Fuel Pump, the same in the XJ and the MJ?

[Jason H. Rea]

So I got a local selling an MJ for a decent price. he claims the only problem is it needs a fuel pump. I have literally dozens of XJs in the local Pick-a-Part, but no MJs. Would the Fuel Pump from an XJ fit the MJ?

 

Did a quick search here and and others, but didn't find what I was looking for. Thanks

[kro10000]

The pump itself is the same, youll have to reuse the MJ hanger and components though

[mvusse]

:agree:

 

The pumps are the same, but the sender units are different. Make sure you get one for the correct engine, though.

[Jason H. Rea]

the truck I'm looking at is an 89. Do I need to get an 89 XJ Fuel Pump? or is there a range of years fromt he XJs that I can use?

[mvusse]

87 through 90. Make sure it's the same engine, as the 2.5l 4 cylinder and 4.0l 6 cylinder use different pumps.

[Unglar]

87 through 90.

 

Is that due to the Renix vs HO?

[JeepcoMJ]

the renix pumps are the same

 

 

H.O. pumps are different between mj and xj.

[kastein]

pump itself - lower pressure for 2.5 TBI on RENIX years, make sure you get the right one

 

mounting hangar/bracket/assembly thing - all sorts of different for various things, I forget, definitely different XJ vs MJ though. I know that the one I got from a friend for a 4.0/SWB/RENIX fit into my 4.0/SWB/OBD-I perfectly and works great except for the fuel level sender though, which works great but is backwards resistance wise so full means empty and empty means full.

[Unglar]

H.O. pumps are different between mj and xj.

 

If I have to replace my HO MJ pump, can the XJ be made to work? Or is the MJ pump still available?

[kastein]

The pump? yes... junkyards, ebay, auto stores, etc.

 

The pump assembly? Yes... well... sorta yes. It's on the shelf between the gold ingots and white whales. Fortunately the only way they really go bad is rust, so load yours up with something to prevent rust (without affecting serviceability) before it's too late! My new one is probably getting a heavy coating of grease or some sort of tar that I can dissolve off when I need to work on the pump again.

[JeepcoMJ]

H.O. pumps are different between mj and xj.

 

If I have to replace my HO MJ pump, can the XJ be made to work? Or is the MJ pump still available?

 

buy the mj pump.

 

 

sending units are NOT compatible.