Fuel system VAZ 2107 injector diagram

Fuel system VAZ 2107 injector (photo and video)

Low fuel pressure, what is the problem Injector!? VAZ The
VAZ 2107 injector power supply system has some differences from the classic carburetor. The main distinctive features are caused precisely by the fact that instead of a standard system for supplying the air-fuel mixture to the cylinders, the new VAZ 2107 models use an injector. Accordingly, other elements, such as a pump, filter, etc., differ. In addition to the indicated differences in the fuel system, the VAZ 2107 injection engine has fundamental differences in the ignition system. At the same time, the undeniable advantage of this type of engine is the presence of electronic control of all major systems. It is thanks to it that the efficiency and efficiency of the engine significantly increases.

The schematic diagram of the fuel supply system for the VAZ 2107 injector is shown in the following figure.

Here the main elements are indicated by numbers from 1 to 12:

Air intake tube. Filter for air purification. Connecting air pipe. Damper with built-in idle speed control system. Fuel injection system (injector). Filter for mechanical fuel purification. Pump with electronic fuel volume sensor (installed in the tank). Bypass valve. Safety valve. Tank.

In addition, the power supply circuit contains a system for cleaning and subsequent saturation of air with gasoline vapors, consisting of a fuel purge valve 8 and an adsorber 12. VAZ 2107 adsorber (malfunctions, disassembly, removal)

As you can see, the power supply system of the VAZ 2107 injector has a number of significant differences, therefore, the procedure for its maintenance has its own characteristics. As for the air filter, everything is exactly the same as in the case of a carburetor. The filter element is replaced during each routine maintenance.

The pump does not require special maintenance, except for cleaning the fuel strainer installed on the suction pipe. This mesh traps mechanical impurities present in gasoline poured into the tank. If the fuel pump fails, it is replaced. To do this, it is necessary to disassemble the tank, remove the entire pump assembly from it, after which the failed element is replaced. The repaired pump is installed in its regular place in the tank.

mesh filter for rough cleaning from mechanical impurities; fuel supply pump; electronic sensor for monitoring the fuel level (filled in the tank); fuel supply pipe; fuel outlet pipe; electrical connector; float.

The fuel filter is replaced periodically, in accordance with the manufacturer's recommendations. The main element is a special paper insert assembled in a metal case, and it is installed in the supply pipeline between the fuel pump and the injection system. The direction of fuel movement is indicated by an arrow on the body. For example, according to the arrows in the following photo, the pump (fuel tank) should be connected on the right side, and the ramp on the left.

The fuel injection system or fuel rail of the VAZ 2107 engine injector is designed directly to supply the mixture to the engine cylinders.

fuel injectors; feed tube; outlet tube; ramp; spool fitting for pressure control; electronic pressure regulator.

One of the main working elements of the VAZ 2107 engine injection system is the injector. It is essentially an electromechanical valve that is controlled by the engine management system. When voltage is applied, the valve opens and the mixture is injected into the cylinder through the nozzle under the pressure created by the pump. During operation, the nozzles become clogged and therefore require periodic cleaning. As a rule, injectors are cleaned during maintenance, but if engine performance deteriorates, they need to be cleaned without waiting for routine maintenance. Injectors are replaced only when they fail.

Another element of the fuel supply system of the VAZ 2107 engine injector is the throttle valve. It is with its help that the engine speed is controlled, the damper regulates the volume of intake air to prepare the combustible mixture. To prevent freezing of the insides of the damper during the cold season, it is connected to the engine cooling system.

pipe for connecting the adsorber; frame; flap; damper drive; pipe for removing crankcase gases; pipes for connecting to the cooling system; electronic damper position sensor; idle speed control element.

Another new element of the VAZ 2107 engine is the adsorber. It is designed to collect gasoline vapors when the car is idle. After starting the engine, the vapors held by the activated carbon are mixed with air, and the resulting mixture is fed through the throttle valve into the cylinders. In this air exchange scheme, among other things, the tank is involved, which is the main supplier of air saturated with fuel vapor.

In general, the nutrition scheme described above is more effective than the classic one. This is also due to the presence of an electronic engine control system, which regulates injection depending on operating mode, temperature and other factors. And if you follow the manufacturer's recommendations regarding routine maintenance, there will never be any problems with your car.

