Jeep 4891731AA Valve-Linear PURGE

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The Evaporative Emissions Control (EVAP) system prevents fuel system vapors from escaping into the atmosphere.

The fuel evaporative emissions control (EVAP) system is responsible for absorbing fuel vapors from the fuel tank and releasing them into the engine intake system during engine operation. This system utilizes a canister filled with activated charcoal to absorb and store fuel vapors. The fuel tank filler cap is equipped with a two-way valve that vents fuel vapors to the atmosphere in the event of a system failure. A check valve regulates the flow of fuel vapor from the tank to the canister, preventing fuel flow when the tank is full or during a rollover accident. The EVAP system is electronically controlled by the PCM, which operates a purge control solenoid to open a diaphragm valve in the canister, allowing fuel vapors to be drawn into the intake manifold. The PCM controls the rate of flow by adjusting the duty cycle of the solenoid. A leak detection monitor system is also in place to detect any leaks in the EVAP system. Component replacement involves removing and installing the EVAP canister, purge control solenoid, and leak detection pump. The canister is located underneath the vehicle, while the solenoid is mounted in the engine compartment and the pump is located on the front of the fuel tank.