gte636p Posted May 10, 2019 Share Posted May 10, 2019 I let my MJ sit for a few weeks and my noise fuel pump has decided to stop making noise. Unfortunately, I am also only around my MJ for two or three days a month, otherwise I'm in a different state and cannot troubleshoot / repair things cheaply. This weekend I have the prompt sound when turning the ignition to run, nothing after that. Pressure at the rail doesn't really move the needle (maybe 5 lbs pressure) and there is gas at the Schrader valve, but not a mist... it's more of a fountain coming out. The battery pushing everything is charged and ready to go as well. Eventually the motor will "catch" and stumble a few times, only to die ~1-2s later. Hopefully it's just the hose in the tank leaking and not building pressure, but I'm trying to prepare for worst case scenario in that I have to mess with the sending unit. With all that background, here's my question: Is there a write-up / guide on how to take a new XJ sending unit and make it actually fit properly in a comanche. Barring that, are there pictures and dimensions on what the actual MJ fuel pump should look like? Just in case it makes a difference... this is on an '89 with a '92 HO swap (motor, computer, fuse block, etc...). Link to comment Share on other sites More sharing options...
13 Legion Posted May 11, 2019 Share Posted May 11, 2019 Found this in the archives. Since you haven’t received a response maybe this will help you out! Good luck Link to comment Share on other sites More sharing options...
TexanEliminator Posted May 21, 2019 Share Posted May 21, 2019 I just ordered a fuel tank without the pan in it from autozone along with an xj sending unit from my year. Fit in the tank perfectly and I’ve put 16.5 gallons in it. It is a little shorter than the mj sending unit but 16.5 gallons out of 18.5 is close enough to empty for me. Gas gauge works perfect too! $150 shipped to my door. Link to comment Share on other sites More sharing options...
benjy_26 Posted May 21, 2019 Share Posted May 21, 2019 22 hours ago, TexanEliminator said: I just ordered a fuel tank without the pan in it from autozone along with an xj sending unit from my year. Fit in the tank perfectly and I’ve put 16.5 gallons in it. It is a little shorter than the mj sending unit but 16.5 gallons out of 18.5 is close enough to empty for me. Gas gauge works perfect too! $150 shipped to my door. Hold on...you're using a XJ sender with a MJ tank? Link to comment Share on other sites More sharing options...
TexanEliminator Posted May 22, 2019 Share Posted May 22, 2019 52 minutes ago, benjy_26 said: Hold on...you're using a XJ sender with a MJ tank? Yep. Has to be a tank without the pan in the bottom for the sending unit to fit correctly as the pickup is pointed toward the front vs toward the rear on a Comanche sending unit. JP5B on autozone.com. Link to comment Share on other sites More sharing options...
benjy_26 Posted May 22, 2019 Share Posted May 22, 2019 2 hours ago, TexanEliminator said: Yep. Has to be a tank without the pan in the bottom for the sending unit to fit correctly as the pickup is pointed toward the front vs toward the rear on a Comanche sending unit. JP5B on autozone.com. Interesting... I wonder if the same applies to Renix trucks. Link to comment Share on other sites More sharing options...
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