For Vapor lock we have terms and definitions in 2 topics. The topics are Automotive and Ethanol.

Vapor Lock (Automotive)

Condition caused by bubbles in fuel due to overheating. Can cause stalling, hard starting, or failure to start.

Vapor Lock (Ethanol)

An engine performance problem due to high vapor pressure in fuel. While ethanol increases the vapor pressure of fuel, state and federal standards continue to lower vapor pressure levels—virtually eliminating vapor lock problems. Additionally, all major auto manufacturers now use in-tank fuel pumps, which are not subject to the vapor lock problems seen in older in-line fuel pumps.

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