Jeep 53030837 CANISTER-Vapor

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The evaporative emissions control system prevents fuel vapors from escaping into the atmosphere by trapping them inside the fuel tank until the pressure overcomes the pressure-relief/rollover valve, routing them to a charcoal canister for temporary storage. The Powertrain Control Module (PCM) monitors engine parameters and activates the EVAP purge control solenoid to draw vapors into the intake manifold for combustion. In 1995 to 1997 models, the charcoal canister is located behind the right front bumper, while in 1998 and later models, it is on top of the fuel tank, and both are maintenance-free. Common symptoms of a fault include a strong fuel odor or raw fuel leaking from the canister, especially in hot temperatures, with the Leak Detection Pump (LOP) indicating leaks by storing fault codes and illuminating the CHECK ENGINE light. The fuel filler cap features a two-way pressure-vacuum relief valve to manage pressure and vacuum inside the tank. All models have two rollover valves to close vapor vent ports if the vehicle flips. The Onboard Refueling Vapor Recovery (ORVR) system in 1998 and later models uses a control valve to vent displaced vapors to the charcoal canister during refueling, preventing refueling with the engine running. If the CHECK ENGINE light is on, checking the gas cap and system hoses is essential, as a loose cap or damaged hose is often the cause. Further diagnosis requires special equipment and should be performed by a qualified repair shop. For component replacement, the charcoal canister can be removed by relieving tank pressure, raising the vehicle, and disconnecting hoses, with installation being the reverse. The LOP and charcoal canister on 1996 and 1997 models require additional steps, including removing the right headlight assembly and disconnecting electrical connectors. In 1998 and later models, the canister and LOP are mounted on a bracket on the fuel tank, necessitating fuel tank removal and checking all EVAP system hoses and connections. The canister purge control solenoid must be installed with the electrical connector facing up, with its location varying by model year, and removal involves disconnecting hoses and electrical connectors before reinstalling in reverse order.

A strong fuel odor in the engine compartment or raw fuel leaking from the canister are common symptoms of a fault in the system, especially in hot temperatures.