We independently eliminate the smell of gasoline in the cabin of the VAZ 2107

The smell of gasoline in the car is extremely unpleasant. This applies to all cars, and the VAZ 2107 is no exception. The smell is harmful not only to the driver, but also to the passengers. There are many reasons why the cabin smells of gasoline. Let's deal with the most common ones and see if they can be eliminated on our own.

Why does a car's fuel system need to be sealed?

Currently, the VAZ 2107 car has been discontinued, so now it has moved into the category of domestic automotive classics. Despite this, a lot of people drive the "sevens" in our country. The tightness of the fuel system in these machines has always left much to be desired. This applies to both early carburetor "sevens" and later injection ones.

The tightness of the VAZ 2107 fuel system is a guarantee of clean air in the cabin

Meanwhile, the fuel system of any car must be absolutely tight, and here's why:

• fuel consumption increases. It's simple: if the cabin smells of gasoline, it means that gasoline is leaking from somewhere. And the larger the leak, the more often the car owner will have to refuel;
• fire risk. If there is a high concentration of gasoline vapors in the cabin, the risk of fire is seriously increased. One random spark is enough, and the salon will be engulfed in flames. And the driver will be very lucky if he stays alive;
• harm to health. When a person inhales gasoline vapors for a long time, it does not bode well for him. This can cause nausea and dizziness. In some cases, a person may lose consciousness. In addition, the systematic inhalation of gasoline vapors can lead to the development of cancer.

Given all of the above, when the smell of gasoline in the cabin, the driver should do everything possible to eliminate this problem, no matter how insignificant it may seem.

The smell of gasoline in the interior of the injection car

As mentioned above, the VAZ 2107 was produced in two versions: injection and carburetor. Both models periodically "pleased" the owners with unpleasant odors in the cabin. First, let's deal with injection models.

Leakage of the gas line

If the gas line in the carburetor "seven" for some reason begins to leak fuel, the appearance of a gasoline smell in the cabin is inevitable. Most often this happens for the following reasons:

• problem with the fuel check valve. It is located at the back, behind the passenger seats. This valve has never been reliable, and over time it began to skip gasoline. In addition, it can simply jam in the closed position. As a result, gasoline vapors will not be able to go into the adsorber and will fill the interior of the "seven". The solution is obvious - clean or replace the check valve;
  

  Due to clogged non-return valve, the smell does not go into the adsorber
• crack in the fuel tank. Tanks on later injection "sevens" often crack. This usually happens due to mechanical damage: a strong blow or a deep scratch, which has rusted over time and began to leak gasoline. For whatever reason, a fuel leak begins, the tank will either have to be soldered or replaced. It all depends on the size of the crack and its location;
  

  The smell of gasoline in the cabin often arises from a cracked gas tank.
• problem with hoses on the fine filter. On injector “sevens”, these hoses are attached to the filter using very unreliable thin clamps, which weaken over time. Fuel begins to leak, and the cabin smells of gasoline. The best solution is to replace the standard clamps with thicker ones. The width of the clamp must be at least 1 cm. You can purchase such clamps at any parts store.

Problems with the electric fuel pump

On the latest models of injection "sevens" electric fuel pumps were installed. The main task of the pump is obvious: to supply fuel from the tank to the injector. At first glance, the appearance of an unpleasant smell in the cabin cannot be associated with a faulty pump, since this device itself is located in the fuel tank. However, there is a connection. The pump, like any other device, wears out over time. The most rapidly wearing element in this device are the gaskets. Also, do not forget that the pump is cooled by the same gasoline that it supplies to the injector.

The smell of gasoline in the cabin sometimes occurs due to overheating of the fuel pump

If the driver does not monitor the level of fuel in the tank, the pump may start to overheat, resulting in an unpleasant odor. And if the driver constantly uses low-quality gasoline, then the coarse fuel filter can become completely unusable. As a result, the smell of an overheated fuel pump can reach the cabin. Solution: remove the pump, replace the seals, replace the fuel filters and use only quality gasoline with the correct octane rating.

Poor injector adjustment and other causes

In some injection “sevens”, the smell of gasoline can be felt in the cabin immediately after starting the engine. It should be said right away that this is not always considered a malfunction. For example, on old "sevens" the smell of gasoline often appears when the driver starts a cold engine in winter, in severe frost. If such a picture is observed, the driver must take into account these points:

• a sensor that takes the temperature from the motor transmits to the electronic control unit of the "seven" data that the motor is cold;
• the block, guided by these data, creates a rich fuel mixture, simultaneously increasing the starting speed of the engine, putting it into warm-up mode;
• since the mixture is rich and the cylinders are cold, the fuel simply cannot burn completely in them. As a result, part of the gasoline ends up in the exhaust manifold, and the smell of this gasoline enters the passenger compartment.

