The brushcutter carburetor does not pump fuel. Some reasons

Gasoline pump doesn’t work on the trimmer

It’s summertime, lawnmowers on private plots usually start. Good tool, powerful and mobile. With the gasoline grass trimmer you can cut the grass and get rid of dried weeds. But there are cases that the lawnmower does not start, runs intermittently or does not develop a workable version of power. No more work here! And as they say, you don’t just yank the starter grip as you mow.

Starting is not a problem just with older brushcutters but also with new ones. How to be in this case? There is only one way out. to listen to the advice of professionals and use their practical experience!

Why doesn’t the lawnmower start. troubleshooting

Caring for the homestead plot, dacha owners periodically face the fact that the lawn mower does not start. There are many reasons for tool failure. In order to correctly diagnose the problem, the owner of a useful machine in the countryside needs to know the device and the principle of operation of its individual parts.

Since the gasoline grass trimmer is a complex device, it is necessary to carefully study the operating instructions before starting to work. Very often they simply ignore it, or get acquainted with it superficially. As a result, when the tool stalls or refuses to start, the question arises. “Why does not the lawn mower start??”Long seasonal interruption of work, improper storage and untimely maintenance of the grass trimmer, will cause a lot of trouble for the dacha owner, to eliminate the causes.

How do you start to diagnose your brushcutter?

If your brushcutter won’t start or cuts out straight away after starting, you need to check all the main components one after the other. The check algorithm is as follows:

  • Fuel tank (fuel quality);
  • The spark plug and the spark plug passage;
  • Air filter;
  • Fuel filter;
  • The breather plug;
  • Exhaust port.

These components are often the source of major problems that can be corrected after a thorough inspection.

Check the fuel mixture

Before starting the engine of a gasoline grasshopper, check the presence and quality of the fuel mixture. Don’t be thrifty, greedy or “smart” about it. Repair or replace the piston group will cost you too much (sometimes up to 70% of the cost of a new tool). The oil-fuel mixture should be prepared according to the instructions. Calculate the number of pistons you need. Excess gasoline left over after work loses its qualities over time.

Carry out diagnostics of the spark plug and spark plug duct

If the quality of the fuel mixture is not in doubt, and the lawnmower stops on startup, it could be due to a primed plug. A usual spark plug wrench (every motorist is sure to have one) and a spare spark plug will do for repair.

  • We unscrew and wipe the spark plug;
  • Dry it thoroughly (don’t burn it);
  • We drain the excess fuel in the chamber through the spark plug hole and dry it;
  • The old candle is cleaned from soot with a file or a lady’s file;
  • Set the gap with a distance of 1 mm (you can check it with any coin);
  • Put everything back and try to start the weed trimmer.

Dry the channel for at least 30-40 minutes. Otherwise there is a risk to re-fill and a new spark plug.

If the grass trimmer engine still does not start, you should rule out such a cause as a lack of spark due to poor contact between the spark plugs and the high-voltage wire. If the connection is good, but there is still no spark, you probably have a “broken” ignition unit. This is where you can’t do without a handyman, t. к. the part is not repairable, but is sold as a complete unit.

Lawnmower Filter Diagnosis

Another reason why the gasoline grass trimmer stalls may be the air filter. To rule it out, try to remove the filter and start the grass trimmer without it. If it works, then you’ll have to change the air filter for a new one, or at least blow out and thoroughly clean the old one.

Gasoline grass trimmer can not start due to contamination of the fuel filter. This is the next step of our algorithm. Here we check the condition of the filter element and, if necessary, replace it with a new one. When replacing try not to leave the suction pipe completely without filter, it is forbidden by any instruction manual. Haste may end up in the repair of the engine piston group.

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Breather and exhaust duct

Often, “delicate” brand-name models don’t start and stop because of the soiled breather valve. The main function of this element is to equalize pressure in the gas tank. When this unit is clogged, vacuum is created in the tank, preventing fuel supply. The problem can be corrected by cleaning the breather plug. You can use an ordinary needle for cleaning.

Normal operation of a combustion engine can be disturbed by dirt in the exhaust duct or muffler grid clogging. The problem is encountered on older generation models. The problem can be solved by traditional cleaning and removal of the anti-sparking grid.

complex causes of mower failure

If the step-by-step algorithm of troubleshooting did not yield results, and your grasshopper still does not start or stalls, it is worth inspecting the carburetor and the engine itself. A clogged carburetor may be one reason the tool does not work properly. Three main problems can be identified here:

  • Clogging of channels or jets. Clean it all with special washes or blow out with a powerful jet of compressed air from a compressor. Do not use needles and wire, as the passages can be damaged;
  • Wear of carburetor gasket. The way out is to replace the failed gasket;
  • Tightness problem. To check this indicator, you can use an ordinary household tonometer, replacing it with a suitable pressure gauge. Watch the readings: if they do not change. everything is fine, and if the pressure starts to drop, it means that some part of the carburetor is defective. You will have to find it and replace it with a new one.

