Being volatile, fuel gets vaporized even by small amounts of heat. Leaving the gas tank cap off: When you leave your gas tank cap off, it allows heat to enter the tank.Other causes of vapor lock in lawn mowers include: That’s why gas-powered lawn mowers are more susceptible to vapor lock than other mowers. It’s worth noting that gasoline is highly volatile, so it vaporizes easily due to its low boiling point components. The extra vapor inside the mower prevents the remaining gasoline from making it to the engine, making it difficult for the lawn mower to start.
When the gas inside a lawn mower gets too hot, it evaporates and becomes vapor.
#SMALL ENGINE VAPOR LOCK HOW TO#
If you want to know what causes lawn mowers to get vapor lock, how to diagnose it, and how to start an engine after the lock, keep reading! What Causes Vapor Lock in a Lawn Mower? The evaporated particles inside the tank keep the gas from getting to the engine, making it lock up. Vapor lock occurs when the gas inside a lawn mower starts to evaporate because of the heat. But one problem you might not have heard of is vapor lock.ĭuring warmer months when the temperatures are high, it’s not uncommon for lawn mowers to get vapor lock. You might end up with a mower that won’t start or one that’s cutting unevenly. When it comes to lawn mowers, there are a lot of things that can go wrong. If you make a purchase through links from this website, we may get a small share of the sale from Amazon and other similar affiliate programs. To protect the front bearing, it was designed to run out of fuel before oil ! You must turn around and BACK up steep hills to keep the tank higher than carb and oil to the front bearing.As an Amazon Associate we earn from qualifying purchases made on our website. No oil pump with splash feed allows the front bearing to dry out first on steep uphill grades. On long steep hills, the tank becomes lower than the carb intentionally to run it out of fuel.
#SMALL ENGINE VAPOR LOCK DRIVER#
Some Model T's do that too Henry Ford designed my 1921 Center Door Model T with the fuel tank under driver seat. I put the old glass bowl style on when there's enough room. I'd bet on the original filter getting slightly clogged causing the problem and the new one having more resistance causing the same problem when fuel is low. When it dies, if you blow into the tank to pressurize it, and it fills the filter, that is a sign you're overcoming the resistance of the filter the same as more weight of more fuel pushes it through. When all else fails, process of elimination. I'd put a short piece of tubing in place of the filter too, with very little fuel in it to see if it eliminates the problem. Then a nice drill bit would be running up through the outlet nipple and clearing that obstruction. Does fuel pour out of the nipple on the tank bottom? If not then pull the tank and investigate what's plugging it. If not, then I would remove the fuel line from the tank. At that point, I would blow backwards through the fuel line and see if fuel begins to flow again. I suspect the flow stops (or slows way down) before the tank empties. Start by disconnecting the fuel line upstream of the filter and try to let the tank drain into a gas can. Your clear fuel filter is helpful in this diagnosis. The open float valve in the carb is allowing the fuel to drain from the line and air to refill the fuel filter from below. Something is preventing fuel from leaving the tank and making it to the filter. Your problem is upstream of the fuel filter towards the tank. Gravity feed to the carb where the float lets fuel in to keep the bowl full. Fuel tank also under hood right near engine. I too have a 19.5 HP engine in my craftsman mower.
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