If the injector is working, the smell of gasoline will disappear as soon as the engine warms up. If this does not happen, then there is a poor adjustment of the injector or problems with the engine. Here's what it could be:

• malfunctions in the ignition system;
• malfunctions in the injector mixture system;
• poor compression in the cylinders;
• breakdown of the oxygen sensor;
• clogging of one or more nozzles;
• air entering the injection system;
• The ECM sensor has failed.

The result in all of the above cases will be the same: incomplete combustion of the fuel, followed by the release of its residues into the exhaust system and the appearance of the smell of gasoline in the car.

The smell of gasoline in the cabin of a carbureted car

The very first "sevens" were completed only with carburetors. Due to problems with these devices, the smell of gasoline also appeared in the VAZ 2107 cabin.

Due to poor adjustment of the carburetor, the smell of gasoline may appear in the cabin

Consider the typical malfunctions of the carburetor "sevens", leading to the fact that the driver began to inhale a specific gasoline "aroma".

Fuel line leakage

Problems with various elements of the fuel line are the most common occurrence in the old "sevens":

• fuel tank leak. It was already mentioned above that in the new injector "sevens" the strength of gas tanks leaves much to be desired. In older carbureted models, the tanks were much stronger. However, the venerable age of these cars cannot be discounted. A tank, no matter how strong it is, begins to rust over time. And the older the carburetor "seven", the higher the likelihood that the tank will rust through;
• fuel tank hoses. This is another vulnerable element of the fuel line. These hoses are located under the car. They are attached with clamps to the fuel lines. Clamps are thin and narrow. Over time, they weaken, and the hoses begin to leak. As a result, fuel consumption increases, and the driver begins to breathe gasoline vapors;
• hoses on the valve for the return drain of gasoline. This valve is located in the engine compartment, next to the carburetor. The backflow hose is periodically subjected to high pressure, which can one day cause it to crack and leak. Interestingly, the clamps holding the valve almost never loosen or leak.
  

  The backflow valve on the "seven" has never been a particularly tight device

Fuel pump malfunction

In the carburetor "sevens" not electrical, but mechanical fuel pumps were installed.

On the old carburetor "sevens" there are only mechanical fuel pumps

These pumps differed in design, but they had the same set of problems as the electric pumps: early wear of the gaskets associated with overheating due to low fuel levels and clogged filters. The solution is the same: replacing filters, seals and using high-quality gasoline.

carburetor leak

There are several reasons why the carburetor in the VAZ 2107 starts to leak. But the result is always the same: the cabin smells of gasoline.

If the carburetor is set up poorly, then the cabin will certainly smell of gasoline.

Here's why it's happening:

• the carburetor on the "seven" could simply become clogged due to the use of low-quality gasoline. The solution is obvious: remove the carburetor and wash it thoroughly in kerosene;
• there was a leak at the junction of the carburetor and manifold. This is another common "disease" on the old "sevens". Either tighten the appropriate clamp or install a new one;
• float not properly adjusted. If the adjustment of the float chamber was performed incorrectly, or for some reason lost, the chamber will begin to overflow. Excess gasoline may leak out. And the driver in the cabin will immediately feel it;
• flow through the lid. This is another result of poor carburetor adjustment, only gasoline is not flowing through the float chamber, but directly through the cap. Usually this breakdown is accompanied by a violation of the tightness of the rubber seal under the cover;
• leaking carburetor fitting. This part rarely breaks, but it happens. There is only one solution here: buying and installing a new fitting. This item is not repairable.

In all of the above cases, the carburetor will have to be adjusted. Usually it all comes down to a simple idle adjustment, but this will be discussed below.

Too rich mixture

If the carburetor on the VAZ 2107 creates too rich a mixture, then the consequences will be the same as on the injection "seven". The fuel will not have time to completely burn out and will begin to enter the exhaust system. And the cabin smells of gasoline. Sooner or later, this situation will lead to the fact that the muffler on the "seven" will burn through, a thick layer of soot will appear on the pistons, and fuel consumption will increase significantly. And there is a rich mixture that's why:

• the air filter is clogged. Consequently, little air enters the carburetor and the mixture is rich. Solution: change the air filter;
  

  If the VAZ 2107 air filter is clogged, the fuel mixture will be too rich
• the air sensor has failed. As a result, the carburetor creates the mixture incorrectly. Solution: change the air sensor;
• the fuel pump is not working properly. It usually creates too high pressure in the fuel line, which ultimately leads to an enrichment of the mixture. Solution: diagnose the fuel pump and adjust it;
• Throttle valve does not move well or is very dirty. As a rule, these two points are connected: the damper first becomes dirty, and then almost does not move. Depending on the position in which the damper is stuck, the mixture may be either too lean or too rich. The second option is more common. Solution: removing and flushing the carburetor.

