Suburban 1/2 Ton 2WD V8-5.3L VIN Z Flex Fuel (2006)
Fuel Filler Hose: Description and Operation
FUEL FILL PIPE
The fuel fill pipe has a built-in restrictor in order to prevent refueling with leaded fuel. When refueling dual tank applications, fuel is dispensed to both
the front and rear fuel tanks at the same time. Once the fill vent is obstructed, fuel backs up the fill pipe and trips the dispensing nozzle. The front fuel
tank vent runs into the rear tank to the top of the filler pipe assembly, which in turn vents to atmosphere. The fuel tank vent valves are connected and
route to the canister to collect hydrocarbon emissions during operation of the vehicle.
