Fuel tank the 39-liter tank is welded from two halves stamped from leaded sheet steel and painted black on the outside. The tank is located in the trunk on the right side in the direction of travel and is attached to the body with a clamp tightened with a bolt. The filler neck of the tank is brought out to a niche on the right rear wing and closed with a threaded plug. For ventilation, the fuel tank has a hose that is brought out to the niche of the filler neck. A fuel level indicator and fuel reserve sensor is installed on top of the tank through a sealing gasket. The sensor sends data on the remaining fuel in the tank to the instrument panel. When the remaining fuel is 4.0-6.5 liters, a control lamp lights up on the instrument panel.
Fuel lines are made of galvanized steel tubes and are secured to the bottom of the body with holders. The fuel system components are connected to each other with rubber hoses secured with clamps.
Fuel pump - diaphragm type, with mechanical drive and manual pumping lever. The pump is located on the left side of the cylinder block and is secured through a heat-insulating spacer and gaskets on two studs with nuts. The pump is driven through a pusher from an eccentric on the auxiliary drive shaft or from a manual pumping lever. The pump capacity is at least 60 l/h at a pumping frequency of 2000 cycles per minute. The pressure generated by the pump is within 0.2-0.3 kgf/cm². The pump consists of a lower casing with drive levers, an upper casing with inlet and discharge valves, a diaphragm unit and a cover. The diaphragm unit has two upper working and one lower (safety) diaphragms mounted on the rod. Between the working and safety gaskets, internal and external spacer gaskets are installed. In order to prevent fuel from entering the engine crankcase in the event of damage to the working diaphragms of the fuel pump, a hole is made in the external gasket for draining fuel.
Fuel pump parts: 1 - lower body; 2 - return spring; 3 - rod; 4 - diaphragm assembly plate; 5 - safety diaphragm; 6 - internal spacer gasket; 7 - working diaphragms; 8 - external spacer gasket; 9 - pump cover; 10 - mesh filter; 11 - upper body
Air filter - dry, with a replaceable filter element that cleans the air entering the carburetor. The filter housing is installed on the carburetor cover through a rubber gasket with spacer bushings on four studs and is secured with self-locking nuts. The filter housing is closed from above with a cover with a rubber sealing gasket. Air enters the air filter housing through the cold air intake or through a branch pipe connected by a corrugated hose to the warm air intake, from the exhaust manifold area. Air flow through the air intake or branch pipe is blocked by a partition A, fixed to the lid.
Depending on the season, the lid is moved to the desired position (in summer the flow of warm air is blocked, in winter - cold air).
The air filter housing is connected by a crankcase gas supply hose to the oil separator cover of the crankcase ventilation exhaust system. A flame arrester is installed in the crankcase gas supply hose.
On cars with engines of models 2106 and 2103 installed carburetor 2107-1107010-20. On cars with engine model 21011 is installed carburetor 2105-1107010-20 without electromagnetic shut-off valve.
Carburetor 2107-1107010-20: 1 - secondary chamber throttle valve pneumatic drive rod; 2 - pneumatic drive of the secondary chamber throttle valve; 3 - bolt for fastening the air damper drive rod casing; 4 - air filter housing mounting studs; 5 - coupling with screw for fastening the air damper drive rod; 6 - air damper; 7 - diaphragm rod of the starting device; 8 - electromagnetic valve; 9 - starting device; 10 - nipple for supplying vacuum to the vacuum regulator of the ignition distributor; 11 - quality screw holder; 12 - telescopic rod; 13 - crankcase gas outlet pipe; 14 - primary chamber throttle valve axis; 15 - return spring for locking the opening of the secondary chamber flap; 16 - secondary chamber throttle valve axis
The carburetor is an emulsion type, two-chamber, with a falling flow. The combustible mixture is formed from the air coming through the air filter and the fuel supplied by the pump. This ensures an uninterrupted supply of the combustible mixture of the optimal composition in all engine operating modes. The prepared mixture is sucked through the intake manifold into the engine cylinders. The carburetor consists of three body parts: the cover, the carburetor body and the throttle body.
The carburetor is mounted on four studs of the intake manifold. The carburetor cover contains the inlet necks of the primary and secondary mixing chambers, the fuel supply nipple from the fuel pump, and the fuel and air channels. The cover also contains a fuel supply needle valve and a float, which provide the required fuel level in the float chamber. The carburetor body contains large diffusers and a float chamber.
