Symptoms
- Air output feels much weaker than before
- Engine runs fine but leaves barely move
- Debris visible in the intake screen
- Battery model shows reduced power near end of charge
Likely causes
- CommonClogged air filterA dirty filter restricts intake air the fan needs to build airflow.
- CommonBlocked intake screenLeaves and debris often get pulled against the intake grille.
- PossibleDebris stuck in the fan housing or tubeSticks or clumped leaves can partially block airflow internally.
- Less commonWorn fan bladesCracked or worn blades move less air even at full speed.
- PossibleLow battery charge (battery models)Airflow often drops noticeably as battery charge gets low.
What to do
- Turn off the blower and disconnect power (battery or spark plug) before inspecting.
- Check and clean the intake screen of leaves and debris.
- Clean or replace the air filter on gas models.
- Look through the outlet tube for any stuck debris and clear it.
- For battery models, charge fully and retest, since airflow drops as charge depletes.
- Inspect visible fan blades for cracks or damage if the housing can be safely opened.
- If airflow is still weak after cleaning, the fan or motor may need professional inspection.
Tools and parts
- Soft brush
- Replacement air filter
Leaf blower air filterSearch: “leaf blower air filter replacement”
When to call a pro
If the fan or motor itself is worn, a small-engine or power tool repair shop can assess replacement options.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.