 printable version
System of catching of fuel evaporations (ECS)
Operating principle The ECS is used to reduce the ingress of hydrocarbon compounds in the atmosphere from the fuel tank. The principle of operation of the system The main system components include a carbon adsorber purge control valve, sealed by a fuel tank and 3.0 liter models, thermovacuum valve (TVV).  | Location of the control valve and purge of a coal adsorber models 4.2 l |
When the engine stopped, the fuel evaporation gradually fill all the free space from the fuel tank capacity. Since the tank is equipped with a sealed cover, the vapor pressure rises, and they are displaced in the carbon adsorber, where accumulated. One-way check valve prevents the adsorption of liquid fuel. When starting the engine a small amount of vapor enters the intake manifold through the constant purge orifice and combusted in the composition of air-fuel mixture. With increasing engine speed, the Main canister purge orifice, from which is derived in this case a larger volume accumulated during parking fumes. On models 3.0 liters for closing the main orifice blowing at a low temperature of the engine, a special thermovacuum valve (TVV). Service  | System maintenance should be carried out regularly, with particular attention to the points listed below. |
| - Check the patency and structural condition of all hoses.
 | - Check the condition of gasket fuel filler cap (see. Accompanying illustration). Make sure of serviceability of functioning of the vacuum relief valve.
|
- Check the operation of a coal adsorber and unilateral control valve.
|
|
Checking the carbon adsorber | - Look for signs of adsorber damage or leaks. If necessary, replace.
- Mark and disconnect the hoses from the canister.
- Blow in the upper hose nozzle purge control. The air should not be held.
- Blow in the lower hose nozzle purge. Air should pass freely.
- Blow in the union of the inlet hose. The air also must be purged.
- If necessary, replace the adsorber.
|
|
Check unilateral control valve |  | - Remove the valve from the fuel tank (see. Accompanying illustration).
|
- Blow in facing the fuel tank valve fitting. The air should not be held.
- Blow in the union of the valve located on the side of a coal adsorber. The passage of air must be free.
- If necessary, replace the valve.
|
|
| 
