I prefer ones that come with a thin straw so you can concentrate the spray exactly where you want it. Clean the CarburetorĬleaning out a carburetor can seem like a pretty daunting task but it’s actually not too bad.įirst, get yourself a can of carburetor cleaner. I’ll go ahead and describe the steps you’ll need to take, starting with the most common fixes, and ending with the least common ones. Now that we’ve talked about diagnosing the problem when a lawn mower starts with starting fluid then dies, let’s move on to how to fix these issues. How to Fix a Mower that Starts with Starting Fluid But Then Dies You could also take a look at your mower’s exhaust if you have a two-cycle mower and see if there is any unburned fuel dripping out of there after the engine turns over. White or bluish smoke are telltale signs that the engine is burning oil. One good way to tell if this is the problem is to watch out for white smoke when starting your mower. In a four-cycle engine, this would mean keeping too much oil in the reservoir, and in a two-cycle engine this would mean that the gas and oil mix is too rich (has too much oil in it). You might not think that putting too much oil in a lawn mower could cause any problems, but it could actually cause your mower’s engine to bog down and die. Now, if your carburetor is clean, you’ve got fresh fuel, and the air filter and spark plug check out, take a peek at your dipstick. If the starting fluid does its job and turns the engine over but the engine dies, it could be caused by a weak spark. Knowing when to replace a spark plug is part of good mower maintenance and in this case could even be what gets the engine running again. Spark plugs can go bad for a few reasons but are luckily pretty easy to inspect and replace. If the carburetor and fuel aren’t the issue, maybe the problem isn’t with the fuel supply but actually an issue with igniting the fuel. If you haven’t run your lawn mower for an especially long time, the fuel and carburetor should be the first things you check. For example, non-oxygenated gas will last the longest, and premium gas will last longer than regular gas.Īdding fuel stabilizer can also help prevent your gas from going bad, but it won’t make it last forever. It’s hard to say exactly how long you can let gas go before it “goes bad” because it really depends on the type of gas you use. You can imagine that if a little gas sits for a couple of years and jams up your carburetor, the same could happen in the gas tank. This problem is pretty easy to identify – take a look at your air filter and see what condition it’s in. Most commonly, they get clogged by oil that has leaked out when tilting a lawn mower incorrectly, or just over time after filtering out all the dust and debris in the air. Sort of like carburetor troubles, a clogged air filter won’t let your engine get as much air as it needs to run.Īir filters can get clogged up for a bunch of reasons. Leftover fuel that sits in the carburetor bowl creates a varnish-like buildup that gums everything up. This is especially likely if your mower has sat for a couple of years without running. Usually, this happens because the carburetor is dirty. Starter fluid might be enough to get the engine going initially, but if the carburetor isn’t delivering the right mix of fuel and air, the engine won’t be able to stay alive. Nobody likes to hear that the carburetor might be the issue, but in this case, it is a very common one. Let’s talk about the possible causes a bit more before getting into the fixes. If you’ve managed to get the engine turned over with the help of some starter fluid, you might not need to go much further to have it running smoothly. Most of the reasons why a small engine starts with starting fluid then dies are related to the fuel supply. Possible Causes of a Mower That Dies After Using Starter Fluid It can get a little bit confusing when trying to figure out what problem you might be having, so I’ll talk about these issues in more detail below. The main reasons for why your lawn mower starts with starter fluid then dies are: issues with the carburetor, a clogged air filter, bad or old gas, spark plugs that aren’t firing correctly, and an improper oil level. 3.5 Adjust the Oil Level Why Does My Mower Start With Starter Fluid Then Die? (The Short Answer)
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