Evaporative Emissions System: Description

The Fuel Evaporation system is used to reduce hydrocarbons (HC) emitted to the atmosphere from the fuel system. This is accomplished by activated charcoals in the carbon canister.

The system consists of a fuel tank with a positive sealing filler cap, carbon canister with purge control valve, fuel check valve, canister purge and vacuum signal, and vapor vent lines. A vent switching valve is used on High Altitude Pickup, Sentra, High Altitude Stanza, and 210 models.

A thermal vacuum valve is used on Sentra, 210 and 310 models. A vapor/liquid separator is used on 200SX Hatchback models. 310 models use a combined check valve with vacuum relief valve.