Measure the resistance across the pump and check to see if battery is getting to the pump.
My fuel pump quit the winter of 2004, in my 94 ZJ. I had to hacksaw the gas tank hanger bolts off, because NJ spreads a lot of salt on the roads. I paid $ 309 for the pump at a local parts store.
1- Test the hanger nuts for removal. If they need to be sawed off due to rust from winter salt, then buy two new bolts & nuts first at the Dealer before proceeding.
2- Hand-pump the gas out of the tank.
3- Jack the rear up a little for better access when dropping the tank
4- Disconnect the gas fill & vent line from under the rear driverís side fender.
5- Support bottom of gas tank with a jack
6- Remove gas tank hanger bolts. I used a hacksaw blade in my hand with a glove. There is no room to saw with the hacksaw blade in its frame/holder.
7- Disconnect electrical harness.
8- Remove the three gas lines going to the tank near the filter, because you do not want any gas vapors while sawing the hanger bolts. Drop tank, remove crappy pump & completely wipe in inwards out with several rags & use some gas to clean it even more. Spend as much time as it takes to clean the tank. Very important.
94 Black Laredo 4-Liter with QuadraTrac (42RE trans & NP249 TC) 200,000 + miles purchased new
88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new