Operating principle

The fuel supply unit operates as follows:

The gas distribution mechanism drives the pump pusher through a cam.
The lever lowers, the spring compresses, and the inlet valve begins to let fuel through.
The membranes create a vacuum in the fuel pump chamber. Gasoline enters the unit through a filter from the fuel tank.
When the cam moves in the opposite direction, the spring expands.
Pressure is created in the chamber. The inlet valve closes.
Fuel is injected into the carburetor through the exhaust valve.

The process is repeated with each movement of the shaft with the eccentric.

Power supply system for the injection engine of a VAZ 2107 car

The idle speed regulator for VAZ is

– 2107 shut-off valve driven by an electric stepper motor.
The regulator is installed on the throttle body under the throttle position sensor. Based on an electronic signal from the control unit (ECU), the idle speed controller changes the cross-section of the additional supply air channel, thereby adjusting the idle speed of the crankshaft. idle speed control VAZ 2107 The gas tank
of the VAZ 2107 car is steel, leaded from the inside, welded from stamped two parts.
The gas tank is located in the trunk of the VAZ 2107 car on the right side. The filler neck of the gas tank is closed with a plug and is brought into the niche of the filler neck on the right wing. VAZ gas tank Fuel
2107 from the gas tank is supplied by a gas pump combined with a fuel level sensor.
A mesh filter is installed on the inlet pipe of the fuel pump, which traps large contaminant particles that enter the gas tank along with gasoline. car on the VAZ 2107 fuel pump is turned on by the Serviceable command. The fuel pump ECU should develop a pressure of not 3 bar, less than 2 bar (320 kPa). electric fuel pump VAZ receiving
1 – 2107 mesh filter; 2 – fuel pump; 3 – fuel level sensor indicator; 4 – supply tube; 5 – drain tube; 6 – electrical connector block; 7 – fuel pump float From the sensor, fuel flows through the fuel pipe into the fuel filter for more thorough cleaning.

Signs of malfunctions and self-diagnosis

Problems in the operation of the fuel pump can be understood by the following facts:

Fuel consumption increases.
Extraneous noise is heard at the location of the node.
A fueled car stalls after the engine starts.
Jerks in the movement of the car, a slow increase in engine speed, a prolonged reaction of the car when you press the gas pedal.
The engine starts only when the starter rotates for a long time.
The car won't start.

When you turn on the ignition on a car with an injector, you can hear the characteristic sound of an electric fuel pump, followed by its shutdown. In carburetor cars, the housing of the unit in good condition should not get hot.

You can check the operation of the entire fuel supply system in a car with a mechanical pump if the hose coming from the outlet pipe is removed and directed into a plastic bottle. Gasoline must be supplied under pressure. When the engine makes 20 rpm, the pump pumps about 1 liter of fuel.

If the electric pump is working, but the machine motor rotates unevenly, you need to check the pressure in the ramp using the following algorithm:

First remove the fuel pump fuse.
To use up the remaining fuel, we start the car.
After the car stalls, we connect a pressure gauge to the ramp by removing the plug.
We put the fuse in place and start the engine again.
We assess the pressure. It should be from 280 to 380 kPa.
When driving at a speed of 45-50 km/h, the indicators cannot deviate.

When pressure surges are present, the filter mesh must first be cleaned. To do this, the pump will have to be removed. In addition, the pump will not work well if the valves at the injectors are worn out, there is dirt in the fine filter, or the pressure regulator is faulty.

Before repairing the fuel pump, you must purchase a repair kit that matches the brand of the part.

General diagram of the electrical equipment of the VAZ 21074 injector

1. Electrical connection diagram of the wiring harness of the instrument panel assembly LADA 21074

– ignition switch unloading relay;
– relay-interrupter of direction indicators;
– windshield wiper relay;
– brake signal switch;
– switch for headlights and direction indicators;
– windshield wiper and washer switch;
– ignition switch;
– hazard warning switch;
– instrument cluster;
– rear window heating switch;
– rear fog light switch;
– external lighting switch;
– heater motor switch;
– additional resistor for the heater electric motor;
– heater electric motor;
– indicator lamp for heated rear window;
– brake fluid level warning lamp;
– instrument lighting switch;
– cigarette lighter;
- watch;
– reverse light switch;
– hand brake sensor;
– rear fog light relay;
– block of the instrument panel harness to the ignition system harness;
– glove box lighting;
– mounting block.

