Question about 2004 Jeep Grand Cherokee

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We have a 2004 Jeep Cherokee. Recently, it is almost impossible to refuel becuase the fuel because the gas comes back out. I assume there is a vent tube on the tank to allow air to escape when filling but I cannot locate it. How do I access the fuel tank air vent?

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Hello lbosse

In modern vehicles there is a system that captures the vapors that are emitted when filling with fuel.
They are directed through a carbon canister where these vapors are stored to be burned in the engine later.
Here is a basic description.
In the system there are usually two valves used to operate it.
One is canister vent valve (could be part of another assembly.), the other the canister purge valve.
The canister vent is normally open to allow the vapors when filling to pass through the canister.
Yours is stuck closed and will need to be replaced. On the Jeep it could entail replacing the leak detection pump inside the left rear fender well, behind the wheel.
Sorry I can't remember exactly how it is configured in the Cherokee but I do remember having to replace a couple of these pumps.

If you would like further advise on this, let me know in a comment here and I will try to help you.
Thank you for using FixYa.
KL

Posted on Mar 24, 2011

Testimonial: "Great detailed answer to the problem!"

  • FUBAR Mar 24, 2011

    Thank you kindly for the testimonial and the rating.
    It is appreciated.
    KL

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Vent tube runs parallel with filler tube, blow it out with compressed air.

Posted on Mar 24, 2011

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