The situation when the benzokos suddenly stops starting or dies after a few seconds of work, is familiar to many owners of garden equipment. Most often, the root of the problem lies in the violation of the supply of combustible mixture, and the first suspect becomes the first suspect. carburetor. However, before disassembling a complex device, it is worth making sure that the fuel physically reaches the combustion chamber. The absence of gasoline in the system is not just an inconvenience, it is a signal to block or depressurize the circuit.
Owners often begin to look for complex engine breakdowns, forgetting about the simplest things: fuel quality, the condition of the hoses or elementary clog. If gasoline does not enter the trimmer carburetorThe engine will not be able to form the necessary mixture for ignition, no matter how much you pull the starter. In this article, we will analyze in detail all nodes of the fuel line so that you can conduct a diagnosis yourself without overpaying for service services.
Understanding the principle of the power system will help to avoid errors during repair. The fuel moves from tank to engine under the influence of the vacuum created by the piston, and any obstacles along the way are critical. Tightness Cleanliness are two of the main requirements for the stable operation of your tool.
Primary diagnostics and inspection of the fuel tank
The first step should always be a visual assessment of the fuel tank and its contents. It’s trivial, but the fact is that the tank may simply not have fuel, or the level sensor (if any) may lie. However, the more important issue is the quality of the mixture. Old gasoline, which has stood in the tank for more than two weeks, loses its octane properties and turns into a viscous substance that can clog thin channels.
Pay attention to the color and smell of the liquid. If gasoline smells like varnish or has a muddy sediment, its use is strictly prohibited. Such a mixture not only will not enter the carburetor in the required volume, but will also disable membranes And rubber seals. Fresh fuel should be transparent and have a characteristic pungent smell.
⚠️ Warning: Never leave a full-tank trimmer for long-term storage. Gasoline evaporates and the oil fraction settles, creating a sticky film that blocks the access of air and fuel.
Check the vent in the tank cover as well. When the engine is operating inside the tank, a vacuum is created, and if air does not enter through the valve in the lid, the fuel will cease to go through the tube. That's a common reason why Gasoline stops coming after 5-10 minutes of operationWhen a heavy load is formed in the tank.
Analysis of the condition of fuel hoses and filter
The path of gasoline from the tank to the carburetor runs through the stove and filter mesh. Over time, rubber hoses can dry, crack or clamped, which completely block the fluid current. Visually inspect the entire visible section of the highway for damage and mechanical damage. Even a microscopic crack can suck air, disrupting the vacuum.
The fuel filter located at the end of the hose inside the tank serves as a barrier to large debris. If it is contaminated, the flow resistance becomes too high, and the carburetor simply cannot "suck out" the right amount of gasoline. Dirty filter is one of the most common reasons why petrol doesn't come in sufficient volume.
To replace or clean the filter, the hose must be removed from the tank. Often the filter sticks to the walls or bottom, and it has to be taken out with a hook. Check the condition of the hose itself: it must remain elastic. The fossilized hose must be replaced, as it will not be able to ensure the tightness of the connection with the carburetor.
When removing the fuel hose from the tank, use a thin wire with a hook on the end so as not to pour fuel and not to get your hands dirty.
- 🔍 Visual examination: Check the hose for cracks, scuffs and cracks along the entire length.
- 💧 Filter check: The mesh element must be clean, without oily plaque and dirt.
- 🌡️ Elasticity: The rubber of the hose should not be rigid or sticky to the touch.
Checking the tightness of the carburetor and air sucker
If the fuel line is intact and the filter is clean, the problem may lie in violation of the tightness of the carburetor itself or its attachment. Suction of foreign air is an insidious enemy that impoverishes the mixture and interferes with the normal absorption of fuel. The carburetor works like a pump, and any abnormal slit knocks its rhythm.
Pay special attention to the gasket between the carburetor and the engine cylinder. If it burns out or deforms, the engine will suck air past the fuel channels. Also check the crankshaft obilk: when it wears, air can enter through the crankcase, disrupting the operation of the entire system. For diagnosis, often use the method of spraying the joints with a carburetor cleaner on a working engine - if the revolutions change, then the tightness is broken.
| Element of verification | Symptom of malfunction | Elimination method |
|---|---|---|
| Carburettor gasket | The engine does not hold idle, deaf | Replacement of the gasket with a new one |
| Salnik knevalval | Oily stains, unstable work | Replacement of the oil (requires disassembly) |
| Fastening screws | Vibration, backlash of the knot. | Screw lift or screw replacement |
| Landing place | Aluminium cracks | Replacement of carburetor or repair of the body |
Vacuum This is the basis of the process of mixing in two-stroke trimmer engines.
