Fuel Vapour Separator (Emission control)

Fuel Vapour Separator

1. Fuel filler neck
2. Breather pipe
3. Vapour separator
4. Fuel cap

Fuel vapour evaporating from the fuel tank is routed to the evaporative emission canister through the vapour separator and vent line. Liquid fuel must not be allowed to contaminate the charcoal in the EVAP canister. To prevent this, the vapour separator fitted to the filler neck allows condensed fuel to drain back into the tank.

The fuel vapour separator is located under the rear wheel arch, protected by the wheel arch lining. The connections to the separator unit are quick release devices at the end of flexible hoses which connect the fuel tank to the inlet side of the separator and the outlet of the separator to the evaporation vent line.

Fuel Filler Cap

The fuel tank filler cap incorporates a pressure valve which allows excess pressure to escape (blow-off) at between 10 - 10.8 kPa, (1.50 - 1.57 psi).

Two way Valve

A two way valve is included in the vent line which allows tank pressure to build to 1.80 - 5.03 kPa, (0.26 - 0.73 psi). Above this pressure, vapour is allowed to pass along the vent line to the carbon canister. Vapour is allowed to flow back into the fuel tank as the fuel cools by way of a non return valve within the body of the two way valve.