My daughters Camry was running great until she filled up the gas tank 2 days ago. She said it ran rough as soon as she started the car and pulled away form the pump. The tank wasn't on E as the low fuel light was not on. She did not top off the tank, stopped after the auto shutoff. The car accelerates poorly and runs even worse with the air on.

Not sure what could be the cause of this sudden change in performance. Any ideas?

 

4 or 6? Well if you discount coincidence after filling the tank then I would check the evaporative system. Raw fuel could be getting into the throttle body from the charcoal canister. Is the canister original? It could be defective canister or canister check valve. I would disconnect the vacuum line that runs from the canister to the throttle body (not the line from the gas tank) and see if the condition fixes. If so then investigate canister and check valve. There may be a vacuum circuit diagram of the system under the hood to guide you. When disconnecting the vac line from the cannister you should cap it off as you don't want fuel or fuel vapors in the engine compartment.

 

It is the 4 cyl.

 

And she is 100% confident she filled it with Gasoline and not Diesel fuel? I seen this happen many times... just want to throw that possibility out there.

JJ

 

It maybe water in the fuel.