Jeep cherokee gas gauge not working

My gas gauge never indicates the tank is full, I fueled up this morning and it was 2 bars below full. Anybody know why?

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My gas gauge never indicates the tank is full, I fueled up this morning and it was 2 bars below full. Anybody know why?

Hi there,

First time I hear about something like this here on the forum. We've seen people not being able to pump gas into the tank because of pressure caused by overfilling, but not quite like you're describing.

- How much gas have you been able to get into the tank when Empty (or close to Empty) ?
- Do you tend to top off after the first clic ?

Hi there,

First time I hear about something like this here on the forum. We've seen people not being able to pump gas into the tank because of pressure caused by overfilling, but not quite like you're describing.

- How much gas have you been able to get into the tank when Empty (or close to Empty) ?
- Do you tend to top off after the first clic ?

I get great mileage, I can only assume that the tank is full and the sensor is misreading the levels.
To answer your questions
It goes until it is full then I top off.

I have also not topped off and it never read full.

I've had the jeep since April and it had only ever shown full once. It is still under warranty, wonder if it's a sensor

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I get great mileage, I can only assume that the tank is full and the sensor is misreading the levels.
To answer your questions
It goes until it is full then I top off.

I have also not topped off and it never read full.

I've had the jeep since April and it had only ever shown full once. It is still under warranty, wonder if it's a sensor

Thanks.

Hmmm. I have to wonder if it isn't the known EVAP pressure problem we've seen with some KLs. You don't seem to be aware of this but the Cherokees don't like being topped off after the first clic. Gas gets into the EVAP circuit and it becomes impossible to fill up completely. Some have had this happen with an empty tank and could barely get any gas in.

Could it be the sending unit ? Maybe. But since you did see Full early on and because you do top off, I think it could be a pressure problem. If it is a pressure problem, the fix is complex and you definitely need to have it done at the dealership.

Do you remember what's the most gallons you've been able to get into the Cherokee when Empty, up to 2 bars below Full ?

Thanks.

Hmmm. I have to wonder if it isn't the known EVAP pressure problem we've seen with some KLs. You don't seem to be aware of this but the Cherokees don't like being topped off after the first clic. Gas gets into the EVAP circuit and it becomes impossible to fill up completely. Some have had this happen with an empty tank and could barely get any gas in.

Could it be the sending unit ? Maybe. But since you did see Full early on and because you do top off, I think it could be a pressure problem. If it is a pressure problem, the fix is complex and you definitely need to have it done at the dealership.

Do you remember what's the most gallons you've been able to get into the Cherokee when Empty, up to 2 bars below Full ?

It will be going to the dealership before it runs out of warranty for its last checkup. I'll be sure to mention the issue.

I have seen after a fill up, the bars eventually go up, but never to full. I'll update when I get it looked at. Your theory is sound and my just be the case

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It will be going to the dealership before it runs out of warranty for its last checkup. I'll be sure to mention the issue.

I have seen after a fill up, the bars eventually go up, but never to full. I'll update when I get it looked at. Your theory is sound and my just be the case

Without knowing how many gallons you can pump into the tank when Empty, I can't say either way, so yeah let the dealership look into it.

If it is a pressure thing, I vaguley recall they need to lower the gas tank... so it's a lenghty job.

Without knowing how many gallons you can pump into the tank when Empty, I can't say either way, so yeah let the dealership look into it.

If it is a pressure thing, I vaguley recall they need to lower the gas tank... so it's a lenghty job.

Yikes lol, they can have at it.

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Yikes lol, they can have at it.

Oh and a friendly suggestion : don't mention the topping off part unless they ask. Just in case the service manager is cranky that day and wants to shift blame on you (oops).

I'm not saying it's your fault if it is in fact a pressure issue. But better to play it safe
(= play dumb :wink: ).

Topping off the tank is a huge no no these days.
That absolutely could be the issue as you seem to be getting back pressure from the EVAP system which is designed to shut the pump off when the tank is full.
Getting any liquid gas into that EVAP system will be bad. I believe its only meant for vapors.
As Mark said just play dumb and hopefully its a combo of something else.
In the future though when it gas pump clicks off the first time that's it for your fill up.
Good luck with your dealer visit and I do hope its a simple fix.