If everything is okay with the carburetor, the gasoline grass trimmer may not start due to wear and tear of the piston group. If you find chips, scratches or scrapes on the piston or cylinder, they should be replaced. Piston rings must be checked. A slight play of the piston when rocking the connecting rod indicates that it’s time to change the rings. This procedure is best left to a professional service center.

complex causes of lawn mower failure

If the step-by-step troubleshooting algorithm did not produce a result, and your grasshopper still does not start or stops, it is worth checking the carburetor and the engine itself. A clogged carburetor can be one of the causes of erratic tool operation. Three main problems can be distinguished here:

  • Clogged jets or passages. All is cleaned with special washes or blown with a powerful compressed air stream from a compressor. Do not use needles and wire, as the passage sections can be damaged;
  • The carburetor gasket is worn. The way out is to replace the failed gasket;
  • The seal is broken. To check this indicator, you can use an ordinary household tonometer, replacing it with a suitable pressure gauge. Watch the readings: if they do not change, all is fine, but if pressure begins to drop, it means that some part of the carburetor is defective. You will have to find it and replace it with a new one.

If everything is okay with the carburetor, the gasoline grass trimmer may not start due to wear of the piston group. If you find chips, scratches or scrapes, on the piston or cylinder, they should be replaced. Piston rings are subject to obligatory check. A slight play of the piston when rocking the crank pin is an indication that it is time to change the rings. It is best to have service technicians do this.

How the lawnmower carburetor works

The throttle valve determines the amount of air to feed, and this directly affects the power of the engine.

Fuel is sucked into carburetor system by pump (its diaphragm). Then it goes through the nozzle in the carburetor. The fluid travels through inlet and outlet valves of the pump. Is filtered by the grid. The needle valve moves into the diaphragm chamber.

  • Air supply to the tube with an air baffle (damper). Baffle plate controls the intensity of the air flow.
  • The fuel system is necessarily narrowed by a diffuser to increase the flow rate.
  • Gasoline through the float chamber and restrictor tube. The float chamber regulates the temporary volume of gasoline. In the float chamber, the pressure level is neutral, but in the tube with a constriction, the pressure level is already low. Because of the pressure drop, fuel flows through the nozzle.
  • Acceleration of the air flow promotes the transfer of fuel (gasoline) and its atomization. The result is an air-fuel mixture of the desired proportion or density.
  • The air/fuel mixture enters the engine cylinder through the fuel tube.
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The area of the open air damper affects the level of air density in the system. The wider the choke is open, the greater the fuel flow and power.

Simply put, adjusting the carburetor on a chainsaw is about creating an optimal fuel mixture by correcting the air flow.

How the lawnmower carburetor works

The throttle valve determines the amount of air to be fed, and this directly affects engine power.

The pump (its diaphragm) sucks fuel into the carburettor system. Then passes through the fitting in the carburetor. The fluid then flows through the inlet and outlet valves of the pump. Is filtered by the wire mesh. Goes to the diaphragm chamber through the needle valve.

  • Air tube with air baffle (flap). A baffle plate controls the intensity of the air flow.
  • The fuel system is necessarily narrowed by a diffuser to increase the rate of flow.
  • Gasoline flows through the float chamber and nozzle tube with a constriction. The float chamber regulates the temporary volume of petrol. In the float chamber the pressure level is neutral, and in the tube with constriction already low. Fuel flows through the nozzle through the pressure differential.
  • The acceleration of the air flow promotes the fuel (gasoline) transfer and atomization. The result is an air-fuel mixture of the desired proportions or density.
  • The air-fuel mixture enters the engine cylinder through the fuel tube.

The area of the open air damper affects the level of air density in the system. The wider the flap is open, the greater the fuel flow and power.

Simply put, the adjustment of the carburetor on the gasoline mower is to create an optimal fuel mixture by correcting the air supply.

How the lawnmower carburetor works

The throttle valve determines the amount of air to be fed, and the engine output depends directly on this.

Fuel is sucked into the carburetor system by the pump (its diaphragm). Then flows through the nozzle in the carburetor. The fluid then flows through the pump inlet and outlet valves. It is filtered by the mesh. The needle valve moves into the diaphragm chamber.

  • Air supply in the tube with an air baffle (damper). The baffle plate controls the intensity of the air flow.
  • The fuel system is necessarily narrowed by a diffuser to increase the flow rate.
  • Gasoline through the float chamber and the nozzle tube with a constriction. The float chamber regulates the temporary volume of gasoline. The float chamber is pressure neutral, but the restrictor tube is pressure neutral. Thanks to the differential pressure, the fuel penetrates through the nozzle.
  • Accelerated airflow promotes fuel (gasoline) transfer and atomization. As a result, an air-fuel mixture of the required proportion or density is formed.
  • The air-fuel mixture enters the engine cylinder through the fuel tube.
brushcutter, carburetor, does, pump, fuel, some

The area of the open air damper determines the level of air density in the system. The wider the open flap, the greater the fuel consumption and power.

