Mopar 4669869AD CANISTER-Vapor

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The fuel EVAP system captures fuel vapors and then vents them to join the intake manifold air fuely mixture during operation of the engine. The charcoal canister is mounted at the right front corner of the fuel tank, and when the engine is turned off, fumes move by hoses toward the EVAP canister where it is stored until the next time the vehicle is driven. Vapors pass through a control valve and a flow management valve which also serves as the liquid separation; the flow management valve is a replaceable part whereas the control valve is not, meaning that when the control valve get damaged, the fuel tank has to be replaced. A rollover valve in the fuel tank is located and prevents fuel flow through vapor hoses if it rolls over; it is also non-adjustable. There is an electrically controlled proportional purge solenoid that lets vapor get into the throttle body and this one works when the Powertrain Control Module (PCM) throws open the EVAP canister, but this is not active during cold start and warm up. Other California models from 2000 to 2002 are the LOP, a Leak Detection Pump while in 2003, models made in California have a Natural Vacuum Leak Detection or the NVLD tool. To replace, the proportional purge solenoid must be lifted and the electrical connector removed and hoses labeled before disconnecting them; the solenoid is slid off a clip. In the LOP procedure it is necessary to disconnect the electrical connector, to unbolt the rear stabilizer bar bracket and to remove together with the bracket the pump. The second is the replacement of the EVAP canister in which the vapor hoses are labelled and disconnected, the mounting nuts are removed and the canister is removed from the bracket. For other models not from California, the breather is on top of the EVAP canister, which can be reached only after removing the hose and loosening a bolt to get to it, and making sure that it is in the right position before replacement.

The most common cause of system pressure loss in the evaporative emissions control system is a loose or poor-sealing gas cap.