Even a small breeze through your cowl and over the engine can help cool it and reduce the chance of vapor lock. While this might not eliminate the risk of vapor lock, it can greatly reduce it.Īlso, if it's possible, point your airplane into the wind. Once you shut down, open the cowling or oil vents. The best way to avoid or minimize vapor lock is before it happens. But in some rare cases, vapor lock can occur in flight. Generally, if you experience vapor lock, it's when you try to start your plane after a quick turn (shut down and restart within ~30 minutes). Vapor lock generally occurs when the fuel (usually gasoline) within the fuel delivery system overheats and vaporizes too rapidly. Without air moving through the cowling, fuel in the lines can start to vaporize. As you shut down, the heat rises up toward the fuel lines. Vapor lock typically starts when you shut down an engine. My fuel line is close and Im having an intermittent fuel. When Is Vapor Lock Most Likely To Happen? How close can a copper fuel line get to an exhaust header without creating a vapor-lock situation. Put simply, if the volatility of fuel is too low, it might not start, and if the volatility is too high, it can cause vapor lock. The irony of this situation is that higher volatility fuel makes starting in normal conditions easier. Volatility is the measure of how likely a substance is to evaporate at a specific temperature. Automotive gasoline has a range of 8 to 14 PSI). While 100LL is less volatile than the gasoline that you put in your car, it can still easily vaporize when subjected to high heat (Avgas has a Reid vapor pressure range of 5.5 to 7 PSI. The greater the volatility of fuel, the higher the probability of vapor lock happening. The fuel that you burn in your engine also can affect your chances of getting stuck with air inside your fuel lines. Next time it happens try opening throttle fully while cranking, this leans out over-rich mixture and it should start. Fuel can flood the intake through the main jet. So if you're doing a quick turn or just shutting down to refuel, it's important to be aware that you might be at risk of vapor lock when trying to start back up. Vapor lock implies jssue with fuel line, whats happening on these short stops is engine heat is 'soaking' the carb and fuel is 'boiling' in the float bowl.
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