Husqvarna Mower Not Running for These 9 Reasons

If you can get your mower going, but then it dies, it’s likely because the engine isn’t getting enough fuel or air.

The air filter, spark plug, ignition coil, fuel filter, fuel line, fuel pump, carburetor, gas, and age can all contribute to a Husqvarna mower stalling out.

Many of these things are within the skill level of the average homeowner, but occasionally you may encounter something that you just don’t feel comfortable working on without risking injury to yourself or the mower.

Seek help from a Husqvarna dealer or a lawnmower repair shop if this occurs to you.

When troubleshooting, repairing, or using a piece of equipment, be sure to first read and follow all safety instructions found in the manual.If you don’t feel confident in your ability to conduct the repair safely due to a lack of experience, training, or health, it’s best to call in an expert.

Causes of a Husqvarna Lawnmower’s Refusal to Start

Husqvarna Lawnmower Leaks Old Gas

In as little as 30 days, the gas in your lawn mower or storage container will start to degrade and become less effective.

Ethanol-based gasoline is more susceptible to corrosion in the fuel system and deposit buildup, both of which reduce fuel delivery to the engine.

Over time, the water and ethanol will settle to the bottom of the tank, away from the gasoline.

Take out the used gas and replace it with new:

• Take out the used gas and discard it. For this purpose, a fuel siphon pump is ideal.
• Fuel additives can be combined with new gas to remove contaminants and dry up the fuel system.
  • Fresh gas with no more than 10% ethanol should be used. Avoid alcoholic beverages with an ethanol content above this level.
  • Sea Foam Motor Treatment or STA-BIL are two examples of fuel additives you could use.
• Fill the gas tank with the blended fuel. The gasoline mixture needs to be worked through the fuel system, so start the mower and let it run for a bit.

Husqvarna Fuel Components With Fuel Restrictions

As I indicated before, stale gas can lead to problems with the fuel system becoming clogged. A Husqvarna mower won’t keep running if it isn’t getting enough fuel. Blockages can be caused by old gasoline, dirt, and debris.

• Stuck fuel filter
• Fuel line clogging
• Faulty gas pump

Husqvarna Lawnmower with a Filthy Carburetor

A carburetor’s job is to adjust the fuel-to-air ratio before it enters the engine’s cylinder, where it can be burned.

It’s common knowledge that filthy carburetors can’t process fuel properly.

It’s possible for the fuel jet to become clogged or for the carburetor’s fine mechanisms to become stuck. The engine will have trouble running as a result of a lack of fuel.

Follow these simple procedures to figure out if your running issues are the result of a filthy carburetor:

• Make sure the carburetor is receiving fuel. You can accomplish this by checking to see that fuel is being pumped to the carburetor. If it isn’t, then it’s likely due to a clogged gasoline filter, damaged fuel lines, or a broken fuel pump.
• Carefully take out the air filter from the air filter housing so that no debris enters the air intake.
• You can now start your lawnmower after spraying carburetor cleaner into the air intake. If it starts out strong but gradually loses power and eventually shuts off, it’s probably a sign that the carburetor needs cleaning.
• Carburetor cleaning and disassembly can now begin.

Use these Husqvarna carburetor cleaning instructions to get yours in tip-top shape again. If the carburetor keeps malfunctioning, you may need to have it rebuilt or replaced.

Lawnmower with a Husqvarna and a Clogged Air Filter

The engine is supplied with clean air through an air filter to protect it from the dust and debris that is kicked up during mowing. To prevent the air filter from becoming clogged, it should be cleaned or replaced frequently.

If the air filter becomes so clogged with debris that not enough air can get through it, the engine will run poorly or cease to operate altogether.

Damage to the engine’s internal components can result from continuing operation with a dirty air filter.

Keeping the filter clean and changing it when it wears out is a cheap and easy way to keep your mower in tip-top shape.

The air filter should be replaced once a year and cleaned multiple times during the mowing season.

How to clean the PAPER air filter on a Husqvarna lawn mower:

• Take out the filter and throw it away.
• Remove any lingering dirt from the case by wiping it down. Don’t let any grime get into the machine’s air filter.
• Strike the filter against something substantial. You want to knock as much dirt loose and out of the filter as possible.
• Make sure the paper element of your air filter is not damaged or too dusty by holding it up to a light source. You should reuse the air filter if at all possible. If you can’t fix it, then it’s time to replace it.
• Replace the air filter and secure the housing’s lid.

How to clean the FOAM air filter on a Husqvarna lawn mower:

• Take out the filter and throw it away.
• Remove any grime from the filter housing by wiping it down. Keep the air filter clean and make sure no dust gets in there.
• Take a look at your filter. A new filter should be used if you see any dark patches, rips, or brittleness in the old one. If it seems in decent shape, cleaning can begin.
• Use water and a mild detergent to clean your foam filter. Rinse the filter to get rid of the soap residue.
• Drain and dry flat. If you put your filter somewhere sunny, it will dry more quickly.
• Apply foam air filter oil once the filter has dried completely. You want the oil to cover it well, but you don’t want it to drip. If there is too much oil on the filter, you can either wring it off or soak up the excess oil with a paper towel.
• Replace the air filter and secure the housing’s lid.

Misaligned Choke on a Husqvarna Lawnmower

When trying to start a cold engine, the choke is essential. To get the engine going, you need to close the choke and let more gas into the cylinder.

To keep running once the engine has warmed up, the choke must be opened to allow a greater volume of air to enter the combustion chamber.

If the choke isn’t set properly, too little air will be allowed into the engine, causing it to sputter and die.

A Husqvarna Lawnmower with a Grimy Spark Plug

If your Husqvarna mower won’t start, check the spark plug. As carbon, dirt, and oil build up on the plug, it loses its ability to generate a spark. Take out the spark plug and inspect it.

The spark plug has to be replaced if it is very black in color, has shattered porcelain, or has burnt electrodes.

You can keep using it if it’s only somewhat unclean, but you should clean it with a wire brush to get rid of the carbon and grime that has accumulated on it before you do.

Make that the spark plug is properly gapped according to the manufacturer’s instructions. The manual that came with your vehicle should have all the details.

Spark plugs that aren’t properly gapped or aren’t firmly attached can also cause your Husqvarna to stall.

If problems persist after you’ve verified that you’re using a healthy spark plug or have replaced it with a new one, you should move on to inspecting the ignition coil.

Husqvarna Lawnmower Ignition Coil Fault

If your Husqvarna lawn mower keeps cutting out, check the ignition coil. When the lawnmower heats up, the ignition coil’s windings can come apart and cause a short.

This will prevent the spark plug from producing a spark since it will not receive the necessary voltage. Using an ohmmeter, make sure there is no break in continuity.

Cracked Fuel Cap on Husqvarna

Your Husqvarna mower’s gas cap has a vent in it to facilitate airflow. This allows for the fuel tank’s air pressure to be equalized.

Because of the vacuum, fuel cannot escape through the fuel lines. Because of a lack of fuel reaching the engine, the mower will stop off.

Remove the gasoline cap and restart the mower once it has cooled down. If it fires up and runs smoothly, check the fuel cap vent.

To be sure, replace the gasoline tank cap and keep the mower going for a time to see whether it automatically turns off.

If the gasoline cap on your Husqvarna is broken, get a new one.

Engine Overheats on Husqvarna

A Husqvarna lawnmower’s engine will cut out if it gets too hot. A number of factors, including insufficient oil in the engine, using the wrong oil, a clogged mower deck, and a blocked air filter, could be to blame.

Read this manual for more information about what can cause a Husqvarna lawnmower to overheat.