Gas Gauge Not Working?

Tiny
STEVE CATT
  • MEMBER
  • 2000 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 90,000 MILES
I ran out of gas one day only to find out my gas gauge was not operating. Someone told me since I was low, I probably hit a bump and the float may have got hung up? What do you think and how would one fix it? Thanks.
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Friday, May 15th, 2009 AT 6:27 PM

12 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
The float is part of the fuel pump. It works off a rheostat. It is common for the rheostat to go bad and cause false fuel level readings. I doubt a bump caused the problem, but regardless, to check you will need to remove the fuel tank and then the pump assembly.
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Sunday, May 17th, 2009 AT 3:03 PM
Tiny
GREG64
  • MEMBER
  • 1996 JEEP CHEROKEE
My son's 1996 Jeep Grand Cherokee / 4.0L Inline 6-cyl (180K miles) has a fuel delivery issue. There is no fuel pressure on the fuel rail while cranking (Schrader valve depressed to check). Also, the fuel gauge is not working. I know the gauge isn't working because I added 5-6 gals of gas hoping he'd run it dry. But no registration or movement of the gas needle at all. The truck was running fine and one morning last week would crank, but not start.

So, I disconnected the wiring harness at the gas tank and check for continuity through to the pump/sending unit. I found continuity across two of the four terminals. On the supply side of the harness I found no power with the ignition key turned to the run position. I don’t see any damage to the wiring from tank to fuse box.

I know that due to the miles on the truck I should suspect the pump unit, but I’m really not sure its getting any power. Could it be something simple I’ve overlooked? Fuses seem good, but I don’t know about the little black relays thingies in the fuse box do they ever go bad? I’m looking to get out of this cheaply as I just sank $1500 into a new front suspension thanks to my boys accidental, rainy night, ditch run.
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Wednesday, April 8th, 2020 AT 6:00 PM (Merged)
Tiny
MIKEYBDMAN
  • EXPERT
I qwould try a new fuel pump relay in the power distribution center. Pretty simple system. It completes the power circuit thru the ignition switch and the PCM. If this relay is not bad, then the only items left are the pump, PCM and ignition switch. I would think pump, but if you are not getting power to the pump, it may be something else. If the relay change doesnt fix the problem, supply power to the pump and eliminate that.
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Wednesday, April 8th, 2020 AT 6:00 PM (Merged)
Tiny
MALIK LAFRAMBOISE
  • MEMBER
  • 1995 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • MANUAL
  • 100,000 MILES
Hey my fuel gauge doesnt work where do I begin to fix this and is it easy?
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Wednesday, April 8th, 2020 AT 6:01 PM (Merged)
Tiny
BLUELIGHTNIN6
  • EXPERT
If it's completely inoperative then check fuses and check wiring to back of instrument cluster first. If all good then suspect faulty fuel sending unit
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Wednesday, April 8th, 2020 AT 6:01 PM (Merged)
Tiny
MRNKAB
  • MEMBER
  • 1988 JEEP CHEROKEE
Hi. I have an '88 Jeep Cherokee that has about 253,000 miles on it. The engine is rebuit but transmission is original. It is the 4cyl engine-standard. It sat for a few months in the woods & cranked up fine with a new battery & no probs for a month or so but now has a prob. It started sputtering about a week ago & noticed the fuel gauge was not working correctly. It stalls out on me sometimes & now if I get below 1/4 a tank of gas it dies. We've changed the fuel filter & also the plugs. I don't know if it has a fuel sensor since it's so old so can anyone help? We're thinking about taking the fuel tank out & cleaning it out really good but anything else we should/can do? Thank you anybody that can help! :X
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Wednesday, April 8th, 2020 AT 6:01 PM (Merged)
Tiny
BLACKOP555
  • EXPERT
Sounds to me like a bad fuel pump! Replace.

Take the tank off and clean it also when you put in a new pump, its rare for a pump to last over 100k let alont 200k!
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Wednesday, April 8th, 2020 AT 6:01 PM (Merged)
Tiny
MRNKAB
  • MEMBER
Thanks for the info but he said he's replaced the fuel pump several times already but always uses used pumps out of junkyards. Anything else it might be? Thanks again.
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Wednesday, April 8th, 2020 AT 6:01 PM (Merged)
Tiny
BLACKOP555
  • EXPERT
Getting them from the junk yards is not the smartest thign to do, a majority of them sit there and corode in the gas tanks and wear out, I think you should buy a new one and you should be good to go.
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Wednesday, April 8th, 2020 AT 6:01 PM (Merged)
Tiny
MRNKAB
  • MEMBER
I know in a perfect world we'd all have all the money we wanted & our cars would never break down but I live in reality so sometimes we do what we have to do to get by. Thanks.
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Wednesday, April 8th, 2020 AT 6:01 PM (Merged)
Tiny
BLACKOP555
  • EXPERT
Im not trying to insult you mate. Im just saying the amount you spend on one isnt that much cheaper then buying one that will last the rest of the life of your vehicle.
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Wednesday, April 8th, 2020 AT 6:01 PM (Merged)
Tiny
MRNKAB
  • MEMBER
Thanks for the advise.
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Wednesday, April 8th, 2020 AT 6:01 PM (Merged)

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