A lawn mower that won’t start after winter usually has one of three problems: stale fuel clogging the carburetor, a dead battery (on electric-start models), or a spark plug that’s fouled from sitting. In most cases, a carburetor clean or fuel swap gets it running again — and if you’d rather not deal with it yourself, Doc Wally’s will come to you and handle it on the spot.
Key Takeaways
- Stale gasoline is the #1 cause of post-winter no-starts
- Ethanol-blended fuel breaks down in 30 to 60 days, gumming up carburetors
- A fouled spark plug is a quick, inexpensive fix
- Electric-start models need a charged battery to crank
- Doc Wally’s mobile service saves you the hassle of hauling anything to a shop
Why Fuel Goes Bad Over Winter
Gasoline doesn’t keep forever. In fact, regular pump gas starts to degrade in as little as 30 days, and ethanol-blended fuel (which is most of what’s sold in Texas) attracts moisture and breaks down even faster. When you park your mower in October and fire it up in March, the fuel sitting in the carburetor bowl has had months to turn into a sticky varnish that blocks the tiny jets and passages the engine needs to run.
The fix is usually a carburetor clean. Sometimes you can get away with running fresh fuel and a carb cleaner additive through the system. Other times the carb needs to come off and be soaked and cleaned manually. Doc Wally’s handles both approaches and can diagnose which one you actually need.
The Spark Plug Problem
If fuel isn’t the issue, the spark plug often is. Plugs that sit unused can foul with carbon deposits or simply wear out. A fouled plug won’t fire consistently, which causes hard starts, rough idling, or an engine that fires once and dies. Spark plugs are inexpensive and replacing one takes about 10 minutes in the field.
Dead Batteries on Electric-Start Mowers
Riding mowers and zero-turn mowers with electric starters have a small battery that powers the starter motor. That battery will self-discharge over a winter storage period, and some will die completely if they weren’t trickle-charged. If you hear a click or nothing at all when you turn the key, a dead battery is the likely culprit.
What Not to Do
Don’t keep cranking an engine that won’t start. You’ll run the starter motor down, and if there’s a fuel issue, you’ll flood the engine and make it harder to start even once the underlying problem is fixed. One or two attempts, then stop and call Doc Wally’s.
Mobile Repair Saves You the Hassle
The nice thing about calling Doc Wally’s is that you don’t have to load the mower into a truck and haul it somewhere. They come to your property in the New Braunfels area, diagnose the problem in your yard or garage, and fix it on the spot in most cases. If it needs something more involved, they’ll let you know upfront.
Call Doc Wally’s today to schedule a mobile small engine repair visit and get your mower back up and running before the grass gets out of hand.
People Also Asked
Q: Can I use old gas from last season if it still looks clear?
Clear gas can still be degraded — color isn’t a reliable indicator. If the fuel is more than 60 days old, replace it before trying to start the engine.
Q: How do I prevent this from happening next season?
Add a fuel stabilizer to the tank before storing the mower for winter and run the engine for 5 to 10 minutes to circulate it through the system.
Q: Is it worth repairing an older lawn mower, or should I just replace it?
If the engine runs well and the issue is a clogged carb or bad spark plug, repair almost always makes more sense than replacement — those are inexpensive fixes on an otherwise good machine.