Petrol pump VAZ 2112: overview, features, device and replacement

As you know, the engine needs oxygen and fuel. And if only atmospheric pressure is needed to supply the first, then the fuel must be forced by means of a pump. It can be of different types. Previously, carburetor cars put mechanical elements. The VAZ-2112 petrol pump is more modern, electric. How is it arranged and how to replace it? About all this - later in our article.

Device

The design of this element assumes the following details:

• The inlet valve.
• Cameras.
• Exhaust and solenoid valve.
• Diaphragms.
• The core.
• Electrical contacts.
• The return spring.

Principle of operation

The operation of the element is practically the same as that of the mechanical pump. So, the element acts due to the core, which is drawn into the solenoid valve. This action occurs until the system disconnects the contacts to supply power to the network. The element starts when the ignition is switched on (turning the key to the appropriate position). So, for a petrol pump VAZ-2112 16 valves 12V power is supplied. The mechanism creates in a couple of seconds the necessary pressure necessary to inject fuel into the injectors. Note that, for safety reasons, the pump can automatically shut down if the control unit does not receive a signal that the engine has been successfully started.

At the output, this indicator (pressure) reaches 0.4 MPa. The very construction of the element is modular. In addition to the pump, the assembly has a counter-cup, wires and tubes protected by a solid spring.

The pump itself has a diaphragm moving down and up. As a result, the system creates a vacuum. This helps to open the pump suction valve. When the diaphragm moves upwards, the inlet valve closes under pressure. In this case, the pumping element is opened. He pushes the fuel under pressure further on the nozzles. Also, the system provides a "reverse". It serves to burn unnecessary volume of fuel back into the tank. For the "return" are provided separate highways.

Where is?

On the first models of the "dozen" this pump was mechanical and was located in the engine compartment. But the "twelve" appeared a little later, in the 98th and was already equipped with fully injected engines with distributed injection. Therefore, the design uses a submersible electric gasoline pump. At the VAZ-2112, the injector (16 and 8 valves) is in the tank. To be more precise, the element is located under the pillow of the rear row, on the right side. For its convenient maintenance a special hatch is provided. Why could not the element be placed according to the classical scheme? The fact is that the electric pump operates at a higher pressure and heats up quickly. Therefore, he needs a cooler. In order not to complicate the design of the new radiator, engineers decided to place the element in the tank. Thus, the gasoline itself is the pump cooler. In addition, in the tank all the noises that arise from his work are muffled.

Symptoms of a malfunction

It is worth noting that the gasoline pump, installed on the VAZ-2112 injector, has a high resource. But regular driving on an empty tank and untimely replacement of filters can aggravate its operation. Therefore, you need to know the main signs of its malfunction.

The first characteristic symptom is the difficult start of the motor. And, this can happen both "hot" and "cold". This indicates that the pump is difficult to develop sufficient pressure before starting. Ideally, this takes only 2-3 seconds. If the pump continues to buzz, then there are problems with the valves or diaphragm. The second sign is the characteristic behavior of the car. The car will react with delay to the gas pedal. There will be dips during overclocking. Sometimes there are jerks just in motion on stable turns.

In more neglected situations, the machine may simply go deaf. If you have not an empty tank and the car suddenly died down, it means that the engine stopped gasoline. In this case, it is necessary to replace the petrol pump relay on the VAZ-2112 or the immersion element itself.

And finally, the engine will be unstable to work at idle. There is a feeling that the motor is hurting. If the element is completely burned, then when the ignition is switched on, there will be no pump hum (even a short-term one).

Replacement

So, we burned the pump, we bought a new one and want to install it. First, we need to reduce the pressure in the system (so as not to fill the entire cabin with gasoline from the pipes). To do this, you need to find the appropriate fuse (the diagram is indicated on the back of the cover), start the motor and remove the element during its operation. The machine will work for a couple of seconds, and then it stalls. This is a sign that the gasoline in the system has run out, and we can proceed with further action. So, open the back door and remove the sofa. For this, we press from both sides on the latches under the carpet. Then we will see a small hatch. Below him, the petrol pump VAZ-2112 hides. Using a screwdriver, unscrew a pair of screws and remove the cover to the side. Then unscrew the bolts around the perimeter of the pump with the spanner or the head with a ratchet. There are 8 of them.

How is the petrol pump replaced with VAZ-2112? The next step is to disconnect the fuel pipes. Depending on the type of motor (8- or 16-valve), they can be attached to the chips, or tightened on bolts. Also turn off the chip with wires. For a better seal, there is a rubber ring in the modular design. We also extract it. It is important to inspect his condition. If it is dry and in cracks, it is advisable to replace it. Otherwise, all the gasoline vapor that is in the tank will leak into the interior.

Installation

So, carefully remove the structure from the tank. To dismantle the old element, you need to remove the counter-cup. The pump itself is tight in the grooves on the latches. To remove it, you do not need to use keys or other equipment. It is easy enough to pull a hand and remove it from the seat. Also replace the mesh (coarse filter). Then install the new element in the same slots and do not forget to put on the plastic cup. Gently put everything in the tank and screw it on the bolts, sealing everything with an elastic band. This completes the whole replacement.

Cost

The price for new VAZ-2112 gasoline pump is from 1200 to 2000 rubles. What is noteworthy, the cheapest was the "Boschevsky" element. Of course, no one in Germany will make pumps for the "twelve". This is a cheap Chinese counterfeit. Therefore, it is better to buy a Saratov pump. It will last much longer than its counterpart. Also note that most items are already sold in the module (in collection with all tubes, filters, glasses, etc.). This significantly speeds up the replacement process.

Helpful advice

Making the replacement of the gasoline pump on VAZ-2112, ensure the maximum cleanliness of the lid of the element. It is inadmissible that dirt from it gets into the tank. It can easily clog the coarse filter (partially get into the new VAZ-2112 gasoline pump), because of which we will have to repair again. Clean up with a piece of rag, previously dampened in gasoline or "White Spirit".

Conclusion

So, we found out what to do, if the petrol pump does not work on the VAZ-2112 car and on what grounds to determine the malfunction of this mechanism. As you can see, you can change the element yourself with a minimal set of tools. To replace the gasoline pump you will take no more than 40 minutes of time. This is a simple procedure, which even novices can repeat.