terryt Posted May 3 Share Posted May 3 my sending unit has developed a leak where it meets the tank 1990 mj 4.0 long bed any thoughts what I have to do Link to comment Share on other sites More sharing options...
ghetdjc320 Posted May 4 Share Posted May 4 A new lock ring and gasket are probably in order. Pretty simple swap, just make sure to keep the area clean so dirt doesn’t get in the tank when you remove the old gasket. MTS carries the parts you need among others. Part numbers GMLR-1 for the locking ring and GMOR-1 for the gasket Link to comment Share on other sites More sharing options...
terryt Posted May 4 Author Share Posted May 4 Do I need to frail the tank somehow Link to comment Share on other sites More sharing options...
ghetdjc320 Posted May 4 Share Posted May 4 43 minutes ago, terryt said: Do I need to frail the tank somehow Just get it below the sending unit which should be anything less than about 2/3 tank Link to comment Share on other sites More sharing options...
terryt Posted May 4 Author Share Posted May 4 Last question what is MTS Link to comment Share on other sites More sharing options...
terryt Posted May 4 Author Share Posted May 4 it does look like it is the lock ring Link to comment Share on other sites More sharing options...
ghetdjc320 Posted May 4 Share Posted May 4 MTS is a company that makes sending units and related parts. https://www.mtscompany.com/lockrings.htm Link to comment Share on other sites More sharing options...
coolwind57 Posted May 4 Share Posted May 4 I had to braze my sending unit. it was leaking where the tubes meet the disc mount. If your gasket doesn't work for you, you may have to braze. I did Marine JB Weld which worked for nearly a year. Regular JB Weld will not last but a few days. This is your temporary fix. I hope you get dealt the easy hand and have only to replace the gasket. Good luck. Link to comment Share on other sites More sharing options...
terryt Posted May 4 Author Share Posted May 4 Do you think I should just replace the whole sending unit? My concern is my luck my fuel gauge will not read correctly when done Link to comment Share on other sites More sharing options...
ghetdjc320 Posted May 4 Share Posted May 4 1 hour ago, terryt said: Do you think I should just replace the whole sending unit? My concern is my luck my fuel gauge will not read correctly when done MTS can send you the correct gauge sweep sending unit. There are only two gauge sender sweeps, 90- & 91+ Link to comment Share on other sites More sharing options...
terryt Posted May 5 Author Share Posted May 5 What is a gauge sweep Link to comment Share on other sites More sharing options...
ghetdjc320 Posted May 5 Share Posted May 5 1 hour ago, terryt said: What is a gauge sweep It’s the resistance reading that the fuel level sender sends to the gauge. Renix era jeeps from 90- read about 85-100 ohms when full and 0 when empty. HO era from 91+ read 0 ohms as full and 100 ohms as empty. Basically the opposite sweep between the two sending units. Link to comment Share on other sites More sharing options...
Pete M Posted May 5 Share Posted May 5 I just did a pump swap on a clean southern truck this past year. ended up replacing literally all of it: tank, pump, hoses, J-hooks, etc. If I ever have to drop another old tank for any reason, I'm just going all-in the first time. but I guess for a simple gasket change, I might try just the gasket? it's not fun working under there. I don't want to do it twice. Link to comment Share on other sites More sharing options...
eaglescout526 Posted May 5 Share Posted May 5 I think doing the XJ is a lot less fun and forgiving than the MJ. With the MJ at least you can get the sending unit out without some fancy finagling and you can actually sit up while doing all the work. Vs the XJ having a whole axle in your way. Link to comment Share on other sites More sharing options...
speeding_infraction Posted May 5 Share Posted May 5 27 minutes ago, eaglescout526 said: I think doing the XJ is a lot less fun and forgiving than the MJ. With the MJ at least you can get the sending unit out without some fancy finagling and you can actually sit up while doing all the work. Vs the XJ having a whole axle in your way. Agreed. Dropping the tank on an MJ vs an XJ, I could do 3 Comanches in the time it took me to do one XJ. Can't remember why tho. Mostly the rear axle being in the way, and having to use a pipe to break loose some of the skid plate bolts on my XJ. The breaker bar was bending... I found it made everything easier to either remove the driveshaft or zip tie it off to the side, so it's out of the way. Link to comment Share on other sites More sharing options...
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