pug Posted June 16, 2010 Share Posted June 16, 2010 What would it take to replace xj tank into a mj. I know the tanks are not the same will sending unit and fuel pump all work from a xj. Also does it have to be for the same size motor. thanks Link to comment Share on other sites More sharing options...
Automan2164 Posted June 16, 2010 Share Posted June 16, 2010 Sending units are not interchangeable, but you can put an XJ tank in to the MJ, if you just want to put it in the bed. It will not bolt up underneath, but a few members are just running XJ tanks up by the front of the bed. I believe that you have to match the pump to the engine... Renix 4.0, HO 4.0, 2.5L... Rob L. Link to comment Share on other sites More sharing options...
pug Posted June 16, 2010 Author Share Posted June 16, 2010 Would you know of hand how much bigger is the xj tank over the mj tank and would xj fit under the bed with some custom mounting brackets. thanks Link to comment Share on other sites More sharing options...
johnj92131 Posted June 16, 2010 Share Posted June 16, 2010 Is there something wrong with your Comanche gas tank? You can get a stock replacement tank for a reasonable price on Ebay. I have looked at this and I don't think it will fit under the bed. My truck is a long bed - they have a very large X brace at the back where the spare mounts and where I would want to put a Cherokee 20 gallon tank. But I did see a custom Comanche on Ebay that had a Cherokee tank mounted in the rear, below the bed as a second gas tank. There was a whole lot of work done on that truck. Your Comanche tank will have something between 13 gallons and 23.5 gallons. 23.5 was optional on all long beds and standard on long beds starting about 1990. You can identify the 23.5 gallon tank because it is held by 3 straps, not 2. Link to comment Share on other sites More sharing options...
Eagle Posted June 16, 2010 Share Posted June 16, 2010 Would you know of hand how much bigger is the xj tank over the mj tank and would xj fit under the bed with some custom mounting brackets. thanks They are completely different in size and shape. I very much doubt that an XJ tank would fit unless you hung it below the frame rails, which would be a VERY bad idea. Link to comment Share on other sites More sharing options...
pug Posted June 16, 2010 Author Share Posted June 16, 2010 Nothing is wrong with the gas tank. From what i have read on here it sounds like the sending unit that is the reason i wanted to know about the xj tank. I would use the sending unit to. Would the 2.5 tbi and 2.5 mpi be the same fuel pump. Thanks Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now