On-Board Refueling Vapor Recovery EVAP System

On-Board Refueling Vapor Recovery (ORVR) EVAP system components consist of fuel tank, fuel filler cap, fuel filler pipe check valve/flapper valve, Fuel Tank Pressure (FTP) sensor, fuel vapor vent valve(s), EVAP canister(s), EVAP canister purge valve, Canister Vent (CV) solenoid, related wiring and fuel vapor hoses. For component location and application, refer to illustrations. See Fig 1-Fig 8 . Component descriptions are as follows:

1. Fuel Filler Pipe Check Valve
   
   The fuel filler pipe check valve on Continental, Crown Victoria, Grand Marquis, LS, Mustang, Sable, Taurus and Town Car is located inside fuel filler pipe. Purpose of check valve is to prevent liquid fuel from re-entering the fuel filler pipe during refueling or during a vehicle rollover condition.
2. Fuel Filler Pipe Flapper Valve
   
   The fuel filler pipe flapper valve on Contour, Cougar, Escort, Focus and Mystique, is located inside fuel filler pipe. Purpose of flapper valve is to minimize fuel flow from backing up into fuel filler pipe. Flapper valve is not a positive seal to fuel tank.
3. Fill Limit Vent Valve Assembly
   
   The fill limit valve assembly on Contour, Cougar, Escort, Focus, LS and Mystique controls fuel tank volume and prevents fuel from entering the vent tube in a vehicle rollover condition. The fill limit valve consists of a vent tube, vapor seal (which has an "O" ring on both ends) and a check valve which consists of a float with a spring assembly.
4. Fuel Vapor Vent Valve
   
   Fuel vapor vent valve assembly is mounted on top of fuel tank and is used to control flow of fuel vapor entering the fuel tank vapor delivery line to the EVAP canister. The head valve portion of the fuel vapor vent valve prevents fuel tank from overfilling during refueling. The fuel vapor vent valve also has a spring supported float that prevents liquid fuel from entering fuel tank vapor delivery line under severe handling or a vehicle rollover condition.
5. Fuel Vapor Control Valve (Fuel Tank Mounted)
   
   The fuel vapor control valve on Continental, Crown Victoria, Grand Marquis, Mustang, Sable, Taurus and Town Car is used for preventing liquid fuel from entering the EVAP canister and EVAP canister purge valve.
6. EVAP Canister
   
   Vapors from fuel tank are stored in EVAP canister. With engine running at an RPM higher than idle, vapors are purged from EVAP canister back into the engine for combustion.

Fig 1: Identifying EVAP System Components (Blackwood, Econoline, Expedition, Explorer Sport, Explorer Sport Trac, F150 Pickup, Navigator, Ranger & Windstar)

Courtesy of FORD MOTOR CO.

Fig 2: Identifying EVAP System Components (Continental, Crown Victoria, Grand Marquis, Mustang, Sable, Taurus & Town Car)

Courtesy of FORD MOTOR CO.

Fig 3: Identifying EVAP System Components (Cougar, Escort & Focus)

Courtesy of FORD MOTOR CO.

Fig 4: Identifying EVAP System Components (Escape 2.0L)

Courtesy of FORD MOTOR CO.

Fig 5: Identifying EVAP System Components (Escape 3.0L)

Courtesy of FORD MOTOR CO.

Fig 6: Identifying EVAP System Components (Excursion & F250-F550 Pickup)

Courtesy of FORD MOTOR CO.

Fig 7: Identifying EVAP System Components (Explorer & Mountaineer)

Courtesy of FORD MOTOR CO.

Fig 8: Identifying EVAP System Components (LS & Thunderbird)

Courtesy of FORD MOTOR CO.