@exam.revolution: Vapour lock happens when fuel vaporises inside the fuel lines, interrupting the normal flow of liquid fuel to the engine. This can cause rough running, power loss, or difficulty restarting, especially when the engine and fuel system are hot. Understanding what causes the vapour to form makes the concept much easier to remember. Comment VAPOR LOCK and we will send you a free guide explaining it in more detail.

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Monday 17 August 2026 21:33:28 GMT