Except for cold starting, driveability will approcah fuel injected systems when set up in this fashion. ![]() It occurs when the liquid fuel changes state from liquid to gas. This assures a constant supply of clean, cool fuel to the carburetor. Vapor lock is a problem that mostly affects gasoline-fueled internal combustion engines. If you look at the fuel bowl vent you will see vapor and gas percolating out of the vent tube when you are having this trouble. There is nothing wrong with your cars the fuel has a very low boiling point. ![]() This is the proper way to set up your fuel system. Vapor lock is being caused by the bad fuel that is currently being sold everywhere. Although this doesnt solve all vapor lock issues, this resolves most of the vapor lock issues caused by excessive heat under the hood as well as the 10. You can see the regulator is used as the restrictor for the fuel return. Your plumbing should essentially like this: This will prevent the crankcase from filling with fuel should the mechanical pump diaphragm rupture. I like to get a 3/8" sending unit and replace all the line all the way to the carburetor with 3/8", but that's another arguement. Install the pump as close to the tank as possible. Since this is how I run a fuel system anyway, I would eliminate vapor lock to begin with. There are some things that can be done to reduce the affects of vapor lock before contacting a professional service. Parts of an outboard motors fuel system are cooled or vented to prevent or break up the bubbles in fuel lines. The resulting excess gas bubbles accumulate to the point of actually blocking normal fuel delivery. Vapor lock is the bane of summer for boaters. If the problem goes away after that, you know what it is.Īssuming you diagnose it as vapor lock (which is really rare, btw), here's what I'd do to fix it. Vapor lock generally occurs when the fuel (usually gasoline) within the fuel delivery system overheats and vaporizes too rapidly. This will allow the excess heat to go into the clothespins instead of the fuel. The gasoline vapors accumulated in the fuel lines exert backpressure. Along every exposed section of steel line under the hood you can get to, clamp as many wooden clothespins on as you can get. Chainsaw vapor lock: A chainsaw that is vapor-locked has trouble starting just after a run. This tendency is higher in hotter climate and in higher altitude.First, so that you won't be chasing your tail, diagnose the problem. In automotive fuel specifications the temperature, at which a ratio of 20 (vapor) to 1 (liquid) is reached (commonly referred to as T(V/L) = 20), indicates the risk of the fuel to form a vapor lock. Vapor-liquid ratio is the temperature at which gasoline forms a ratio of vapor. Therefore a critical vapor liquid ratio, which can cause vapor lock, will be reached at lower temperatures with Gasoline-Ethanol blends than with regular Gasoline. In the US, vapor lock is controlled by the vapor-liquid ratio rather than VLI. ![]() I think a fuel/pump cooling issue (or lack thereof) might be the explanation for Red Bull's sudden failures.īut even more concerning is that high altitudes magnify this effect.Īdding 10% of Ethanol to Gasoline – as is currently done in the USA - drastically reduces the V/L ratio temperature. ![]() The fuel temperature needed for a 20:1 Vapor:Liquid ration lowered from ~59 degrees to ~57 degrees with the change to E10. There were concerns mentioned before the race about the temperature of the fuel at low fuel levels (towards the end of the race) which may have proven accurate.
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