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FIX VAPOR LOCK MANUAL
Also, follow your owner’s manual for how much you should be priming the engine when starting. Don’t use it on a warm engine, and limit the pulls on a recoil when the choke is engaged. Limit the use of the choke in your lawn mower engine for only when it’s necessary. While this method does work, it is a bit more laborious than simply removing the spark plug. Eventually, it’ll reach that perfect point where it can fire. Each successive pull of the recoil will gradually bring the air/fuel mix into the right proportion. With the choke off, the engine will introduce more air into the combustion chamber. The other option is to simply turn the choke to the “off” position. This is the fastest way to fix a vapor locked lawn mower. Since there is no compression, the extra air/fuel mix can escape through the plug hole. With the spark plug removed, either pull the recoil or activate the starter motor. The simplest method is to remove the spark plug. So now that we know what a vapor locked lawn mower is and what causes it, how do we go about fixing it? Fortunately, it’s a simple process.
FIX VAPOR LOCK HOW TO
Tools Needed (Commissions Earned) How to Fix a Vapor Locked Lawn Mower It’s quite easy to damage a starter if the engine is vapor locked. This is because the piston is working harder and harder to compress a higher proportion of air/fuel mix than it was designed for.įor an electric start, you can hear the engine “chugging” and working harder to start. Eventually, the recoil might not even rewind. If you have a manual pull start engine, each successive pull of the recoil will become more difficult. Luckily, it’s readily apparent to tell if you have a vapor locked lawn mower. How to Tell if you Have a Vapor Locked Lawn Mower When you go to start it, if you re-choke the engine, it could possibly flood because the choking is not required. So, you shut the engine off and move the chair. After a few minutes, it’s warmed up and you have to stop to move a chair in your yard. Let’s say you start your lawn mower and go about cutting. When the engine is warm, it does not need to be choked. Normally, choking the engine only assists with starting the engine when it’s cold. If it does not start, clear the vapor lock (and figure out why it didn’t start!)Ĭhoking the engine can also be problematic if you use it on a warm engine. Eventually, you will end up with a vapor locked lawn mower.Ī good rule of thumb is to only pull the recoil with the choke in the on position 3-5 times. Since the fuel amount is remaining the same, the resultant proportion will be “richer.” Every time you pull the recoil, the richness of the mixture is increasing. This reduces the amount of air coming into the engine.
When the engine is “choked,” the air passage is narrowed down. The intent is to ease ignition, but too much fuel will cause the vapor locked condition.Īlso, if you attempt to start the engine with too many pulls with the choke in the on position, this can cause a vapor locked lawn mower. Each successive pulse of the primer bulb introduces fuel into the combustion chamber. Perhaps you primed the bulb a few too many times. This is dependent upon the type of engine, but as we just mentioned, the root cause is too much fuel. The only way to solve this problem is to clear the vapor lock, or “unflood” the engine. Oftentimes, the situation exacerbates itself because each pull of the recoil introduces more fuel into the chamber that’s not being fired. Because the compression is inadequate, the engine will not fire. This prevents the cylinder from compressing, or creating the compression that’s required. In the case of a vapor locked lawn mower, there is too much vapor in the combustion chamber.
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