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Old 10-11-2012, 08:44 AM   #1
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Fuel gauge problem

Hi all! I fueled my 2012 wrangler unlimited yesterday while the engine was running. The gauge is still reading almost empty although it has a full tank. It only has 18500 miles on it. I am sure it is covered under warranty and i made an appt for monday to have it checked at the dealership. I would rather not spend my morning there however. I disconnected thd battery then reconnected it but still reading empty. Any suggestions?

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Old 10-11-2012, 08:46 AM   #2
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Never heard of this one before. Perhaps you shouldn't fill your JKU while the engine is running?

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Old 10-11-2012, 08:55 AM   #3
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would never fill up while running
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Old 10-11-2012, 09:00 AM   #4
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Quote:
Originally Posted by bri3400
Hi all! I fueled my 2012 wrangler unlimited yesterday while the engine was running. The gauge is still reading almost empty although it has a full tank. It only has 18500 miles on it. I am sure it is covered under warranty and i made an appt for monday to have it checked at the dealership. I would rather not spend my morning there however. I disconnected thd battery then reconnected it but still reading empty. Any suggestions?
Ive seen this before on another forum and am trying to find it. If i remember correctly he let it sit over night and it was corrected in the morning.
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Old 10-11-2012, 09:02 AM   #5
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My bimmer is 30 minutes for an ECU reset. That's what I heard. Seems to work. Try 30 minutes at least.
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Old 10-11-2012, 09:08 AM   #6
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Cold be a relay in the tank
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Old 10-11-2012, 09:30 AM   #7
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There's a sending unit in the fuel tank. It's variable resistor connected to a float (not unlike a toilet bowl float). it will read something like 20-150 Ohms. If Jeep's system gets an erroneous value, the system defaults to displaying an empty tank. Overfillling can cause this problem. Perhaps it got stuck or broken. Also, a slight adjustment error during assembly can cause this problem. There's a chance as you burn down about 1/2 your tank it will reset. I worked with one of these systems interfacing a generic sending unit in a fuel cell for a driveline transplant. I solved it by inerting a 10 ohm resistor inline, but that's too much info.

If it doesn't fix itself at 1/2 tank you are going to the dealer. They will read the code, likely reading a malfunction and then probably drop the tank and replace the sending unit (might include a new fuel pump).

They would appreciate it if you don't take it in on a full tank.
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Old 10-11-2012, 01:23 PM   #8
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Thanks for all of the help!!

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