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The suction of the pump lowers the pressure in the line and a t the same time lowers the evaporation point of the fuel. So if you have a restriction or a hot spot in the line the fuel evaporates before it gets to the pump. Even though these pumps are self-priming and are mounted below the waterline, a heavy sea state or aggressive backing can sometimes lock these pumps up if they get too much air. I got tired of having to break the discharge hose loose from the pump to “burp” the air out of the pump head — which blows saltwater everywhere — so I could reprime the pump.

vapor lock. vapor lock - disruption of fuel movement to a gasoline engine caused by excessive vaporization of gasoline. Vapor lock occurs when the fuel pump, which is designed to pump liquid, loses suction as it tries to move fuel vapor. The engine will usually stall, but in less severe cases may accelerate sluggishly or knock due to an excessively 2017-08-01 vapor lock. Centrifugal Pumps. Impeller Design Prevents Vapor Lock. Specialized centrifugal pumps handle liquids with up to 70 percent gases.

Atmospheric Pressure of 14.7 PSI (Sea Level) presses on the liquid in the tank. See Figure 1.

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When fuel boils inside a metal line or If your vapor lock is indeed being caused by the pump the you need a regulator with a bottom port to return to the tank. That way all the fuel that passes thru the pump is new, fresh, cool gas. I used my stock sending unit. We had a true vapor lock problem in a 39 Ford.

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Fix vapor locked gasoline pump 1 January, 2018.
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This disrupts the operation of the fuel pump, causing loss of feed pressure to the carburetor or fuel injection system, resulting in transient loss of power or complete stalling.

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In the past in hot weather I fashioned a temporary wire mesh basket around the pump. When I get vapor lock I simply drop in some Ice cubes from my cooler. The basket holds the ice against the fuel pump and cools it as it melts. Too much variation in gasoline these days.

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Fuels that have high volatility can also cause vapor lock… 2010-09-29 A vapor lock is caused by gasoline turning to vapor and thus not pumping properly. What you're describing, prior to the pump, would be better spoken of as a starvation situation. And I'd offer that it'll be necessary to do some hands-on exploration to find out where the problem is! 2013-03-17 1948-01-01 Vapor lock is a problem caused by liquid fuel changing state to gas while still in the fuel delivery system of gasoline-fueled internal combustion engines.

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I had a need for gasoline in 5°F / -15°C weather. When I pulled up, everyone was complaining that the pumps were unusably slow, just a few hundredths of a gallon per second.

If it doesn't start up then it's probably something else. Vapor lock can affect any kind of engine during normal operation where the outside ambient temperature remains high, or the fuel system becomes overheated because of high engine temperatures or lack of insulation.