Gasoline does not flow into the chainsaw

Common problems with the supply of gasoline to the internal combustion engine

• If you exclude leaks, the next reason why gasoline is not supplied to the engine is various problems with the gas pump. Note that on cars with a carburetor there is a mechanical-type fuel pump and is located in the engine compartment.

At the same time, an electric fuel pump is installed on injection engines. The specified pump is located directly in the fuel tank. If we talk about a mechanical device, then often damage to the membranes, as well as overheating, leads to its breakdown or incorrect operation.

We add that if the device is not able to create the required pressure in the fuel system (pressure is absent or low), then the injectors on some internal combustion engines may not open, the engine in this case will not start. In other cases, the injectors still open, but there is still not enough fuel. In this case, the unit starts to work intermittently, stalls in different modes, etc.

At the initial stage, it is necessary to measure the fuel pressure in the fuel rail of the injection engine, while not forgetting about possible problems with the rail pressure regulator.

• Another problem that prevents fuel from entering the engine cylinders is fouling of the fuel system filters. On the injector, in addition to the usual fuel filter, there is also a fuel pump mesh, while in the case of severe contamination of the fuel pump mesh filter, the performance of the device significantly decreases.

To avoid the above problems, the filters must be changed in a timely manner on both the carburetor and the injection engine. You also need to remember that the filter mesh on the fuel pump needs to be periodically cleaned or completely replaced with a new one every 50-60 thousand km. mileage.

• The list of possible reasons for the disruption of fuel supply to the engine is completed by contamination of the carburetor or injection nozzles, as well as the failure of individual elements. As a rule, the jets in the carburetor can become clogged, and the nozzles in the injector device are prone to contamination. Also, debris and sediments can partially or completely block thin channels, etc.

To prevent this from happening, the injector must be periodically cleaned using one of the available methods (ultrasound, special cleaners on the stand, etc.). It should also be added that the carburetor may require cleaning, repair or separate adjustment. For example, an insufficient amount of gasoline in the float chamber will lead to the fact that there is not enough fuel for the normal operation of the internal combustion engine.

Gasoline engine does not receive fuel: injector and carburetor

Let’s start with the fact that during the operation of the car, drivers often encounter the fact that the engine does not start, runs intermittently, or suddenly stalls. In this case, usually diagnostics affects the ignition system (on gasoline cars) and the power system.

As practice shows, the unstable operation of the power unit on gasoline cars in many cases is due to the fact that no gasoline is supplied to the engine. In this article we will talk about why this happens, as well as what the driver should do if there is no gasoline entering the engine.

For what reasons, fuel is not supplied to the cylinders

So, the general scheme of operation of the power system involves taking fuel from the gas tank, after which the fuel enters the carburetor or injector.

Next, the fuel is supplied to the intake manifold, then the fuel-air mixture through the intake valves enters the combustion chamber.

What is the bottom line

As you can see, if you have certain skills and knowledge, you can determine why gasoline is not supplied to the engine both on engines with a carburetor and on injection power units. over, many problems can be solved by yourself. For example, it is quite possible to repair, clean and adjust the carburetor in a garage. The same can be said for DIY nozzle cleaning.

Finally, I would like to note that the timely replacement of fuel filters, regular cleaning of the injector or carburetor, as well as driving on good quality fuel are the key to the proper operation of the power supply system of a gasoline or diesel engine.

Also, driving with a half-empty tank in winter leads to the active formation of condensation, which accumulates in the gas tank. As a result, condensate (water) not only settles at the bottom and enters the combustion chamber, but also causes severe corrosion of the tank walls. As a result, rust appears in the tank, and in the case of perforating corrosion, active fuel leaks inevitably occur.

Diagnostics of faults that may indicate problems with the gasoline pump. Self-check of the device, measuring the pressure in the fuel rail.

How to determine why the gas pump does not pump or does not work well. Fuel rail pressure, pump diagonal. Wiring, relays, fuel pump fuses.

Why is it necessary to clean the fuel pump mesh. When is it better to change and how to clean the fuel pump mesh. How to properly remove a gas pump, subtleties and nuances.

Causes of whistling and increased noise during the operation of the fuel pump, pump overheating. How to diagnose and fix the breakdown yourself. Tips & Tricks.

Airing the diesel fuel system: signs of malfunction and diagnostics. How to find an air leak on your own, ways to solve the problem.

Air filter

If the chainsaw does not supply gas to the carburetor, pay attention to the type of air filter. Due to its inadequate operation, the unstable operation of the chainsaw begins, which in the future is difficult to start or stalls during operation. Air is harder to enter the device and makes the mixture too rich. You can hardly start it, and the reason for this is the formation of dust.

It is necessary to remove the air filter carefully, because if dust is stored on it, it can crumble onto the carburetor. Clean the air filter well with water and detergent. Be sure to dry the filter before installing.

Why gasoline does not flow in the chainsaw?

Carburetor needle. On cheap chainsaws, the needle in the carburetor often sticks, which prevents fuel from flowing. Sometimes it is enough just to move the needle and insert it correctly.

Oil seals. Chinese and even branded chainsaws may have poor-quality oil seals with poor tightness. Fuel stops flowing when the fuel mixture begins to squeeze out through the oil seals. Gasoline leakage is quite possible through oil seals.

