Description of the design. Design description Fuel tank for VAZ 2104

In order to replace the gas tank in VAZ 2104, 21041 and 21043 car models, you need to do the following:

— Relieve the pressure in your engine's power supply system. After this, disconnect the negative wire on the battery. Using a specialized hose, pump gasoline out of your car's gas tank.

— Remove the rubber apron from the neck of the gas tank. Bend the right edge of the mat in the trunk of the car, and then remove the piston from there. Remove the trim from the gas tank and unscrew the four mounting bolts. Unscrew the bolt that secures the gas tank.

— Unscrew the tubes: drain and supply. They are located near the car engine. Now you can freely remove the gas tank from the car.

After this, you need to diagnose the gas tank for damage, as well as various types of contaminants. Rinse the gas tank with gasoline to remove all dirt. After this, rinse it with hot water and inspect it for damage. If any are found, you can eliminate them using soft solder. However, make sure that there is no gasoline left on it, otherwise it may catch fire.

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The power supply system consists of a fuel tank with a level indicator and fuel reserve sensor, fuel lines, fuel pump, air filter and carburetor.

Fuel tank welded from two halves stamped from leaded steel sheet. The outside of the tank is painted with black enamel.

The VAZ-2104 has a 42-liter fuel tank, which is located under the floor luggage compartment From the left side. Tank filler neck

placed in a niche on the left rear wing. The tank is attached to the underbody with four bolts. For ventilation, the fuel tank has a hose leading into the niche of the filler neck. Installed on top of the tank through a sealing gasket level indicator and fuel reserve sensor. The sensor displays data on the remaining fuel in the tank on the instrument panel. When 4.0-6.5 liters of fuel remain, the instrument panel lights up warning lamp. Fuel lines made of galvanized steel tubes and secured from below to the bottom of the body with holders. Details fuel system connected to each other by rubber hoses secured with clamps.

The fuel pump is a diaphragm type, with a mechanical drive and a 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 drive shaft of auxiliary units or from a manual pumping lever. Pump capacity of at least 60 l/h with a swing frequency of 2000 cycles per minute. The pressure created by the pump is in the range of 0.20-0.30 kgf/cm². The pump consists of a lower housing with drive levers, an upper housing with inlet and discharge valves, a diaphragm assembly and a cover. The diaphragm assembly has two upper working and one lower (safety) diaphragms installed on the rod. Internal and external spacers are installed between the workers and the safety gasket. 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 outer gasket for draining fuel.

The air filter is 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 secured with self-locking nuts. The top of the filter housing is closed with a lid with a rubber seal. Installed in the air duct in front of the air filter housing thermostat, allowing you to change the temperature of the incoming air. Depending on one of the three positions of the thermostat damper, air is drawn through the warm or cold air intake or from both at the same time. The damper position is set manually according to the ambient temperature. The air filter housing is connected by a crankcase gas supply hose to the oil separator cover of the crankcase ventilation system. A flame arrester is installed in the crankcase gas supply hose.

The car is equipped with a carburetor model 2107-1107010.

The carburetor is emulsion type, two-chamber, with falling flow. The combustible mixture is formed from the air entering through air filter air and fuel supplied by the pump. This ensures an uninterrupted supply of the combustible mixture 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 housing throttle valves.

The carburetor is mounted on four studs in the intake manifold. The carburetor cover contains the inlet necks of the primary and secondary mixing chambers, the fuel supply fitting from the fuel pump, fuel and air channels. A fuel supply needle valve and a float are also attached to the cover, ensuring required level fuel in the float chamber. The carburetor body has large diffusers and float chamber. Inside the large diffusers there are removable small diffusers, cast integrally with the econostat sprayers and the main dosing systems. The carburetor body has air and fuel channels, air and fuel jets and an accelerator pump nozzle are installed.

The accelerator pump supplies additional fuel to the primary mixing chamber when the gas pedal is pressed sharply. The diaphragm type pump is made in a casing boss and is closed with a cover secured with four screws. The pump diaphragm is moved by a lever. To ensure smooth operation and, accordingly, smooth and long-lasting injection, a damping spring is installed in the telescopic diaphragm cup. The accelerator pump lever is driven by a cam mounted on the throttle axis of the primary chamber.

