JeepFanactic Posted February 3, 2020 Share Posted February 3, 2020 My MJ has been sitting in the garage for a while. Started it up today and the fuel gauge reads past the full mark. I haven't driven it in a while. Any ideas? Thanks Link to comment Share on other sites More sharing options...
rylee144 Posted February 3, 2020 Share Posted February 3, 2020 mine did that when the fuse was out. might check that. Link to comment Share on other sites More sharing options...
Eagle Posted February 3, 2020 Share Posted February 3, 2020 For the '87, I believe the fuel gauge sender has the same resistance range as the other gauge senders, 0 -88 ohms. 0 ohms indicates empty and 88 ohms equals full. A short circuit would result in zero (or nearly zero) ohms and would indicate empty. A broken wire would indicate full. You probably have a broken wire or a bad ground. Link to comment Share on other sites More sharing options...
JustEmptyEveryPocket Posted February 3, 2020 Share Posted February 3, 2020 3 hours ago, Eagle said: You probably have a broken wire or a bad ground Or maybe you have an awesome magic truck that makes more fuel for itself the longer you let it sit...... but probably its a broken wire. Link to comment Share on other sites More sharing options...
omega_rugal Posted February 3, 2020 Share Posted February 3, 2020 broken wire, bad ground Link to comment Share on other sites More sharing options...
JeepFanactic Posted February 7, 2020 Author Share Posted February 7, 2020 How do I check for either a broken wire or bad ground? Link to comment Share on other sites More sharing options...
Ωhm Posted February 8, 2020 Share Posted February 8, 2020 At Fuel Pump Motor, disconnect C139. On the Fuel Gauge side of the harness, ground C139_B. KEY ON. Does Fuel Gauge read Empty? On the Fuel Sender side of harness take continuity test between C139_B and ground. Does ohmmeter read between 0-88 ohms? Link to comment Share on other sites More sharing options...
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