Petrol that gets too hot the fuel line will cause vapour lock?

Yes, it is possible for petrol (gasoline) to get too hot in the fuel line and cause vapor lock. Vapor lock occurs when the fuel in the line vaporizes due to excessive heat, creating a vapor bubble that disrupts the flow of fuel to the engine. This can lead to engine stalling or difficulty in starting the engine.

Vapor lock is more likely to occur in older vehicles with carbureted engines, as carburetors are more susceptible to heat-induced vaporization. However, modern fuel-injected engines are also not immune to vapor lock, especially in extreme heat conditions or when the fuel system is not properly insulated or shielded from heat sources.

To prevent vapor lock, it is important to ensure proper insulation and shielding of the fuel lines, especially in areas where they are exposed to excessive heat. Additionally, maintaining proper engine cooling and avoiding prolonged idling in hot conditions can help prevent the fuel from getting too hot and reduce the risk of vapor lock.