Inspect and make sure the vent line from the tank to the filler neck is clear and not kinked and the cannister is not plugged. If both are ok (and usually are) the problem is caused by a sticking control valve on the top of the fuel tank. Unfortunately, the valve is molded into the tank and therefore only serviced with the fuel tank assembly so the tank will have to be replaced.
I have the same problem. Also my check engine light is always on... Could this be the root cause? Some type of vaccumm leak?
You should first diagnose the cause of why the check engine lamp is on. It may be related to your other symtoms.
I had the issue come on right before inspection. The key sequence provided an error code of p0152. The garage (NTB) changed the bank 2 sensor 1 o2 sensor wich fixed the issue for it to pass inspection. within 2 miles of driving it home the cel came back on with the same error code. The garage replaced the sensor a second time thinking the sensor was bad... again, the cel came back within 2 miles of driving. Doing some research it looks like the bosch sensor they used as a replacement might be the cause of all the problems... I'm picking up a mopar one tonight and will attempt myself. Just an FYI, this is a 4.0 liter 2006 Jeep Rubicon... Any thoughts?
I cannot find anything relating to that code to a software issue, so since it is a circuit code it would be related to the sensor, wiring or PCM. I would agree that putting a mopar sensor in next would be a good decision.
How can I get to the filler neck and canister to see if it is plugged?
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