How to check the tightness without a special device?
You can use a soap solution. Apply it to the joints of the carburetor and try to blow out the fuel connections. The appearance of bubbles will indicate the place of air sucking. However, this method is less accurate than using a vacuum meter.
Diagnostics of fuel pump and membranes
In modern trimmers, carburetors are equipped with a built-in membrane-type fuel pump. It is this unit that is responsible for supplying gasoline from the tank to the float chamber. If the membrane has lost elasticity, broke or simply "stuck" from time to time, the pump ceases to perform its function, and petrol doesn't come in To the jelly-claws.
The membrane works in tandem with the pulse chamber, receiving signals from pressure fluctuations in the engine crankcase. When this unit is damaged, synchronization is disrupted, and the fuel is either not supplied at all or is supplied by jerks. Often, owners sin on the quality of gasoline, not suspecting that the rubber part inside the carburetor has already served its life.
To check, it is necessary to remove the lower cover of the carburetor (fuel). Pay attention to the condition of the membrane: it should be soft, elastic and without tears. If to the touch it resembles plastic or has visible defects, the remix is mandatory. Also check the cornea, which is driven by a membrane - it should swing freely.
⚠️ Warning: When disassembling a carburetor, be extremely careful with small details. Springs and pearls tend to fly into the grass, where it is almost impossible to find them. Work on a bright, clean desk.
Clogging of jelly and carburetor channels
Even if the gasoline reached the carburetor, it may not get into the cylinder due to the banal blockage of the jelly. Microscopic holes through which fuel is sprayed are clogged with resins from old gasoline or fine dust. This is the most common technical reason why trimmer doesn't start Or it works only on the suction.
To eliminate the malfunction, the carburetor must be washed. Using acetone or aggressive solvents can damage rubber and plastic elements, so it is best to use specialty solvents. carburettor in a spray can. Purging with compressed air is also effective, but only after pre-softening the deposits.
☑️ Cleaning the carburettor
Pay special attention to the needle valve. If there is a mote left on its tip or in the saddle of the valve, the fuel will either be constantly overflowing or not flowing at all. The purity of this pair of parts is critical to maintaining the correct fuel level in the chamber.
Fuel supply adjustment and final recommendations
After cleaning and replacing faulty elements, adjustment of the carburetor is often required. The propellers L (low revs), H (high revs) and T (idle) allow you to adjust the optimal ratio of air and gasoline. Incorrect adjustment can create the illusion of no fuel, although it is physically supplied, but in the wrong proportion.
If after all the manipulations the problem persists, it is worth thinking about replacing the carburetor in the assembly. Modern Chinese counterparts are inexpensive and often more reliable than the restored originals. However, if you decide to leave the home node, make sure that all pads are replaced with new ones.
Comprehensive cleaning of the fuel system and replacement of the filter in 90% of cases solve the problem of lack of gasoline supply without the need to replace the carb-regulator.
Regular maintenance, use of quality fuel with the right ratio of oil and gasoline, as well as the drain of the mixture for winter storage will prolong the life of your trimmer and eliminate the search for reasons why No gasoline is in the carburetor..
Can I blow the carburetor without being removed from the engine?
Theoretically, you can try spraying a cleaner into the inlet, but the effectiveness of such a procedure is low. The dirt will remain inside the canals. Full washing is possible only with a complete dismantling of the node.
Frequently Asked Questions (FAQ)
Why does the trimmer start only with a closed valve?
This is a classic sign that gasoline does not enter the carburetor in sufficient quantities or the main fuel jet laden. When the valve is closed, a strong discharge is created, which allows you to "pull" the fuel through the blockage. You need to clean the carburetor and check the fuel filter.
How often should I change the fuel filter in the trimmer?
It is recommended to check the condition of the filter every season. If you use the equipment professionally or gasoline is not of the highest quality, it is better to make a replacement every 50 hours or at the first sign of power loss.
Can the gasoline not come due to a malfunctioning candle?
No, the spark plug is responsible for the spark, not the fuel supply. However, if the candle is wet with gasoline, it confirms that the fuel in the cylinder is coming, but not flashing. If the candle is dry, the problem is in the fuel system.
What if after cleaning the carburetor trimmer still does not pull?
Perhaps during the assembly, the adjustment of the screws of the quality of the mixture was violated, or the membrane was damaged. It is also worth checking the compression in the cylinder and the condition of the muffler - sometimes it is clogged with soot, preventing exhaust gases from leaving, which blocks the receipt of a new portion of the mixture.