Vapor Vent System

This system 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.

All vapor valves use a small orifice that allows only vapor and not solid fuel to pass into the line running to the canister. The vapor valve is mounted on the fuel tank using a rubber grommet.

Fuel vapors trapped in the sealed fuel tank are vented though the vapor valve assembly on top of the fuel tank. The vapors are then routed through a single vapor line to the carbon canister in the engine compartment.

The vapors are stored in the carbon canister until they are purged into the engine while the engine is operating.

On vehicles equipped with fuel/vapor return lines, vapor generated in the fuel supply line is continuously vented back to the fuel tank. This venting prevents engine surging from fuel enrichment and assists in hydrocarbon emission control.