While this might work once or twice, to get you through a mowing session, you should still consider replacing the plug. In a pinch, you might be able to lightly clean the plug and gently adjust the gap between the electrodes. If you take the plug out and it looks rounded on top or there are some cracks, then it’s probably wise to replace it.Īt the same time, some bad spark plugs will also look black from carbon or degraded excess gasoline. Physically the center of the electrode should have a flat top. This could even cause a lingering smell of raw gasoline while you are mowing.Ī truly bad sparkplug might also show visible signs. If this fails, then you should contact an experienced engine service center to have the system professionally and thoroughly cleaned.If you are paying attention, you can usually notice if a lawnmower’s sparkplug is starting to go bad.Ī pull mower might take an increasingly longer number of pulls, or a riding mower might take longer than usual to start when you turn the key.Ī lawnmower with a bad sparkplug might also start to develop performance issues or consume more fuel than usual. If you can't smell fuel in the combustion cylinder or see or smell fuel on the bottom of the spark plug, the fuel passageways are likely obstructed. If the carburetor is clogged, the use of spray carburetor cleaner and pressurized air may clear the obstruction. ![]() To verify this condition, remove the spark plug(s). In severe cases, professional cleaning of the carburetor and a possible carburetor rebuild are the only cures for this situation. This can cause deposits and blockages in your equipment’s fuel system. As gas ages, hydrocarbons in the fuel mixture evaporate and the remaining fuel becomes tacky or varnish-like. If fuel was stored in the unit for an extended period, areas such as fuel lines and the metering needle may have become gummed up from the old fuel mixture. Remember to properly dispose of the old fuel. The best solution is to drain the gas from your equipment and replace with fresh gas. Note the color of fresh gas (Left) compared to gas that has oxidized (Right) What should I do if my snow blower has bad fuel? See the image below for a comparison between the color of fresh gas (Left) to gas that has oxidized (Right) and should not be used in your equipment. If the gas is dark in color, it has more than likely gone bad. The other method is to drain a sample from your machine’s fuel tank or your gas can into a clear glass container. Oxidized gas has a sour smell and is much stronger smelling than fresh gas. The easiest way to diagnose gas is to smell the fuel in question. And no, we’re not talking about the after-effects of dinner at your favorite Mexican restaurant. If your snow blower is difficult to start, idles roughly, stalls out, or makes a “pinging” sound, you may have a case of “bad gas”. Of course, many factors contribute to how long gas can be stored, including storage location, temperature, condition of the fuel container, and more. Using Sta-Bil Storage Fuel Stabilizer can increase storage time up to 24 months. Whether in a gas can or in your snow blower, gas can go stale and lose its volatility in as little as 30 days. How long can gas be stored before it goes bad? You make your way to the garage.but your snow blower won't start!ĭid you know that bad gas is one of the most frequent causes of small engines not starting? Read on to learn about how to diagnose and treat engines affected with bad gas. ![]() The snow is falling rapidly and will soon cover your drive and walkway. ![]() ![]() Snow Blower Won't Start - Could it be Bad Gas?.Riding Lawn Mower Attachments & Accessories.
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