Throws gasoline into the air vent

Causes of malfunction

You can determine that the carburetor is overflowing by several signs:

Condition of the candle. A dirty spark plug indicates a rich fuel mixture, which means high gasoline content. Even a serviceable or new spark plug may not be able to cope with the flow of fuel entering the cylinder and over time it will become covered with soot, will be constantly wet and the engine will stop starting.
Gasoline leaks through the air filter. Signs of fuel may be found in the air filter housing.
Gasoline leaks through the float chamber gasket.

It is worth noting that these signs can appear either on their own or after repairs. For what reasons can the carb overflow?

Failure of the fuel valve

The tanks are equipped with vacuum fuel taps with three outlets. One of them is taking fuel from the tank, the other is supplying fuel to the carburetor. The third outlet is intended for supplying a vacuum hose. When a vacuum is created in the engine, the valve membrane begins to pump fuel.

Advice! If the engine does not start after a long period of inactivity (fuel is not pumped in), in order not to wait for the engine to pump it in, you can remove the vacuum hose on the other side of the tap and create a vacuum with your mouth until the carburetor is filled.

Clogged air filter

If there is insufficient air supply, the scooter may also overflow fuel. You can diagnose the filter for air permeability as follows. Simply disconnect the air filter. If the engine now starts to work correctly, then it is necessary to change the air filter. When the carburetor on a scooter without a filter still floods, “dig deeper”!

Locking needle

Briefly about the principle of operation of the float chamber. Fuel enters it, thereby raising the float. The float, rising, lifts the locking needle behind it. When there is enough fuel in the chamber, the shut-off function closes the fuel supply hole.

If the shut-off needle is worn out (the tip or metal body is worn out), then it cannot completely close the supply hole and gasoline continues to flow. The same effect occurs if a speck (grain of sand) gets under the locking needle.

What to do if oil gets in

If oil flows into the air filter, this most often indicates a malfunction of the internal combustion engine. The deficiencies must be eliminated as quickly as possible before the engine fails. You can determine the reason why the air filter is in oil as follows:

Check compression in all cylinders individually. 9-12 atm is considered normal. In this case, the compression values in different cylinders should be as close as possible - with a difference of no more than 1 atm. If the results obtained are below the minimum, this indicates serious problems with the engine;
assess the color of the exhaust gases. If the exhaust is black or blue, the parts of the cylinder-piston group are worn out.

If the compression is normal and the smoke from the exhaust pipe is normal in color, the problem may not be with the engine. It is possible that oil is filling the air filter due to obstruction of the hoses for removing crankcase gases. In this case, it is enough to clean or replace the pipelines. If nothing has changed, you need to carefully check the internal combustion engine and related systems.

If you find that the engine air filter is oily, but you cannot postpone your trip, you can temporarily fix the problem and carry out a full repair after returning. To do this you need:

remove the crankcase gas supply hose from the filter fitting;
close the fitting;
connect a longer hose to the crankcase ventilation so that the lower section of the tube is located below the level of the power unit.

This solution will allow you to use the car for some time without fear that the engine will suddenly fail. After completing the trip, you cannot postpone troubleshooting - major engine repairs will then be very expensive and take a lot of time.

Trouble-shooting

What to do if you had to face such problems? Let's go in order. You need to start with the air filter - if there are no problems with it, then proceed to the next steps.

Fuel tap problem?

If gasoline constantly flows from the fuel supply hose, even when the vacuum hose is removed, then the valve is faulty. It simply does not work, but is always in the open position. In this case, the tap must be replaced with a new one.

If, when you remove the vacuum hose, gasoline stops flowing, then the reason is a constant vacuum - you need to climb into the cylinder head.

Locking needle

Provided the faucet is in good working order, you can play the shut-off game. How to get to the needle of a scooter or moped?

To remove the carburetor, you need to disconnect the air filter; hoses suitable for it; unscrew it from the intake manifold and remove the throttle cable.
Next, use a Phillips screwdriver to remove the float chamber housing.
Assess the condition of the shut-off needle and float antennae.
If necessary, replace the needle and bend the float antennae. If the needle is in good condition, then its seat should be thoroughly washed and blown out.
Reassemble everything and install it on the engine.

Vacuum accelerator (if all else fails)

In addition to the locking needle, Chinese scooters are also equipped with a vacuum needle (vacuum accelerator). This device also works from a vacuum hose connected to the “carb”. This needle has 5 (usually) adjustment positions. When the scooter accelerates, the vacuum opens this needle and more fuel is supplied to the combustion chamber.

