EVAP system

The Evaporative Emission Control System (EVAP) is used to prevent gasoline vapors from escaping into the atmosphere from the fuel tank and fuel system at all times.

A typical system consists of the fuel tank, an EVAP vapor storage canister full of charcoal, valves, hoses and a sealed fuel tank gas cap. The EVAP system is designed to stop fuel system fumes from leaking directly into the atmosphere. Vent lines from the fuel tank pass vapors to the vapor canister, where they are trapped and stored until the engine is started. When the engine is warm and the vehicle is going down the road, the PCM then opens a purge valve allowing the vapors to be drawn from the storage canister into the intake manifold. The fuel vapors are then burned in the engine along with the air/fuel mixture.

Parts

EVAP system related parts in EPC

Connection diagram for evaporative emission control system (M113)

Shown on engine 113 from 09/97 in model 210 17 - Fuel distributor 19 - Intake manifold 75 - Fuel tank 77 - Activated charcoal canister A - Activated charcoal canister line to purge control valve B - Purge control valve line for to intake manifold C - Vent line from activated charcoal canister to fuel tank D - Line for activated charcoal canister vent valve to fuel tank M3 - Fuel pump M16/1 - EA/CC/ISC [EFP/TPM/LLR] actuator (only models 129, 210) Y58/1 - Purge control valve Y62 - Fuel injection valves

Connection diagram for evaporative emission control system (M112)

Shown on engine 112 from 09/97 in model 210 17 - Fuel distributor 19 - Intake manifold 45 - Filler neck (with connection for on-board refueling vapor recovery ORVR) 55/1 - Fuel filter 75 - Fuel tank 77 - Activated charcoal canister M3 - Fuel pump M16/1 - EA/CC/ISC [EFP/TPM/LLR] actuator (only models 129, 210) Y58/1 - Purge control valve Y62 - Fuel injection valves A - Activated charcoal canister line to purge control valve B - Purge control valve line for to intake manifold C - Activated charcoal canister line to fuel tank D - Fuel tank line to activated charcoal canister E - Fuel filter degassing line to fuel tank F - Fuel filter fuel tank fuel return line to fuel tank

Remove/install activated charcoal canister

Shown on MODEL 220 77 - Activated charcoal canister A - Activated charcoal canister purge control valve line D - Vent valve line from activated charcoal canister to fuel tank

1. Raise vehicle.
2. Remove rear left wheelhousing liner
3. Detach activated charcoal canister - purge control valve line (A) and vent valve line - activated charcoal canister to fuel tank (D) at activated charcoal canister (77)
4. Remove activated charcoal canister (77). Lift up and out.
5. Install in the reverse order