The separator is secured with screws in a niche of the right rear part of the body. It is connected to the adsorber in the engine compartment by hoses and pipes. In the hose cuts near the separator, a gravity and two-way valve are installed, as well as a tee connected to the fuel vapor release hose. The latter comes out from the outside of the body near the filler neck, and a safety valve is installed in its cut. Fuel vapors from the tank partially condense in the separator, the condensate drains back into the tank.
The remaining vapors pass through the gravity and two-way valves and enter the adsorber. The gravity valve prevents fuel from leaking out of the tank when the car rolls over, and the two-way valve prevents excessive pressure increase or decrease in the fuel tank.
In the adsorber, fuel vapors are absorbed by activated carbon. The second nipple of the adsorber is connected by a hose to the throttle assembly, and the third one is connected to the atmosphere. When the engine is turned off, the latter is blocked by an electromagnetic valve, and in this case the adsorber does not communicate with the atmosphere. When the engine is started, the injection system controller begins to send control pulses to the valve with a frequency of 16 Hz. The valve communicates the cavity of the adsorber with the atmosphere and the sorbent is purged: gasoline vapors are sucked through the hose and the throttle assembly into the receiver and then into the engine cylinders. The greater the air consumption of the engine, the longer the duration of the control pulses, the more intense the purging.
Fuel pump – electric, submersible, rotary, structurally combined with fuel level sensors and its reserve balance in the tank. It is installed on studs in the upper part of the fuel tank. The pump is switched on by the injection system controller command (with ignition on) via a relay. From the pump, fuel is supplied under pressure through hoses and pipelines located under the bottom to the fine filter in the engine compartment and then to the fuel rail.
Fine fuel filter – non-separable, in a steel housing, with a paper filter element, located on the left side of the engine compartment. An arrow is applied to the filter housing, which must coincide with the direction of fuel flow.
The fuel rail serves to supply fuel to the injectors and is fixed to the intake manifold. It has a fitting for monitoring the fuel pressure (from the side facing the engine shield) and a pressure regulator. The latter changes the pressure in the fuel rail within the range from 2.8 to 3.2 bar (2.8–3.2 atm) depending on the vacuum in the receiver, maintaining a constant pressure difference between them. This is necessary for precise dosing of fuel by the injectors.
The fuel pressure regulator is a fuel valve connected to a spring-loaded diaphragm. The valve is closed under the action of the spring. The diaphragm divides the regulator cavity into two isolated chambers - "fuel" and "air". "Air" is connected by a vacuum hose to the receiver, and "fuel" - directly to the ramp cavity. When the engine is running, the vacuum, overcoming the resistance of the spring, tends to draw in the diaphragm, opening the valve. On the other hand, fuel presses on the diaphragm, also compressing the spring. As a result, the valve opens, and some of the fuel is released through the drain pipe back into the tank. When you press the gas pedal, the vacuum behind the throttle valve decreases, the diaphragm, under the action of the spring, closes the valve, and the fuel pressure increases. If the throttle valve is closed, the vacuum behind it is maximum, the diaphragm pulls the valve more strongly - the fuel pressure decreases. The pressure difference is set by the spring stiffness and the valve opening size, and is not subject to adjustment. The pressure regulator is non-separable, and is replaced when it fails.
The injectors are electromagnetic valves that let fuel through when voltage is applied and are locked by a return spring when power is removed. At the outlet of the injector there is a sprayer through which fuel is injected into the intake pipe. The injectors are sealed in the ramp with rubber rings; it is recommended to replace them each time the injector is dismantled.
The injection system controller controls the injectors. If there is a break or short circuit in the winding, the injector should be replaced. If the injectors are clogged, they can be washed on a special service station stand without dismantling them.
The plastic air filter housing is installed in the rear right part of the engine compartment on three rubber holders. The filter element is paper. After the filter, the air passes through the mass air flow sensor and enters the intake hose leading to the throttle assembly. The throttle assembly is attached to the receiver. By pressing the gas pedal, the driver opens the throttle valve, changing the amount of air entering the engine, and therefore the combustible mixture - after all, the fuel supply is calculated by the controller depending on the air flow. When the engine is idling and the throttle valve is closed, air enters through the idle speed regulator - a metering valve controlled by the controller. The latter, changing the amount of air supplied, maintains the specified idle speed. The regulator is non-separable, if it fails, it is replaced.