The system is correct, however, everything breaks down. Over time, none of the needle positions produces results. This problem can be solved simply by removing or cutting the vacuum hose (not the one to the fuel tap)! And the engine no longer overflows - miracle of miracles.

Air leak in the intake manifold

If air enters the engine, which is not “seen” by the air mass meter or absolute pressure sensor, a too lean mixture of fuel and air will be formed. This problem is caused by air leaks in the intake tract.

Main reasons:

overheating of the motor (affects the condition of the gaskets);
external intervention;
Damage to gaskets as a result of improper use of carb cleaner.

Very often, difficulties can arise if the seal between the intake manifold and the cylinder head is damaged, since such a leak is not easy to detect visually.

Search for suction in the manifold

On gasoline engines, excess air may end up in the manifold due to depressurization of the air ducts, wear of the rubber seals of the fuel injectors, or damage to the hoses leading to the vacuum brake booster.

In order to find air leaks, different methods are used:

Shutting off the air supply. It is necessary to disconnect the pipe from the filter housing and start the engine. After this, cover the pipe with your hand - if there is no suction, the engine will stall. If the engine continues to run and you hear a hissing sound, there is definitely a leak.
Clamping of hoses. You need to start the engine and after a certain time try to hear a hissing sound. If it was not possible to detect the location of the damage to the seal, you need to pinch the hoses connected to the receiver one by one. If you have pinched and released a hose and this has affected the operation of the power unit, look for a problem in this area.
Compressed air. The intake system of an idle engine must be treated with a soap solution, then shut off the air supply from the filter and pump air through one of the tubes.
Spraying with a flammable mixture. To find where air is leaking into the engine, use products such as gasoline, WD-40, or carburetor cleaner. Using the selected product, it is necessary to spray all joints. When the fluid appears at the leak point, you will notice changes in engine operation (the speed should rise or fall). It is better to use a medical syringe for spraying.

Using this method, check the following places: the pipe between the valve cover and the idle air control, the pipe between the mass air flow sensor and the IAC, the connection between the intake manifold and the throttle valve, the connection between the manifold and the cylinder head, the injector seals, all hoses in the areas where the clamps are attached.

Smoke generator. Not all motorists have such a device, which is why it is usually used in auto repair shops. You can buy a ready-made solution or make it yourself (there are plenty of instructions and videos on the Internet). The bottom line is that it is necessary to ensure that smoke is supplied through any hose into the intake manifold. Smoke will seep out in problem areas.

Gasoline gets into the air filter, which is why gasoline pours and leaks on scooters, mopeds and motorcycles

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Loss of power and starting problems may be accompanied by the presence of gasoline in the air filter. The malfunction may appear either after a long period of parking or during operation of the scooter. Eliminating the breakdown depends on the culprit that caused fuel to enter the filter.

Causes of a malfunction associated with gasoline in the air filter

When using scooters, not all owners think about the quality of the fuel poured into the gas tank. Gas stations skimp on timely replacement of filter elements, so the quality of gasoline will not meet the standards. This is especially noticeable in places remote from megacities.

Debris gradually moves from the gas tank through the fuel system and into the carburetor. If a small grain gets under the shut-off needle, it will not allow it to take its place and will cause an overflow of fuel in the float chamber. After leaving the carburetor it will end up in the filter element.

Design and principle of operation

The main principle of operation of the ventilation system is to supply gases from the crankcase to the intake manifold, where they will again be sucked into the engine cylinders. Ventilation is called forced ventilation because the pressure in the intake manifold is below atmospheric pressure, so gases from the crankcase are sucked into the intake manifold during the intake stroke. Schematic diagram of the system operation.

Exhaust gases leak into the crankcase.
A mixture of gasoline, oil and exhaust vapors enters the oil separator (oil particles settle on the walls and then fall back into the pan).
After passing through the oil separator, the purified gases enter the intake.
A mixture of clean air, purified vapors and gases is cooled in the intercooler, after which it enters the cylinders.

A valve with variable capacity allows for the removal of gases in proportion to their accumulation in the crankcase. As you can see in the figure, the system has a backup channel that bypasses the valve. Since our goal is to figure out how oil gets into the air filter and how to solve this problem, we will not delve into all the intricacies of the system’s operation, as well as its varieties.

Why the carburetor on a scooter floods: finding the causes and eliminating them

Technology has one bad property - it breaks. The scooter is no exception to this rule. A common problem in operating a scooter or moped is the carburetor, a device that prepares the air-fuel mixture. This article draws attention to the following problem: why a scooter’s carburetor floods.

