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. Now, the general strategy behind fixing vapor lock is to reduce overheating. I checked and fuel delivery plentiful, pours out of line from tank, and if I pour water on that little 2 foot long stretch of line, she takes right off. Chlorine demand has nothing to do with cyanuric acid. anyone have any luck fixing vaporlock on 400 My 400 likes to vapor lock right in the very last part of metal line headed for the fuel pump. In fact, chlorine that is locked up by cyanuric acid still shows up as free chlorine in a pool water test. 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). Chlorine Lock vs Chlorine Demand (And How to Identify Them) When you have a chlorine lock issue, the chlorine is still technically in your water it’s just in a very weakened state. 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. When Is Vapor Lock Most Likely To Happen? 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). There are several potential solutions to prevent fuel lines from overheating and solve vapor lock issues in a carbureted or, when necessary, in a fuel injected engine. 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. If you need a quick fix, try: Popping the hood to vent the engine. Ignition coil problems can masquerade as vapor lock, but they go on all year round. The fuel that you burn in your engine also can affect your chances of getting stuck with air inside your fuel lines. Simlpe fix would be to find where the fuel line is too close to heat source and shield it. Vapor lock tends to happen more often in warm weather. 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.
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