Petrol pump VAZ-2109: injector and carburetor engine

In the article will be told about the petrol pump VAZ-2109, as well as options for the execution of this unit in carburetor and injector motors. It is worth paying attention to the fact that these are completely different designs, which are not very similar. But they have the same function - to ensure a normal pressure value in the fuel injection system. So, what is the design of pumps that are used in carburetor engines? This should be discussed in more detail.

Fuel pump of carburettor system

Its body consists of two halves - the top and bottom. And below is attached a small lever, with the help of which the manual pumping of gasoline into the highway leading to the carburetor. At the same time, the VAZ-2109 petrol pump works from the camshaft. The carburetor receives fuel in small jerks, in portions. At the same time, a float chamber is filled, which acts as a buffer when the fuel is circulated. Inside the pump there is a diaphragm. It is driven by a cam, which in turn - from the camshaft by means of a steel rod. There are protrusions on the camshaft, due to which the movement of the rod is possible.

Pump Faults

There are several basic problems that are inherent in fuel pumps installed on carburetor motors. And most of the damage is associated with the diaphragm. When heated, it begins to bend much worse, therefore, there is no pumping of gasoline. The VAZ-2109 gasoline pump is quite simple. The price of it in stores is about 500 rubles. Therefore it is much easier to replace it completely than to repair it. In most cases, it turns out to be inefficient, since the quality of the items included in the repair kit is often extremely low. But the rod often fails. It is made of steel, but only manufacturers do not particularly think about quality, do not harden it. Consequently, very rapid wear occurs.

Injection motor fuel pump

It has a slightly different design, since it has an electric drive. Place of installation of the fuel pump - in the tank, under the rear seat you can get access to it. Drive electric, at the feet of the passenger in the front seat is the fuse and relay of the petrol pump VAZ-2109. In the event that when the ignition is switched off, the characteristic sound of starting the motor is not audible, first of all check the integrity of the relay and the fuse. And only after that you can make your way further - to the wiring and the petrol pump itself. The latter is a small pump with a filter (it is also called in the people "pampers"), as well as an electric motor that drives the entire structure. Pay attention to the fact that there are two mains laid to the tank - one for feeding fuel to the ramp, and the second - for the return of excess gasoline. Needless to say, the requirements for the mains are different - the return must withstand less pressure.

Replacement and repair of the injector pump

To access the installation site of this fuel system element , you will need to tilt the bottom of the rear seat. To do this, it is enough to open the doors slightly and pull the loop, which is approximately in the middle of the seat. Closer to the right door is the installation site. You will see it right away, because in the carpet and noise insulation there will be a cutout. A piece of cover is removed to the side and remove the plastic cover. Below it are studs, to which the pump housing is assembled with a level sensor.

Using a key on 8, it is necessary to unscrew all nuts and carefully remove the washers. Please note that before that, it is desirable to clean the entire top of the tank from dust and dirt, which is visible from under the carpet. Then it is necessary to dismantle the two hoses that are connected to the pump. Only after that, carefully, trying not to damage the fuel level sensor, take out the petrol pump VAZ-2109. Similar actions are performed when replacing the gasoline cleaning filter. To check the efficiency of the motor, it is necessary to apply voltage directly to it (short-term). This will tell you that the engine is in good condition. If it does not rotate, it is best to replace it.