E 350 Van V8-460 7.5L VIN L 4-BBL (1987)
ORIFICE/ROLLOVER VALVE ASSEMBLY
The orifice valve tends to meter the amount of fuel vapor passing out of the tank. The fuel vapors trapped in the sealed fuel tank are vented through the
orifice fuel tank vapor valve assembly. The vapors then leave the valve assembly through a single vapor line and continue to the carbon canister in the
engine compartment for storage, until they are purged to the engine.
VAPOR VENT
In-tank venting provides a vapor space above the gasoline surface in the fuel tank. This area is sufficient to permit adequate breathing space for the tank
vapor valve assembly under all static and most dynamic condition.