![]() Locate the motors fuel pressure regulator. Refilling the boat’s fuel tank with lower RVP fuel will decrease the chance of vapor locking. 11 to 15 RVP (cool to cold weather) fuel will change from liquid to a vapor at lower fuel temperature than 8 to 10 RVP (warm to hot weather) fuel will. Fuel pumps are designed to pump liquid, not air, and the increased pressure inside the fuel lines keeps the fuel pump from being able to keep the fuel moving. Find out what the RVP of the fuel in the boat’s fuel tank is. Vapor lock occurs in motors that are unable to cool the fuel by other means. What is Vapor Lock Vapor lock happens when the temperature of fuel gets high enough to transform liquid into a vapor state. Check the water stream fitting on top of your motor to ensure your motors water pump is operating. Since I bought a used Rans its look like the guy that install the engine does not installed a fuel return line to the tank. Vapor lock is the result of the evaporation of aromatics in the fuel line. It will release the heat and fix the vapor lock. Do not worry let it stay idle for a few minutes. Vapor lock (fuel foaming) is caused by overheating engines, insufficient fuel supply, fuel pump failures, 90 bends in fittings, cracked fuel lines. ![]() You may fall into trouble in case the engine does not function suddenly. Allow 10 to 15 minutes for the chainsaw to cool, and the vapor pressure will subside. So I was sure I have Fuel Vapor Lock.Īfter checking and checking, I decide to replace all hoses and install all again by the Rotax instrucction, I found out that my engine does not have a fuel return line to the fuel tank and thats why the vapors can not get out of the fuel system. Fixing vapor lock in a chainsaw is possible. Then I installed a Aux fuel pump and when I experience the same problem I turn on the aux and the problem goes away. When I leave the airplane under the hot sun for around 2 or 3 hours and then go to fly I has engine missfire as if the engine was not getting fuel. Vapor lock is when the fuel is hot enough to boil and turn into a vapor, so doubt a snow blower is experiencing that. I use to have similar problem in my Rans S12 XL. I had low fuel pressure about 1.7 PSI so I turned on my aux fuel pump and the fuel pressure went to 2.2 and cleared it up immediately. ![]()
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