Hi Bob and Co,

Q) If a heat soaked engine will not start due to fuel vaporization an appropriate action will be...

A) Operate the prime pump with the mixture in idle cut off to purge the vapor

The explanation in the answers section states that this will circulate cool fuel through the system and cool down the fuel lines. I understand that heat and low ambient pressure cause fuel vaporization but why would you put the mixture to completely lean? Wouldn't fully rich make cool the lines more?

Thanks

G'day jase88

This is a good resource and goes into the right amount of detail. www.lycoming.com/content/tips-start-your-engine

Thanks Stuart,

This has cleared things up for me.

Cheers