Jeep 4891739AA Valve-Linear PURGE

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The Evaporative emissions control (EVAP) system prevents fuel system vapors from escaping into the atmosphere. On warm days, vapors trapped inside the fuel tank expand until the pressure reaches a certain threshold, at which point the fuel vapors are routed from the fuel tank through the fuel vapor vent valve and the fuel vapor control valve to the EVAP canister, where they're stored temporarily. When the conditions are right, the Powertrain Control Module (PCM) opens the canister purge solenoid, allowing the fuel vapors to be drawn from the canister into the intake manifold, where they mix with the air/fuel mixture before being consumed in the combustion chambers. The EVAP canister, which contains activated charcoal, is located underneath the vehicle, just in front of the fuel tank. The Evaporative System Integrity Monitor (ESIM) switch is mounted on one of the EVAP canisters. The EVAP canister purge solenoid, under the control of the PCM, regulates the flow of vapors being purged from the EVAP canister into the intake manifold. The most common symptom of a faulty EVAP system is a strong fuel odor. To check for excessive fuel vapor pressure in the fuel tank, remove the gas cap and listen for the sound of pressure release. Component replacement involves disengaging the EVAP canister purge solenoid from its mounting bracket, disconnecting the electrical connector and vacuum hoses, and removing the vapor hoses. For EVAP canisters, the vehicle needs to be raised and securely placed on jackstands, then the vapor hoses and wiring are disconnected, the lower support bracket is removed, and the EVAP canisters are taken out.

The EVAP canister purge solenoid is located in the engine compartment, while the NVLD filter, EVAP canister, and NVLD pump assembly are located in front of the fuel tank. The NVLD filter can be removed without removing the canister, but the canister must be removed to access the NVLD pump. To remove the NVLD pump, squeeze the locking tab and rotate it counterclockwise.

To check for excessive fuel vapor pressure in the fuel tank, remove the gas cap and listen for the sound of pressure release.