Fill control and vapor venting is accomplished by the following method:
A vent baffle, integral to the fuel tank filler cap (9030)
, which extends inside the fuel tank (9002)
. The fuel vapor valve (9B593)
mounted in the top panel of the fuel tank
, and the attached vapor tube to the fuel vapor canister (9D653)
, also contribute to fill control by controlling
pressure in the fuel tank
.
As the fuel level rises to cover the fill vent, pressure rises in the fuel tank
causing fuel to back up and shut off the fuel dispensing
nozzle.
The vent system is designed to provide an air space, approximately 10
percent of the fuel tank volume, above the fuel level in a full fuel tank
.
The air space allows for thermal expansion of fuel and provides clearance
between the fuel level and the fuel vapor valve
, which is mounted in the top panel of the fuel tank
.
The clearance is sufficient to allow fuel vapor venting through the fuel vapor valve
under all static and most dynamic vehicle conditions.