Originally Posted by
skyking
In the gas filler tube there is a line out to a recovery tank for vapors in the fuel tank. I notice lots of people "topping" thier tanks to try to get as much fuel into the tank as they can. This now allows liquid fuel to head to the vapor recovery tank which clogs and fills this tank with gasoline insted of fumes. This in addition to a loose fuel cap may be the problem for this code.
In the fuel filler tube, there is just a valve that seals the system until fuel opens it when refilling. There is also a valve at the bottom of the fuel fill tube that stops the overfilling of the gas tank, there is no airline in this area.
The fuel fumes are allowed out by a solenoid to the Evap canister.
If either of these valves fail then they could cause trouble.
