Xj tank in the bed problems

Swamprat

New member
I just put an xj tank in the bed of my truck, and its reading way high. Nearly empty in the xj reads just over a half a tank on my mj. Could it be that the tank is angled too far forwards or backwards? Has anyone else had any issues like this?
 

WiscoXJ

New member
The senders in the MJ's and XJ's are different as well as the fuel gauges are different. for a MJ empty is 0 ohms and full is 80 phms. on an XJ empty is 105 ohms and full is 5 ohms. they are backwards and about 20% off. the only way o fix it is to either pull out the sender and switch the wire on the potentiometer in which case it will read in the correct direction but still be 20% off. otherwise you can find a XJ fuel gauge and swap into your cluster. that will rectify the issue completely without having to switch the wire on the pot. much discussion on this over on comanche club..

https://www.google.com/?gws_rd=ssl#safe=active&q=fuel gauge off site:comancheclub.com
 

Swamprat

New member
Im running am xj gauge cluster, is there a year split? The tank is out of a 89, and my cluster is out of a 91
 

Swamprat

New member
got it, swapped senders with my my spare HO one. and everything works now. i'm going to ohm out the renix, HO and MJ potentiometers and get readings on all of those for future reference here.
 

WiscoXJ

New member
renix is 0-80 ohms HO is 105-5 ohm's. theres resistors on the gauge itself too, not sure what those ohm out to
 
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