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Message: [QUOTE="Charles, post: 281649, member: 103"] The "air" entrained into fuel in a system where the pump inlet is kept fully submersed in the fluid is actually the fluid itself in gaseous state. If/when the temperature is high enough, and the pressure low enough, the fuel actually vaporizes and turns into a gas. We see the bubbles and call it "air". This most often happens before the pump where pressure is sub-ambient, and vaporization is most likely to occur for any given fuel temperature. This is also why a clogged pre-pump filter will cause reduced pump outflow, it's causing excessive pressure drop, resulting in substantial vaporization of the fuel coming into the pump. If it reaches a high enough level, the pump may not be able to maintain prime with such a high percentage of vapor, and we call it vapor locked. [/QUOTE]

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