About the fuel pump on the VAZ2107 injector

If the car engine does not start, then various factors can be the reasons for such consequences. One of these factors may be a gas pump, the main purpose of which is to pump gasoline into the engine from the gas tank. The VAZ 2107 has an injector and a fuel pump that is much more reliable than on carburetor cars. Despite this, even on fuel-injected cars the fuel pump can fail.

Fuel pump selection

The designs of pumps for the VAZ-2107 differ from different manufacturers. Over the years of using cars, specialists and lovers of classic cars have developed their own point of view on the state of the spare parts market.

For injector

Many VAZ owners of the classic line prefer to install suitable parts from imported cars on their cars.

The fuel pump for the “seven” (21073-113909-02 VAZ-2107 engineer 7246 TSN) can be replaced, for example, with a unit from Honda Original and other brands.

Replacement numbers:

17040S50930;
17040S3A000;
17708SFB013;
17040S2R000;
17040S2K000.

The cost of analogues is often lower than the price of Russian manufacturers and higher in quality. An electric pump for Honda can be bought for 800-900 rubles, and the original unit costs 1250-1390 rubles.

For carburetor

With carburetor versions of cars, you can choose the domestic manufacturer DAAZ, a subsidiary of VAZ from the city of Dimitrovgrad. But most car enthusiasts consider PEKAR fuel pumps to be the most appropriate for the price/quality ratio.

Owners of classic VAZs note that fuel units from DAAZ differ in engineering errors - vapor locks often form, pumping does not work in cold weather, and they heat up in summer.

PEKAR pumps are more expensive - about 1000 rubles. The DAAZ product can be purchased for 600 rubles. Accordingly, the price of the repair kit also differs: PEKAR - 350 rubles, DAAZ - 120 rubles.

What is the device in question?

The fuel pump on the VAZ 2107 injector is presented in the form of an electric motor with a pump, which pumps gasoline from the tank.

The pump design has an electric motor that is powered from a 12V vehicle network. The design of the electric motor consists of a rotor, brushes and a commutator, which are constantly in gasoline. Many will think that such an injector power system for the VAZ-2107 car is quite dangerous, but not everything is so simple.

Spark and gasoline are a dangerous compound that can lead not only to fire, but also to explosion. This would happen, because sparking occurs in the electric motor of the gasoline pump, if not for the fact that gasoline belongs to the category of liquids that do not conduct electric current. In addition, gasoline does not burn if there is no air, and the fuel circuit is exclusively closed. Thus, the design of an electric fuel pump on a VAZ 2107 car is presented.

Briefly about the renovation

In the event of malfunctions in the fuel supply system, first of all, check the condition of the coarse fuel filters and the mesh filter by removing the pump cover.

At the next stage, the fuel pump in carburetor cars is disassembled and the gaskets and membranes subject to wear are replaced. It's easy to remove. You need to disconnect the hoses and unscrew 2 nuts.

The problem may also be in the intake and exhaust valves. They can be cleaned by first soaking them in a solvent, or replaced. Spare parts are included in the repair kit.

Often the fuel pressure decreases:

if the spring has weakened;
if the pusher is worn out;
if a coating of dirt has formed on the surface of the rod, cover or chamber walls.

The condition of the thermal gasket is assessed by oil drips. Their presence indicates its malfunction.

In a system with an electric gasoline supply pump, the following may also fail:

relays and fuses;
electronic control unit;
terminals;
ground wire;
alarm (power circuit is broken);
electric motor – windings, contacts, bearings.

Read, it may come in handy: Repair of VAZ 2107 starter

Before disassembling the fuel pump in an injection machine, you need to relieve the pressure in the system. To do this, you need to press the fitting, which is closed with a cap on the ramp. All manipulations should be carried out after disconnecting the battery.

Some faults can only be repaired at a service station. These include, for example, problems with the electronic control unit.