Poor quality gasoline

Every experienced chainsaw user knows that fuel should not be left in the tool reservoir for a long time. The fact is that during long-term storage inside the tank, unnecessary processes will occur with the formation of resin and the polymerization of various components. Do not leave fuel in the tank for more than 2 weeks, and even if your tool is started with such fuel, it can lead to the formation of carbon deposits on the parts of the CPG (rings, piston).

Gasoline does not flow into the chainsaw: a solution to the problem

There can be many breakdowns associated with a chainsaw, and it can be quite difficult to solve some. If you have been working with this gasoline tool for a long time, you have had a problem when gasoline does not enter the carburetor or does, but it is very difficult and does not allow the chainsaw to start normally. Fortunately, experts have long found the reasons for such a breakdown and therefore we have compiled the main methods of repair.

First of all, we check for commonplace reasons, for example, the presence of gasoline in the tank. If there is one, we check the process of supplying fuel from the tank through the wire. To do this, it is enough to disconnect the gas line from the carburetor and try to pump fuel. It will be correct to supply fuel through the hose in jerks, this will make sure that there are no problems with the gas tank. If the fuel does not flow even in jerks or drips too slowly, the reasons may be as follows:

The fuel filter is clogged with dirt and dust;

The petrol feed line is dirty.

Surprisingly, even having a full tank can cause no fuel to flow. Therefore, try not to fill the tank to the maximum. An overfilled fuel tank can pressurize the tube that connects to the carburetor.

Breather check

It is the breather that plays a serious role when starting a chainsaw; you can find such a part near the gas tank cap, or rather in the area of ​​the air hole. The breather plays a simple but important role. it prevents fuel from flowing out and sets the correct air pressure. It is thanks to this air that the fuel enters the carburetor, and a malfunction of this element is a common reason when fuel does not enter the chainsaw. Impaired breather operation will form negative pressure, from which gasoline will not be able to flow to the carburetor when trying to start the tool.

It is quite simple to check the performance of the breather, disconnect the gasoline pipe from the carburetor and check how the fuel flows. If the gasoline flows in a small stream, everything is in order, if it does not flow at all. the breather is more likely to be clogged with dirt. If done correctly, you can clean the part, sometimes it is easier to replace it with a new one. The cleaning procedure is carried out either by hand or with a strong jet of compressed air.

Chainsaw does not idle

In this case, you should start looking for a malfunction with the filter elements. For the most part, it is due to the decrease in the throughput of the air and gasoline filters that the idle speed begins to “float”.

If everything is in order with the filters, then it is necessary to check the components of the gas supply system, and also to make sure that there is no spontaneous change in the carburetor settings.

The reasons for the violation of the adjustment of the carburetor of the chainsaw:

• Heavy wear on the engine (pistons). In this case, more care must be taken to repair the engine, however adjusting the carburetor may improve the saw‘s functionality for a period of time.
• Blockage in the carburetor due to damage to the air filter, the use of poor quality gasoline and the formation of scale In such a situation, in addition to adjusting the carburetor, you will also need to flush it.
• Strong vibration of the saw or damage to the protective cover. This happens extremely rarely, but there are still cases.

Signs that indicate the need to adjust the chainsaw carburetor:

• The engine either does not start, or it starts and immediately stalls. This is due to the use of a poor fuel mixture.
• Significant increase in fuel consumption and emissions. An increase in the amount of exhaust gases indicates that the fuel is not completely combusted. The reason for this may be oversaturation with fuel.

The carburetor adjustment scheme for different models of chainsaws is different and is described in the instruction manual. However, the general principle remains the same: it is necessary to change the quantity and quality of the fuel mixture supplied to the engine cylinder.

Basic carburetor setting

Slowly tighten the maximum and minimum speed adjusting screws (H and L) clockwise until the stop, and then one and a half turns in the opposite direction.

The chain dulls quickly

The chain doesn’t stop

If, when working with a chainsaw, you notice that the saw chain does not stop at the right time, then this breakdown may have 2 options.

• The brake band is dirty. When the saw is in operation, dirt, sawdust, dust, etc. can get under the belt. As a result, the brake mechanism is locked and the chain does not stop when the throttle is released. The problem is eliminated by cleaning this unit.
• The brake band is worn out. It is necessary to replace this element of the brake system.

Why does oil flow

Many owners of chainsaws are faced with such a problem as oil leaking from under the unit. Most often, oil leaks due to damage to the oil hose connected to the oil pump. The photo below shows exactly the case when the end of the hose broke and does not fit tightly on the pump nozzle.

But to get to this place, you will need to remove the clutch mechanism from the shaft. In some models of chainsaws, oil may leak out at the junction of the oil pump with the hose of the oil tank (indicated by an arrow in the photo).

To stop the lubricant leak, you will need to pull this hose out of the seating position. To do this, you can use pliers by pulling on the outside of it. At the end of the hose, you will see a rubber plug that is causing the oil to leak. This plug must be wiped well to remove the remaining oil, after which its seat must be sealed with something. You can use car sealant or fum tape as shown in the following photo.

Next, insert the hose into the hole, reinstall the plug and seal it using a flat-blade screwdriver. At this point, the operation to eliminate oil leakage can be considered completed.

Chainsaw engine malfunctions

The engine is the main unit of a chainsaw, and most of the breakdowns that occur in it are associated with a gasoline drive. Correct diagnostics can determine the causes and remedies for malfunctions, even for an unprepared user.

The main problems with starting the engine can be as follows:

• the engine does not start;
• works unstable;
• a start occurs, after which the unit immediately stalls;
• stalls under load.