Snowblower Won't Start — Diagnosing the Problem Before Snow Season
A snowblower that won't start in October — after sitting with old fuel all summer — is one of the most common calls we get in early fall. The problem is almost always in the fuel system: old ethanol-blend gasoline left in the carburetor has varnished the jets, and the snowblower won't run on fresh gas until the carburetor is properly cleaned. The right time to prevent this is before you store it in spring, but the right time to fix it is as early in fall as possible, before our queue fills up.
Common Symptoms
- Engine cranks but won't fire after sitting all summer
- Starts briefly then stalls
- Runs on choke but dies when choke is opened
- Engine surges at idle — revs up and down
- Hard to pull start or electric start won't engage
Likely Causes
- Varnished carburetor from old fuel — most common cause
- Old or degraded fuel in the tank
- Clogged fuel line from fuel that sat and thickened
- Stuck carburetor float from ethanol varnish
- Spark plug fouled or worn from storage
- Recoil starter issue (separate from the engine itself)
What We Inspect
- Fuel system — tank, petcock, and carburetor
- Carburetor condition: float, jets, and needle
- Spark plug condition and gap
- Compression — is the engine mechanically sound?
- Choke operation — plate fully closes and opens
- Oil level (some engines won't start when oil is low — safety shutoff)
Professional Diagnosis
The best time to service a snowblower is before snowfall, not after. We have capacity in August through October. Waiting until November means you'll be in queue when you need the machine.
Related service: Snowblower Repair