Snow Blower Won't Start: Check These Six Things First
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The short answer
Most snow blowers that won't start after sitting since last winter have stale fuel gumming the carburetor. Check in this order: fuel valve open and key in, choke on and primer pushed 3–5 times, fresh fuel, spark plug, then the carburetor bowl. If the engine runs but the auger won't turn or throw, look for a broken shear pin.
TruFuel 4-Cycle Ethanol-Free Fuel
Fresh fuel that won't gum the carb.
Fix it in this order
- 1Basics: safety key fully in, fuel shutoff open, run switch on.
- 2Cold start: full choke, push the primer bulb 3–5 times (more in deep cold), then pull or press the electric start.
- 3Fuel: if it's been in the tank since last season, drain it and refill with fresh fuel mixed with stabilizer, or canned ethanol-free fuel.
- 4Spark plug: pull it, check for fouling or a cracked insulator, replace if in doubt.
- 5Carburetor bowl: loosen the bowl drain screw; varnish or water means stale fuel is the culprit. A carb cleaner soak or replacement carb fixes it.
- 6Oil: thick summer oil makes cold starts hard — use the winter weight your manual specifies.
Runs but won't throw snow
| Symptom | Likely cause |
|---|---|
| Auger doesn't turn | Broken shear pin or slipped/broken auger belt |
| Weak throw | Clogged chute or worn paddles (single-stage) |
| Won't move forward | Drive belt or friction disc wear |
Frequently Asked Questions
- Why does my snow blower start then die?
- Usually a partially clogged carburetor jet from stale fuel, or the choke opened too early.
- How many times should I prime a snow blower?
- Typically 3–5 pushes; check your manual. Over-priming floods the engine.
- Should I use ethanol-free fuel?
- It's the safest choice for equipment that sits for months. Otherwise add stabilizer to every can.
The Gear We’d Buy
Everything referenced in this guide, in one place.
TruFuel 4-Cycle Ethanol-Free Fuel
Top pickFresh fuel that won't gum the carb.
Typically $20 - $35
Snow Blower Shear Pins
Fixes an auger that won't turn.
Typically $10 - $20
Snow Blower Carburetor
When cleaning doesn't fix stale-fuel varnish.
Typically $15 - $40
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Key Takeaways
- Stale fuel causes most no-starts.
- Choke, prime, fresh fuel, plug — in that order.
- Runs but no throw usually means a shear pin.
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Reviewed by
The Lawn Tool Hub Test Bench
We buy, borrow and break lawn tools on our own yards — clay in the back, sand-cut Bermuda in the front — and write down what actually changed the result.
Keep reading
Get Your Snow Blower Ready Before the First Storm
Pre-season snow blower checklist: oil, fresh fuel, spark plug, belts, shear pins, skid shoes, tire pressure and a test run — done before the first snow.
Which Snow Blower Fits a Small Driveway?
Single-stage or two-stage, cordless or gas: how to match a snow blower to a one- or two-car driveway, typical snowfall and paver or gravel surfaces.
Your Winter Lawn Care Checklist, Month by Month
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Top pick
TruFuel 4-Cycle Ethanol-Free Fuel