5.4. System of catching of vapors of fuel

Scheme of system of catching of vapors of fuel


The system of catching of vapors of fuel prevents evaporation of vapors of fuel in the atmosphere from the fuel tank therefore formation of a photochemical smog is prevented.

Vapors of fuel accumulate in a canister with absorbent carbon. During the operation of the engine the electronic control unit opens the valve, and vapors of fuel come to the engine where there is their combustion.

The control valve is used for management of pressure of vapors of fuel in the fuel tank.

Check

PERFORMANCE ORDER
1. Disconnect a vacuum hose from throttle knot and instead of it connect the vacuum pump with a vacuum hose.
2. Check the following parameters on the cold engine at a temperature of cooling liquid less than 60 °C and on the hot engine at a temperature of cooling liquid more than 80 °C.

Cold engine

Operational power setting Depression Result
Idling 50 kPa Vacuum is supported
3000min-1

Hot engine

Operational power setting Depression Result
Idling 50 kPa Vacuum is supported
Within 3 min. after increase in frequency of rotation to 3000min-1Depression change attempt Vacuum is absent
In 3 min. after increase in frequency of rotation to 3000min-1 50 kPa Vacuum is supported quickly then is absent