EMISSION CONTROL - K SERIES KV6 (page 3 of 7)

EMISSION CONTROL - K SERIES KV6

DESCRIPTION AND OPERATION

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EVAP System Schematic – Vehicles from 2002.5 Model Year

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 cut-
off 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/in

2

). 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/in

2

).

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.

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