Injector adjustment

Adjusting the VAZ 2107 injector in a garage usually comes down to setting the idle speed controllers. This regulator is a miniature electric motor that contains a small needle. The purpose of the regulator is to receive signals from the control unit, supply air to the rail and thereby maintain optimal idle speed of the “seven” engine. If any failure occurs in this system, then the regulator should be checked.

Adjustment sequence

Before starting work, the VAZ 2107 engine must be allowed to cool. This is an important preparatory step. It takes from forty minutes to an hour (it all depends on the season).

1. Both terminals are removed from the battery. After that, the speed controller is unscrewed.
   

   If this regulator does not work properly, stable idling is not possible.
2. The hole in which this regulator is located is carefully blown with compressed air.
3. The regulator is disassembled, its main sleeve is carefully inspected for scratches, cracks and other mechanical damage. If any are found, the regulator will have to be replaced. This device cannot be repaired.
4. The second item to check is the regulator needle. It should not have any, even the most minor scuffs and wear. If there are such defects, the needle will have to be changed.
   

   All the main elements of the regulator are visible - a needle, copper windings and a guide sleeve
5. The next step is to check the regulator windings with a multimeter. It's simple: the resistance of the windings should not be zero, but should correspond to the passport values ​​(these values ​​can be specified in the car's operating instructions). If the windings are intact, the regulator is assembled and installed in place. The engine starts and runs at idle. If the engine is running normally, and there is no smell of gasoline in the cabin, the adjustment can be considered complete.

Video: how to change the idle speed controller on a VAZ 2107

How to change the idle speed regulator on the vaz-2107.

Adjusting the carburetor on the VAZ 2107

If the driver has an old carburetor "seven", then to eliminate the smell of gasoline, you will have to deal with idle speed adjustment on the carburetor. This will require a flathead screwdriver.

Adjustment sequence

1. The engine starts at idle. After that, the quality screw on the carburetor is turned clockwise with a screwdriver until the crankshaft reaches maximum speed.
2. After setting the maximum speed (they are determined by ear), the screw responsible for the amount of mixture is turned with the same screwdriver. It is necessary to achieve a situation in which the number of revolutions will be no more than 900 per minute (determined using a tachometer).
   

   When adjusting the idle speed, always adjust the quantity screw first, and then the quality screw
3. The final stage is the rotation of the screw, which is responsible for the quality of the mixture. This screw rotates clockwise until the number of revolutions reaches 780-800 per minute. If this indicator was achieved, then the carburetor adjustment can be considered successful.

Video: carburetor idle adjustment

DO IT YOURSELF. Idle adjustment!

Checking the fuel line

As mentioned above, the smell of gasoline most often occurs due to leaks in the fuel line. Therefore, the driver must be aware of the weaknesses of this design. When inspecting the fuel line, pay attention to the following:

• fuel tank integrity. For inspection, it is best to drive the car into the pit and use a powerful flashlight. There should be no drips, no dents, scratches or other mechanical damage on the tank;
• fuel line check. The fuel line is a system of hoses and tubes through which fuel is supplied from the tank to the engine. Most of this system is located on the bottom of the car. Therefore, the driver must carefully check all connections, clamps and joints of this line for leaks;
  

  All connections on the fuel line pipes should be carefully inspected at least once a month.
• connections on the fuel fine filter. A pair of short tubes is connected to the filter. These tubes, in turn, are connected to hoses. As a result, eight connections appear at once, which very often begin to leak. Therefore, immediately after inspecting the line, check the connections on the fine filter;
  

  The hoses on the "seven" fine filter have never had good tightness
• air filter. Its condition should also be checked, although it does not directly relate to the fuel line. It's simple: if the air filter is clogged, then even with a completely sealed fuel line, it will not be possible to get rid of the smell of gasoline, because the fuel mixture will be too rich due to a bad filter.

So, the smell of gasoline in the cabin of the "seven" can occur for a variety of reasons, many of which are far from always obvious. Nevertheless, the vast majority of these reasons the driver can eliminate on their own. All that is required is to simply follow the above recommendations.