Causes of malfunction

You can determine that the carburetor is overflowing by several signs:

Condition of the candle. A dirty spark plug indicates a rich fuel mixture, which means high gasoline content. Even a serviceable or new spark plug may not be able to cope with the flow of fuel entering the cylinder and over time it will become covered with soot, will be constantly wet and the engine will stop starting.
Gasoline leaks through the air filter. Signs of fuel may be found in the air filter housing.
Gasoline leaks through the float chamber gasket.

It is worth noting that these signs can appear either on their own or after repairs. For what reasons can the carb overflow?

Failure of the fuel valve

Advice! If the engine does not start after a long period of inactivity (fuel is not pumped in), in order not to wait for the engine to pump it in, you can remove the vacuum hose on the other side of the tap and create a vacuum with your mouth until the carburetor is filled.

Clogged air filter

What are the signs of a rich mixture in the engine?

You don't need to be an experienced auto mechanic to recognize the signs of a rich mixture - they are impossible to miss and hard to ignore. If your car's engine runs on a rich mixture, you may notice a number of special signs:

Popping noises and shots can be heard from the muffler, even at idle;
Black or gray smoke coming from the exhaust pipe;
The orange “Check Engine” icon on the dashboard came on;
Computer diagnostics revealed error P0172;
The dynamics fail - the car is “held back by something”, at the same time it “stumbles”;
Fuel consumption has increased significantly;
In the worst case, the car simply refuses to start when cold;

Operating a car with such problems is very difficult, sometimes even impossible. Inexperienced car owners may be frightened by this: images of satisfied mechanics at a service station and sums with zeros are drawn in their heads. The principle of treating a disease at an early stage suits this case perfectly. There is no point in starting this problem. How not to ignore the above symptoms.

Gasoline Gets into the Air Filter, Why Gasoline Leaks and Throws on Scooters, Mopeds and Motorcycles

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Troubleshooting Methods

Most often, if fuel leaks from the filter, owners rush to change the carburetor. The mistakes of this approach to repair are:

gasoline may enter the air filter not only due to the fault of the carburetor, so replacing it with a new one may not eliminate the problem;
ridding the float chamber of debris is not a labor-intensive process and is carried out without resorting to financial costs;
revising the settings of the quality and quantity screws can eliminate the malfunction without dismantling the carburetor.

Therefore, to correct the problem, it is recommended to adhere to the following action plan:

If there has been interference with the idle speed or mixture settings, check that they are set correctly;
Check the operation of the vacuum valve. When closed, fuel should not pass through;
Check the electronic starter enrichment. After turning it off, you need to test run the engine;
Remove the carburetor and disassemble it;
If no significant wear, deformation, or damage is visible, blow it out. If plaque or fallen resins are visually detected, the float chamber will need to be flushed;
Some fuel system designs include a reed valve. It has low maintainability, especially when made of metal. If any bent is found, it is recommended to replace it with a new one.

It is necessary to change the carburetor only if it begins to throw fuel due to excessive wear. In this case, the vehicle has a solid mileage on the odometer and gasoline begins to be thrown into the air filter not unexpectedly, but gradually with increasing volume. Initially, you can only notice the smell, but over time the amount of fuel in the filter can reach 100 - 150 grams.

The most unpleasant situation is when the valve burns out and excessive pressure occurs, pushing fuel into the filter. This situation happens extremely rarely, but you shouldn’t discard it when looking for a breakdown. For diagnosis, it is enough to measure the compression. If its value is low, the engine should be repaired.

Preventing Breakage

The sudden appearance of gasoline in the filter after visiting a gas station indicates dirty fuel. You should stop visiting unverified stations. It is also not recommended to buy fuel while replenishing the storage tank, as the flow from the fuel truck pipe lifts all the debris from the bottom of the tank.

When performing adjustment work, you should mark the positions of the mixture quality and quantity screws. To do this, you need to tighten the bolt completely, counting the revolutions. In case of subsequent unsuccessful setup, knowing the preset value, it will be much easier to return to the original state.

Driving should be as careful as possible. Any drop of the scooter may cause damage to the fuel system. Also, rust that comes off due to dynamic load can fix the locking needle, preventing it from taking the required position.

Whatever the reason for the appearance of gasoline in the filter, you should not delay troubleshooting. Operating the engine in such conditions leads to excessive wear of all parts, which increases the need for major repairs. A quick response to the first symptoms of malfunction of the fuel system will save the owner’s wallet from unnecessary waste.