The carburetor body contains air and fuel channels, air and fuel jets, an accelerator pump sprayer and an electromagnetic shut-off valve. The electromagnetic valve shuts off the fuel supply through the idle system when the ignition is turned off.
(The article is copied from the website VAZBOOK.RU)
Carburetor cover and body 2107-1107010-20: 1 - throttle body; 2 - heat-insulating spacer; 3 - secondary chamber transition system fuel jet housing; 4 - carburetor body; 5 - carburetor fuel filter plug; 6 - fuel nipple; 7 - needle valve body; 8 - float; 9 - gasket; 10 - carburetor cover; 11 - air damper lever; 12 - a rod connecting the air damper lever with the diaphragm rod of the starting device; 13 - throttle valve connection rod with starting device drive; 14 - lever limiting the opening of the secondary chamber throttle valve; 15 - throttle valve drive lever; 16 - primary chamber throttle valve; 17 - secondary chamber throttle valve; 18 - throttle body mounting screw; 19 - accelerator pump drive cam
The accelerator pump supplies an additional portion of fuel to the primary mixing chamber when the accelerator pedal is pressed sharply. The diaphragm-type pump is made in the lug of the housing and is closed with a cover secured with four screws. The pump diaphragm is moved by a lever. To ensure smooth running and, accordingly, smooth and prolonged injection, a damping spring is installed in the telescopic cup of the diaphragm. The accelerator pump lever is driven from a cam secured to the axis of the primary chamber throttle valve.
Carburetor body 2107-1107010-20: 1 - electromagnetic valve; 2 - small diffuser of the primary chamber; 3 - three-arm lever; 4 - accelerator pump sprayer; 5 - small diffuser of the secondary chamber; 6 - secondary chamber main air jet; 7 - main air jet of the primary chamber; 8 - secondary chamber main fuel jet; 9 - main fuel jet of the primary chamber; 10 - adjusting screw for fuel supply by accelerator pump; 11 - accelerator pump cover; 12 - adjusting screw for idle mixture composition (quality); 13 - nipple for supplying vacuum to the vacuum regulator of the ignition distributor; 14 - idle mixture quantity adjusting screw
The throttle valve housing is attached to the carburetor body from below with two screws. Rotary throttle valves are mounted on axles in the primary and secondary mixing chambers. The primary chamber throttle valve is driven mechanically through a system of adjustable rods from the gas pedal. The secondary chamber throttle valve is driven pneumatically. The drive housing, with a diaphragm and a return spring, is secured to the carburetor body with two screws. The drive rod is pivotally connected to the lever on the secondary chamber throttle valve axle. The pneumatic drive begins to open it when the primary chamber throttle valve is deflected by an angle greater than 48° and a vacuum is created in the mixing chambers sufficient to open the valve.
To start and operate the engine during warm-up, the carburetor has a starting device and an air damper. The air damper is mounted on an axis in the inlet neck of the primary chamber of the carburetor cover. The damper is driven from the driver's seat by a cable from the control handle. The body of the starting device is attached to the carburetor cover with two screws. The diaphragm rod of the starting device drive is connected by a rod to the air damper lever. The cavity of the starting device is connected by an air channel to the primary mixing chamber. When the engine is started, a vacuum is created in the cavity. The diaphragm rod presses the return spring, acts on the rod and slightly opens the air damper. Idle speed is adjusted by screws of the composition (quality) and quantity of the mixture.
Carburetor 21053-1107010: 1 - carburetor heating unit; 2 - crankcase gas supply nipple; 3 - starter cover; 4 - electromagnetic valve; 5 - fuel supply pipe; 6 - bracket for fastening the air damper drive rod casing; 7 - air damper control lever; 8 - throttle control lever; 9 - air damper drive rod mounting bushing; 10 - adjusting screw for idle mixture composition (quality); 11 - idle mixture quantity adjusting screw; 12 - electric wire of the idle speed limit switch
On a car with a contactless ignition system, it is installed carburetor 21053-1107010, equipped with a forced idle economizer system (FIES). The FIES system includes a limit switch installed on the idle mixture quantity adjustment screw, an electromagnetic valve, and an electronic control unit (see "Electrical diagrams"). This system shuts off the fuel supply through the idle system at forced engine idle (with the gas pedal released and the engine speed above 1900 rpm).