Fuel Tank Pressure Control Valve (High Altitude 4.3L Except "S" & "T" Series & V8)

Fuel tank pressure control valve allows vapors to flow from the fuel tank into the EEC system. When fuel tank pressure exceeds the spring pressure on the valve diaphragm, the valve opens and allows vapors to either enter canister or, when purge is enabled, go directly to the engine.

The tank pressure control valve is located inside the gas cap on the 3.1L, in the engine compartment on "C" and "K" Series and near the fuel tank on other models.