Pic. 2-77a. EURO-2 gasoline vapor recovery system:
1 - adsorber hose and gas tank valve;
2 - fuel tank valve;
3 - gas tank valve hose of the steam pipeline;
4 - throttle pipe with a receiver;
5 - adsorber hose and throttle pipe;
6 - adsorber;
7 - collar;
8 - bolt;
9 - adsorber mounting bracket;
10 - nut;
11 - steam pipeline and gravity valve hose;
12 - gravity valve;
13 - steam pipe;
14 - fuel tank.
Gasoline vapor recovery system (SUPS) consists of a carbon adsorber 6 (pic. 2-77a) with purge solenoid valve, gas tank valve 2, gravity valve 12, steam pipe 13 and hoses 1, 3, 5 and 11.
Gasoline vapors pass through the gravitational valve 12 and the gas tank valve 2. The gravity valve prevents fuel from leaking out of the tank when the car rolls over, and the gas tank valve prevents excessive increase or decrease in pressure in the fuel tank.
After passing through the valves, gasoline vapor enters the adsorber 6, where it is absorbed by activated carbon. The second fitting of the adsorber is connected by a hose 5 to the throttle pipe, and the third - to the atmosphere. When the engine is off, the solenoid valve is closed, in this case, gasoline vapors do not enter the throttle pipe. After starting the engine, the injection system controller begins to supply control pulses to the valve. The valve opens and the sorbent is purged: gasoline vapors are discharged through hose 5 and the throttle pipe into the receiver.
Pic. 2-77b. EURO-3 gasoline vapor recovery system:
1 - hose of the throttle pipe and the adsorber purge valve;
2 - solenoid valve for adsorber purge;
3 - purge valve and adsorber hose;
4 - adsorber;
5 - steam pipe hose;
6 - throttle branch pipe with a receiver;
7 - bolt;
8 - adsorber mounting bracket;
9 - nut;
10 - steam line hose and adapter;
11 - adapter;
12 - hose adapter and gravity valve;
13 - gas tank cap with safety valve;
14 - gravity valve;
15 - steam pipe;
16 - fuel tank.