General Description

Enhanced EVAP Emission System:

Fuel evaporation is a normal process in any fuel system. The purpose of the Evaporative ([1][2]EVAP) Emission System is to limit the amount of fuel vapors (hydrocarbons) escaping into the atmosphere. To accomplish this, the EVAP system transfers the fuel vapors that accumulate in the fuel tank into an activated carbon storage container - the EVAP canister. The EVAP canister will store these vapors until the PCM determines that the engine is able to burn this stored fuel vapor. When the PCM determines that the engine is able to use this stored fuel vapor, it (along with fresh air) is drawn (purged) into the intake air flow (by opening the purge solenoid) and consumed in the normal combustion process.

The components that make up the enhanced evaporative emission system consist of the following:
(1) EVAP Canister Vent Solenoid (located on the upper end of the fuel filler pipe just behind the right rear wheelhouse liner)
(2) Fuel Tank
(3) Evaporative Emission System Canister (nested on the top of the fuel tank at the left, front corner)
(4) Fuel Tank Pressure Sensor (inserted on the top of the fuel pump module cover)
(5) System Fuel Lines and Hoses
(6) Evaporative System Service Diagnostic Port (located in the Canister Purge Line, on top of passenger's side strut tower
(7) Canister Purge Solenoid (mounted in circuit board of EVAP system service diagnostic port)