Simply put, adjusting the carburetor on a gasoline trimmer is about creating an optimal fuel mixture by correcting the air supply.

Repair of the grass trimmer carburetor with their own hands

In detail: repair of the grass trimmer carburetor with their own hands from the real master for the site olenord.com.

Very often the complaints of gasoline trimmer owners are related to various kinds of carburetor malfunctions. Of course, it is best in such a case to seek help from specialists in this field, for which the repair of carburetors gasoline trimmers is an integral part of the profession. However, if you are still familiar with the basic principles of the carburetor trimmer for grass, you can try to figure out the problem yourself, so as not to overpay money in the service, as sometimes the breakdown can really not be serious.

This article is just intended to help you cope with the problem.

The following will disassemble the most common breakdowns and the causes of their occurrence.

The first thing to do is to inspect the carburetor in general and find out if there is any fuel leakage.

If it turns out that there are no fuel problems, you need to remove the carburetor from the engine and check the condition of the gasket located next to the carburetor.

brushcutter, carburetor, does, pump, fuel, some

If here, too, no faults are observed, you can try to check the carburetor for leaks.

To do this, you can buy a special device that is part of the toolkits for repairing the carburetor of brushcutter and represents a special pressure gauge, which, in fact, and checks the tightness.

If you do not want to spend money to buy it, you can use an ordinary medical tonometer, which just need to change the manometer.

As you use this device, pay attention to the following indications.

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If the pressure does not drop and remains the same for a long time, you can rest easy, because this indicates that the carburetor is tight.

If the pressure after a certain time begins to decline, then there is still a problem.

They can be associated with damage to any parts of the carburetor.

Before you run to the nearest repair shop or a specialized store for the sale of trimmers and spare parts, try to understand the problem yourself. Sorry for the platitudes, but a brushcutter carburetor is not a spaceship of an extraterrestrial civilization, and its repair is quite possible to make with your own hands. To be sure of your actions, read the step-by-step instructions provided in this article.

brushcutter, carburetor, does, pump, fuel, some

Visual inspection of the carburetor will help to identify leaking fuel and air leakage, but the main causes of failure of the device lie inside. Therefore, to determine and most importantly fix the failure, the carburetor needs to be disassembled.

You don’t need a lot of effort to disassemble the brushcutter carburetor.

It is enough to unscrew the four screws on one side

and two of the other one. You can do it with a normal Phillips screwdriver. Carefully loosen the screws and put them aside. You may need them for reassembly. Before disassembling it, it is advisable to cover the table with a white cloth so that you can see all the smallest parts that might fall out.

Disassembly begins at the side of the fuel system.

We remove the primer. swap bubble, which is noteworthy, when assembling the carburetor parts are simply impossible to install incorrectly. The products have characteristic castings and holes.

Now remove the diaphragm. This is what performs the function of pumping fuel into the carburetor.

When you vibrate, the other side of the diaphragm exerts pressure on the rocker mechanism and the needle rises, which in turn opens the hole and the fuel flows.

We remove the carburetor cover with the injection mechanism.

Next, another diaphragm is installed. Remove it carefully.

Under the diaphragm there is another gasket. It also carefully remove, in any case without damaging.

Then we proceed to removing parts from the back of the carburetor. As previously stated, unscrew the two bolts. This is the air system.

Here is the gate valve, which when you add “gas” opens and increases the flow of air into the engine.

After removing it, in your hands there is a bare housing. The carburetor is disassembled.

Fault detection and troubleshooting

Now it is worth paying attention to the problems that occur during the operation of the carburetor and ways to fix them.

The first thing that happens is that the holes and nozzles in the fuel system are clogged with dirt. The filters installed in the tank and directly in the carburetor don’t help. They do miss small particles, which are the reason for the mower‘s failure.

To do this, unscrew the bolt on the mechanism, holding it with your finger. The thing is, there is a spring and a careless action will cause it to lose.

How to blow out the air filter. The most effective way is to use an ultrasonic bath.

It is filled with either a special liquid or gasoline, the carburetor is placed there and under the action of ultrasound, the so-called cavitation effect, the channels are cleaned of impurities.

What are the malfunctions and how to recognize them??

One of the problems of a grass trimmer engine failure can be a strainer. Only two breakdowns can be attributed to this element:

To identify the exact cause, you need to do a number of the following steps:

  • Unscrew the fuel air lock cover to remove the strainer. If there is dirt on the part, you should wash it in fuel or blow it thoroughly. If you see serious damage to the body of the mesh filter, without hesitation you need to install a new one.
  • If the fuel supply pipe of the compressor is broken, then you should check this part. It most often requires periodic replacement due to its low durability.
  • To clean the starting part of the carburetor from clogs use acetone or gasoline. You can also blow components of the device with compressed air. this is the easiest and most convenient way of repair.

Important! The base of the throttle, intake and exhaust valves, the connection points of all parts of the carburetor can be checked by a simple action. lubricate the problem area with soap foam.

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