Husqvarna
Runs great but sometimes after lower the throttle to get off and then getting back on and raising the throttle it stalls, blows smoke and won't crank immediately. Reaks of gas. Is it flooding and if so, why and how can it be fixed?
Experienced gardeners share their insights in answering this question :
Rebuild the carb and change the oil a couple times
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Most commonly a result of improper starting, “flooding” results from various causes, including over-priming, closed choke, stuck valve, gummed carburetor, or immediately trying to restart an automatic choke engine. The easiest way to tell if your engine is flooded with gas is to remove the spark plug.
To solve problems causing a lawn mower to flood and not start, drain stale fuel, add fresh gasoline and fuel stabilizer, clean or replace the carburetor and fuel lines, clean the air filer, check the spark plug, and try starting the engine. If the problem persists, seek assistance from a professional mechanic.
Give it a rest.
Often your nose can make the diagnosis: Flooded engines reek of unburned fuel. Park the mower on level ground, and wait about 15 minutes for the gas to evaporate. Then try starting it again, with the choke off.
To fix a flooded engine, you basically want to get the air to fuel ratio back to its usual balance. You can first try to simply let the excess fuel evaporate. Open your hood and wait a couple minutes before you try to start your car again. And when you do start it back up, make sure you aren`t pushing on the gas pedal.
You can start by installing a continuous pumpdown cycle on the unit. This will remove the majority of the refrigerant from the low-pressure side of the unit. If possible, the compressor could be installed in a controlled ambient area. A crankcase heater also can be installed.
Signs of a flooded lawn mower include a strong gasoline smell, difficulty starting, and white smoke coming from the exhaust. Additionally, the spark plug may be wet or smell like gasoline. If you notice any of these signs, you should stop the engine, wait a few minutes and then try starting it again.
If the car doesn`t start after 15 seconds, stop and wait a couple of minutes, to let the starter motor cool down, and crank again. If you just continue cranking past 15 seconds until the engine starts or the battery dies, you may overheat or damage the starter.
A full gas tank and oil reservoir are the essential first steps when checking why the lawn mower won`t stay running, but the problem could also be a dirty filter, clogged carburetor, improper fuel mixture, or a dirty spark plug.
Lawn mowers can get wet as long as it doesn`t get soaked with water, a little bit of rain won`t cause any problem.
Flooding is often due to over use of the choke. Once fuel has accumulated in the crankcase it may take some time and effort to clear it. *2-stroke, cold starting procedure: Apply choke > crank engine until you hear a `pop` from the exhaust > fully open the choke > continue cranking until engine starts.
Both conditions are typically caused by a stuck or worn float needle valve. The float needle valve is responsible for regulating the flow of fuel into the float bowl. When the tip of the valve becomes worn or debris prevents the closing of the valve, fuel flows continuously into the bowl thus flooding the engine.
Another top reason for leaks from the carb fuel overflow is a stuck carburetor float. The carb float works to regulate the flow of fuel into the carb bowl through a simple mechanism. But if it gets stuck in an open position, fuel will keep pouring into the bowl to the point it overflows through the fuel overflow.
If an engine becomes severely flooded, it may result in fouled spark plugs. A fouled spark plug is when the ends of the spark plug get wet due to an excess amount of fuel in the system. When a spark plug is wet, the electrical energy that tries to fire during starting grounds out instead of firing.
Check for bent or damaged belt idler brackets, a missing, broken, or worn idler tension spring, and service as needed. If these do not resolve the situation, the problem may be with internal components of the transmission.
The most common reason for a surging lawn mower engine is a blockage in the fuel supply, but there are other possibilities: Bad gas. Bad spark plug. Dirty/faulty carburetor.
Check for bent or damaged belt idler brackets, a missing, broken, or worn idler tension spring, and service as needed. If these do not resolve the situation, the problem may be with internal components of the transmission.
The most common reason for a surging lawn mower engine is a blockage in the fuel supply, but there are other possibilities: Bad gas. Bad spark plug. Dirty/faulty carburetor.
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