Hedge trimmer starts then dies? Causes and quick fixes

Old or incorrect fuel

Most common cause

Fuel older than 30 days can cause poor performance and stalling.

What to do:

• Empty the fuel tank
• Refill with fresh, recommended fuel mix
• Restart the product

Tip: Always empty fuel before long-term storage.

Dirty air filter

A clogged air filter restricts airflow and can cause the engine to stop shortly after starting.

What to do:

• Remove the air filter
• Clean it or replace it if dirty

Fuel flow issues

If fuel cannot reach the engine properly, the trimmer may start and then die.

Check for:

• Blocked fuel filter
• Cracked or clogged fuel lines
• Dirty carburettor

What to do:

• Replace the fuel filter if needed
• Inspect fuel lines for damage
• Clean the carburettor if necessary

Faulty or worn spark plug

The engine may start briefly but fail to keep running if the spark plug is worn.

What to do:

• Remove and inspect the spark plug
• Clean or replace if needed

Blocked spark arrestor

A clogged spark arrestor (in the muffler) can restrict airflow and cause stalling.

What to do:

• Clean the spark arrestor
• Replace if heavily clogged

Incorrect choke use

If the choke remains on after startup, the engine may stall.

What to do:

• Move the choke to the “run” position after the engine starts.

Air leaks or loose components

Air leaks or loose parts can disrupt engine performance.

What to do:

• Check for loose screws or fittings
• Inspect seals and connections