Recently we had our Jeep into the dealership for repairs. The check engine light kept coming on and then found it needed a new gas cap. We picked it up and all was fine until we tried to fill-up the tank. At most gas stations we have to keep pumping with the handle to fill it up. At a few gas stations there is not a problem. We took it back to the dealer and they say they can’t find a problem. Anyone know what the problem could be?
Your vehicle has the Onboard Refueling Vapor Recovery system. What this means is while filling the gas tank the gasoline vapors are captured in the carbon canister before the gas tank can vent.
How this is done is, when the nozzle from the gas pump is inserted into the fill neck, and the pump is turned on, the gasoline being dispensed from the end of the nozzle of the gas pump creates a venturi effect in the fill neck where air is pulled into the gas tank. This then forces the vapors into the carbon canister.
Since this problem occurs at most gas stations but doesn’t at others, I would suspect a problem with the fill neck to the gas tank.