TylerJY Posted December 22, 2011 Share Posted December 22, 2011 My fuel gauge is reading backwards, when we left the house the gauge read full, we went to the gas station and filled it up, took 17 gallons so we know it definitely was not full lol, anyways.. we leave the gas station and the gauge reads empty, and my light is on... Now before we took it for a test drive yesterday the fuel gauge read correctly, could we have knocked a wire loose or something?? '90 MJ w/ HO swap Stock MJ tank and fuel pump Link to comment Share on other sites More sharing options...
Geonovast Posted December 22, 2011 Share Posted December 22, 2011 If you have the full HO wiring swapped in, there's your problem. Link to comment Share on other sites More sharing options...
TylerJY Posted December 22, 2011 Author Share Posted December 22, 2011 We swapped the HO wiring in from the dash forward, but just adapted it to the rear MJ wiring, following the tutorial on here. Link to comment Share on other sites More sharing options...
Geonovast Posted December 22, 2011 Share Posted December 22, 2011 Which gauge cluster are you using? Has it been like this from the swap, or did it just happen out of nowhere? Link to comment Share on other sites More sharing options...
TylerJY Posted December 22, 2011 Author Share Posted December 22, 2011 Full gauge cluster from the XJ ('93) It kinda happened outta no where.. before it was reading what seemed to be correctly, but then we took it down the street yesterday, and now when we went out today it read full lol. Link to comment Share on other sites More sharing options...
shelbyluvv Posted December 22, 2011 Share Posted December 22, 2011 You need a HO MJ fuel level sender to do it correctly. Link to comment Share on other sites More sharing options...
TylerJY Posted December 22, 2011 Author Share Posted December 22, 2011 Okay, thanks :) Link to comment Share on other sites More sharing options...
shelbyluvv Posted December 22, 2011 Share Posted December 22, 2011 Not really. I have a 94 XJ cluster and harness in my 86 V8 MJ. The guage read backwards too. I swapped in a HO sender and all is good. Link to comment Share on other sites More sharing options...
TylerJY Posted December 22, 2011 Author Share Posted December 22, 2011 Alright.. sounds good, thanks Link to comment Share on other sites More sharing options...
HOrnbrod Posted December 22, 2011 Share Posted December 22, 2011 There's a work-around for the Renix senders used on HO conversions but you have to pull it out and do some soldering. Still will not read quite correctly because of the pot winding difference, but it will perate in the right direction. best way though is to install a regulation HO sensor as Bo suggested. http://www.comancheclub.com/forums/viewtopic.php?f=2&t=29013&hilit=renix+sender Link to comment Share on other sites More sharing options...
Geonovast Posted December 22, 2011 Share Posted December 22, 2011 Don, do you happen to have the full/empty resistance values for both the Renix and HO senders? I'm contemplating... Link to comment Share on other sites More sharing options...
HOrnbrod Posted December 22, 2011 Share Posted December 22, 2011 Renix sender is 88 ohms, HO is 105 ohms. If you convert the Renix pot polarity to the same as the HO, the Renix fuel gauge will read about 25% off. More here: http://www.comancheclub.com/forums/viewtopic.php?f=2&t=15936&p=163162&hilit=polarity+fuel#p163162 Link to comment Share on other sites More sharing options...
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