VAZ-2114 gasoline pump: the principle of operation, device, circuit and typical breakdowns

In modern cars, and VAZ-2114 is exactly what it is, instead of a carburetor power supply system, an injector is installed. Also, the machine is equipped with a modern injector engine. Another important device in the power supply system of the VAZ-2114 car is a gasoline pump. This pump is located in the fuel tank. The main task of this equipment is to create working pressure in the power system. It can reach 8 atmospheres, but most often the fuel is pumped at a pressure of 300-400 kPa. With regard to performance, this equipment can pump up to 80 liters of fuel per hour.

Like all other systems in the car VAZ-2114, the gasoline pump can fail. As for the service life, it can vary significantly, because the quality of fuel affects it very much. Consider its device, the principle of operation, as well as typical faults and methods of repair and replacement.

How is the fuel system VAZ-2114

The power system includes a fuel module, lines, as well as filters and injectors. The fuel module includes the pump itself, the level sensors, the float, and also the primary fuel filter grids.

The grid of the gasoline pump VAZ-2114 is located in the suction pipe. It has a fine mesh structure, due to this it detains large contamination, which can damage the pump parts and power systems.

Construction of the gasoline pump

As for the element itself, it is of the membrane type. The principle of its operation is based on an electric drive. Power to the motor is provided by the vehicle network. The main component is a special membrane, which can perform reciprocating movements during the operation of the motor.

The assembly of a diaphragm system or a hydrocharger necessarily has a safety valve in its design , which serves to relieve pressure. There is also a check valve located in the outlet of the device. It is necessary in order to prevent fuel from penetrating from the power supply system into the tank. In addition, it maintains pressure in the system when the pump is turned off.

With regard to the principle of operation of the mechanical hydrocharger, they are divided into centrifugal and volumetric pumps. The first can be a turbine type, where the working part is similar to an impeller with a huge number of blades. The second can be gear or roller type.

In the car VAZ-2114 the gasoline pump is constantly washed with a flammable liquid, even if there is not much fuel in the tank. This design is used to ensure that the electric motor is cooled, because in the process of work it gets quite heated.

Principle of operation

So, the petrol pump VAZ-2114 injector - it's nothing like a small electric motor, which pumping fuel and creating the necessary level of pressure in the fuel rail and fuel system.

At the moment when the ignition is switched on, a signal to this element comes from the ECU. Then the device receives electric current. The first few seconds the motor rotates (this is necessary in order to create the necessary working pressure). It is interesting that if within two to three seconds the on-board computer does not receive any data from the pump, it turns off the electric motor. This is done to ensure safety.

You can hear how the fuel pump works in the first seconds after starting the engine. So, through the tube fuel is sucked directly into the pump, and then it is withdrawn by means of a one-way valve. Next, the gas passes through the filter, and then into the engine. That's how the petrol pump VAZ-2114 works. The scheme is quite simple. The electric motor of the fuel pump will only be started if the car engine is running.

Typical malfunctions, their signs

VAZ-2114 is a special car, the purchase of which does not require large budgets. Also inexpensive will be the owner and service. And even if the maintenance of some foreign cars is cheaper, then the spare parts for VAZ will be found faster and easier in any stores, even in the most remote areas. A common problem in the car VAZ-2114 - a gasoline pump. He does not pump fuel.

Here, for example, a typical situation - the engine stalled. When you try to start a car, it either does not start at all, or starts and even rides, but after a couple of meters again stalls. After checking the battery, only the gasoline pump remains. Consider the most typical faults of this node and learn how to eliminate the breakdown.

Signs of breakdowns

The first sign, which reports that the pump does not work, is the banal failure of the engine to start. Naturally, if the engine does not work, anything can happen, but more often after checking the candles and the computer, the pump is still faulty.

Another point is the pressure in the fuel system. When the device is in order, then in the trunk will be 3.2 bar. On the fuel rail on a 1.5-liter engine, the pressure level will be from 285 kPa to 325, on a 1.6-liter engine - from 375 to 390 kPa.

Also often happens such situation when the pump does not receive a signal after ignition inclusion. Usually, the driver hears a slight vibration, which indicates a normally functioning device, but in this case there is no vibration. The most common problem here is wiring. The engine can jerk even before the start or just at low speed. The pump itself or the coarse filter screen does not function here.

All these problems can be corrected. Do not immediately run to the nearest store. The replacement of the VAZ-2114 gasoline pump will cost from 2000 rubles when buying a whole module or 1000 rubles when purchasing only a pump. Among the reasons can also be a fuse, a relay, an unreliable mass, an electric motor, contacts.

Pressure system

The pump is known to be needed to create pressure in the fuel system. To make the correct diagnosis or exclude the pump altogether, it is necessary to perform pressure measurements. So, the normal idling pressure is 2.6 atmospheres, with the ignition on, 3, without the regulator tube 3.3, with the clogged overflow 7. With the gas pedal pressed, the normal pressure will be 3 to 2.5 atm . Measurements are made in these states with a manometer whose range is small. Under the hood there is a choke, a manometer is attached to it.

If, when the ignition is switched on, the needle of the manometer is near zero, then the pressure regulator is broken. At gas pressure, the arrow is near zero - the petrol pump is faulty. When it gently creeps upwards, it is worth to look at the condition of the VAZ-2114 petrol pump filter.

Wiring harnesses

The device comes three wires. This positive cord, respectively, is negative and the wire is a fuel level sensor. One of the reasons that the pump refuses to work is a power failure. After pressure, it is worth checking the contacts.

You can do it with a light bulb. It is fixed on the wires and fixed to the external connector of the pump. After switching on the ignition, the bulb should blink. If it still does not work, check the internal contacts.

If, when testing external contacts, the lamp does not light, then in turn connect the negative and positive contacts that are disconnected from the pump, to the mass on the device, and then to the relay of the petrol pump VAZ-2114. When the negative contact is connected to the ground and the light blinks, the contact is defective. If not, the positive contact does not work. If the contact is on the relay, and the lamp is on, then it is worth checking the wiring from the pump to the relay.

Electromotor

For verification, you will need the same light bulb. The wires are fixed to one of the motor terminals and turn on the ignition. If the bulb is on fire and goes out, then it is necessary to replace the electric motor.

Weight

If the contacts are all right, then you should check the state of the mass. It may not be securely attached. It is fixed in the area of the handbrake, under the torpedo. For inspection and repair, remove the plastic part under the hand brake, remove the floor covering. Then clean and firmly connect the mass with the pump.

Relay

Wherever there is mass, there is a relay. In an ideal situation, at the moment of ignition, this element starts the pump in a few seconds and turns off. If the pressure level is normal and the relay does not work properly, then you need to remove the front panel that closes the sound contacts. From the passenger side you can see three devices. The bottom one is the relay. If the relay clicks when you turn the key, then it works. Otherwise it is better to replace it. It is not expensive.

Fuse

This is the final stage of diagnosis. For those who do not know where the VAZ-2114 petrol pump fuse is located, it is located in the same place as the relay. You can see it from the salon. It's best to get to him through the hood.

So, under the hood, near the windshield is a box. It must be opened and the upper fuse to be found. The current strength is 15 A. Also on it it is written that it is for the fuel ramp. If the contact of the fuse is complete, then it is alive. If the contact is not in order, the fuse must be replaced.

These typical faults have this node and in such a manner as described above, it can be diagnosed.