EVAP system: Difference between revisions
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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. | 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 == | |||
[[File:W220_fuel_evaporation_control_system.png|thumb|none|EVAP system related parts in [[EPC]]]] | |||
== Connection diagram for evaporative emission control system (M113) == | == Connection diagram for evaporative emission control system (M113) == | ||
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# Raise vehicle. | # Raise vehicle. | ||
Revision as of 20:02, 28 September 2021
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
Connection diagram for evaporative emission control system (M113)
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Shown on engine 113 from 09/97 in model 210
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Connection diagram for evaporative emission control system (M112)
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Shown on engine 112 from 09/97 in model 210
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Remove/install activated charcoal canister
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Shown on MODEL 220
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- Raise vehicle.
- Remove rear left wheelhousing liner
- 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)
- Remove activated charcoal canister (77). Lift up and out.
- Install in the reverse order