CMP sensor

EVAP System Schematic – Vehicles from 2002.5 Model Year

3

1 1 2 4 7

15

17

16

14 13 13 13 18

12 10 6

5 M

19 11 9 8

M17 0362

1 Vapour separator 2 EVAP canister 3 DMTL 4 Change-over valve 5 0.5 mm (0.020 in) reference orifice 6 Air pump and motor 7 Air filter 8 ECM 9 Throttle body 10 Purge valve 11 Flap valve 12 Fuel tank 13 Roll over valve 14 ORVR valve 15 Two-way valve 16 Restrictor 17 Fuel filler cap 18 Filler tube 19 Fabric sleeve

Two-way Valve

The two-way valve limits the pressure and depression in the fuel tank and, during refuelling, induces automatic cutoff in the refuelling nozzle when the fuel in the tank reaches the full level. The two-way valve is installed in the vent pipe from the tank, next to the fuel pump assembly. The two-way valve is a normally closed valve that opens, to release pressure from the fuel tank, at 18 to 50 mbar (0.26 and 0.73 lbf/in2). Air is allowed to flow back into the fuel tank, as the pressure in the tank decreases, through a non return valve within the body of the two-way valve. The nominal opening pressure of the non return valve is 1 mbar (0.015 lbf/in2). During refuelling, if the fuel in the tank reaches the full level outward venting becomes restricted, which creates a back pressure in the filler tube and automatically closes the refuelling nozzle. The restriction is caused by the fuel closing the ORVR valve.