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I replaced the fuel pump in a 1995 Jeep Cherokee Sport without having to remove the gas tank. Maybe you can too in your '98 Grand Cher. If your fuel pump is accessed from the upper front of the gas tank-above the rear differential-then you should be able to remove the pump with the tank in place. It was easy on that jeep of my son's, took only about an hour or two.
The fuel pump is located in the fuel tank. Some vehicles have an access port under the rear seat or in the floor of the truck that can allow access to the fuel pump without removing the fuel tank. If your does not, you must remove the fuel tank to get to the fuel pump assembly.
The fuel pump is inside the fuel tank. Some vehicles have an access panel beneath the rear seat in order to replace the pump without dropping the fuel tank. If yours does, it is a simple plug and play repair. Simply remove the access panel, below will be the top of the pump with the electrical connection and fuel lines running to it, remove those, then unbolt the pump, remove, and reinstall is the reverse of removal. Hope that saves you a couple hundred $$$
Your model will require a fuel lock nut wrench to unlock the ring from the fuel pump assembly, which is located and mounted on/in the actual fuel containment tank. There should be an access door to remove the fuel pump and filter without actually lowering the fuel tank. The access door will be located just under the rear seat assembly, which will need to be raised or removed.
HI. This vehicle has a fuel pump access cover located inside the trunk, under the carpet overlay. Once you have removed the carpet; the cover can be seen in the center section of the trunk bed. There are 4 retaining nuts that are holding the cover on the access hole. Remove the nuts retaining the access cover in the trunk and lift up the cover. Once the cover is removed, the fuel pump will be exposed for maintenance or replacement.
The complete fuel pump module assembly in located inside your tank under the cover.
If you have a carburetor, you have a mechanical fuel pump on the engine. If you have a throttle body injection your pump is in the tank and the tank needs to be removed to get at it. Before dropping tank make sure the pump is getting power and a good ground.