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 make use of a small orifice that tends to allow only vapor and not fuel to pass into the line running forward to the vapor storage canister. This assembly mounts directly to the fuel tank using a rubber grommet.

Fuel vapors trapped in the sealed fuel tank are vented through the orificed vapor valve assembly in top of tank. The vapors leave the valve assembly through a single vapor line and continue to carbon canister in engine compartment for storage, until they are purged to the engine when engine is running.

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