There is only one fuel pump on that model. I'm in the middle of putting an lt1 in my 84 jag. The pump is towards the rear of the spare tier or closest to you when you open the trunk. There is also a small switching unit located next to it with lines running to either tank. This is what controls which tank the fuel is being pumped from
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this is a series 3 i presume, it has 2 fuel tanks 1 in each rear wing, the tank that you have switched to take fuel from using your dash switch is controlled by a y valve in the boot, the excess fuel has to be returned to the same tank that it has come from if one of these valves fail it remains open and all the unused fuel goes back the one with the faulty valve that tank full or not.the valves are easy to replace remove rear wheel and acess panel 4 screws and the valve is there but make sure you are replacing the correct side or replace both
Try tracing the fuel line from the gas tank to the fuel injection. If you are unable to find it then most likely the filter is located in the fuel tank with the fuel pump if equiped with an electronic fuel pump. Some fuel pumps are located in the tank, by the tank, or on the engine. either way if you trace the fuel line you should find it unless it is in the gas tank like I mentioned. Good Luck!
The filter is underneath where the passenger on the driver side would be. You may have an exterior pump between the filter and gas tank, if not its in the tank. If its in the tank its messy, a little dangerous but relatively easy. A mechanic would take take no more than 2 hours to do the in tank change and there would be no fires.... Basic tools are needed for both, well illustrated in the Haynes Manual. worth the 15.00
It sounds like a change over valve is faulty. U have 2 check over valves 1 on each side of rear wheel wells. Also a change over valve that switches 1 tank to other. I recomend replacing all 3 valves for peace of mind,because when 1 goes the others follow. Hope this is helpful!
i have a 92 xj6 i just replaced the fuel pump should be the same for yours remove spare tire in trunk there are two straps two bolts take bolts out jack car up there are locate your fuel filter mine was under the rear door drivers side follow the hoses and they will lead you to the two hoses connecting the gas tank there are two pins to remove one on each hose do not loose those trust me they will be hard to find and be aware there is very little space to work in after removing tank the rest is easy remove the pump located in the tank and do everything in reverse also dont forget to replace the screen to clean all the rust out of the tank there is a bolt in the bottom of the tank to let all the debris out good luck