The throttle body is attached to the bottom of the carburetor body with two screws. It has rotary throttle valves installed on the axles in the primary and secondary mixing chambers. The throttle valve of the primary chamber is driven mechanically through a system of adjustable rods from the gas pedal. The secondary chamber throttle valve drive is pneumatic. 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 axis. The pneumatic drive begins to open it when the throttle valve of the primary chamber is deflected at an angle of more than 48° and a vacuum is created in the mixing chambers sufficient to open the valve.

To start and operate the engine when warming 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 starter housing is secured with two screws to the carburetor cover. The diaphragm rod of the starter drive is connected by a rod to the choke lever. The cavity of the starting device is connected by an air channel to the primary mixing chamber. When the engine starts, a vacuum is created in the cavity. The diaphragm rod presses return spring, affects traction and opens the air damper.

The idle speed is adjusted using the screws for the composition (quality) and quantity of the mixture. The composition adjustment screw is installed in the boss hole of the throttle body and is closed with a plug. The screw for adjusting the amount of mixture is installed in the economizer cover.

On a VAZ-21047 car, the fuel tank is installed under the luggage compartment floor on the left side.
It is more convenient to change the tank with an assistant, placing the car on an inspection ditch or overpass.

Using a fuel transfer hose, we pump gasoline out of the tank through filler neck.

Using a Phillips screwdriver, unscrew the two screws securing the hatch cover.

There is a rubber sealing gasket installed under the hatch cover.

Use a Phillips screwdriver to loosen the clamp and remove the fuel hose from the fuel intake pipe.

To prevent fuel from leaking out of the hose, insert an M8 bolt into it and tighten the clamp.

We remove the wire tips from the sensor terminals, having previously remembered or marked the order of their connection.

Now you can remove the fuel gauge sensor or dismantle the tank.

Using the “8” head, unscrew the self-tapping screw securing the protective casing of the fuel tank pipe to the side member.

Using a 10mm wrench, unscrew the two bolts securing the casing to the rear wheel arch.

We remove the casing.

Loosen the clamp and remove the hose from the filler pipe. To prevent fuel from spilling out when removing the tank...

Bend the fuel hose and tie it with a cord

Remove the tank ventilation hose from the filler pipe.

Place the stop under the tank and use a 13mm wrench to unscrew the four nuts securing it.

Lowering the tank, remove the ventilation hose from the fender hole.

We remove the tank...

Leading the ventilation hose out of the hole in the side member...

Install the tank in the reverse order of removal. Before installing the protective casing, fill the tank with fuel. We check the tightness of the connections and tighten the clamps if necessary.

An assistant will be required to carry out the work of removing the tank.

1. Place the car on an inspection hole or overpass (see "Preparing the car for maintenance and repair").

2. Relieve the pressure in the power system (see "Relieving pressure in the power system").

3. Disconnect the wire from the negative terminal of the battery (see " Accumulator battery- removal and installation").

4. Use a special hose (see “Tools, accessories and operating materials”) to pump out fuel through the filler neck of the tank.

5. Having folded the mat on the left side of the luggage compartment, use a Phillips screwdriver to unscrew the two screws securing the hatch cover and remove it.

6. Disconnect the wiring harness block from the electric fuel pump block.

7. Using a Phillips screwdriver, unscrew the self-tapping screw securing the luggage compartment upholstery on the left side and remove the upholstery (see “Rear bumper - removal and installation”). Using the same tool, loosen the clamp securing the tank ventilation hose and remove the hose from the filler pipe fitting.

8. Under the car with a socket wrench on 10 mm Unscrew the self-tapping screw of the rear fastening of the fuel tank pipe casing to the side member.

9. Using the same tool, unscrew the two bolts securing the casing to the rear wheel arch.

10. Remove the casing.

11. Having loosened the clamp securing the tank pipe to the filler pipe, remove the pipe.

Attention!

12. Key by 17 mm unscrew the fitting of the electric fuel pump tube, holding the hose tip with a wrench of the same size. The tips of the drain and supply tubes are sealed with rubber rings.

13. Drain the remaining fuel into the prepared container.

Similarly, we disconnect the other fuel line and drain the fuel from it.

14. Place a jack under the tank and use a socket wrench by 13 mm Using an extension, unscrew the four nuts securing the fuel tank.

15. Lowering the tank, remove the ventilation hose from the hole in the side member.

Installation

1. Install the fuel tank in reverse order.

2. Raise the tank with a jack, while an assistant pulls out (from the luggage compartment side) the ventilation hose from the hole in the side member.

3. Fill the tank with fuel, turn on the ignition to create pressure in the power system and check the tightness of the connections.