Jeep YJ: Fixing a Fuel Gauge That Always Reads Full

A fairly common problem in many vehicles, bust especially Jeep YJ (Wranglers) is that the fuel gauge shows full, or above full, all of the time. Today we'll see how to diagnose where the problem is and how I fixed mine.

[@chevybeaglenox2402]

Very informative! I like the way you described everything you did.

[@tattoosteveneo]

We need more beeps! I’m sure those are to come as you are working on that old dodge. Trust me I know as I have a 78 truck 😂😂😂

[@giuseppe_ing]

Thank you so much from Italy.

[@SEES243PK]

Thanks for this awesome information

[@dbarr1661]

Solved it! Thx for the help.

[@Hillbillypunk]

But if C31 is sperated for that resistance test, wouldn't that give you zero ohm regardless of the fuel level? (If it's "ok") The gauge is what has the resistor, i think.

[@renemiramontes.loscabosgui5399]

Awesome video! Just replaced the old circuit behind the cluster and all gauges but Temp went over the maximum! Can't imagine what could it be. Any thoughts? Already suscribed and following ✌🏽😎

[@YoshimoshiGarage]

I would guess a bad ground

[@ukjeeper]

Lucky break! Just dirty contacts? Need to pull my 91 cluster out, as the only thing that works properly is the clock. Fuel gauge reads accurately, until you turn the engine on, then it jumps up 1/4 tank higher. The oil pressure, engine temp do nothing, and the voltmeter needle constantly vibrates at +/- 14 volts. Hopefully a good dose of contact cleaner will have the lucky result you got.

[@ukjeeper]

Some progress made, after cleaning all four gauge contacts. All the gauges now have 'life'. But... the fuel gauge still jumps up by 1/4 tank when the engine is on. the temp gauge only reaches the first small line, the oil pressure gauge jumps to just below 60. But the volt meter has stopped 'vibrating' and stays steady, just above 14v. Next step, to check the oil pressure and temp sensors on the engine?

[@YoshimoshiGarage]

Check the sensors right at their terminals. It could also be the wires running from the terminals to the gauges-the bulkhead in the firewall being the most likely culprit

[@bdrone9183]

Did you get the replacement bulbs on Amazon?

[@YoshimoshiGarage]

Yes. 198 bulb replacement LEDs

[@user-vl2lz9fk9y]

​@@YoshimoshiGarage my 150 scooter gauge doesn't work I've tried 2 gauges one led worked when hooking it up then died. Chinese garage.?!! I'll check the sensor it's pissing me off. Thanks for your time if you can help. 👍😀

[@DoctorTorque]

Why would you want to do that? You had a tank that was never going to be empty, and now you messed that up. Gah!

[@YoshimoshiGarage]

I needed to get more video with beeps up!

[@DoctorTorque]

Yeah. It has been pretty beepless lately.