cool can
 

Guys im just getting into drag racing this year..my ?? is does a cool can really make a big difference, on a hot day to prevent vapor lock???thanx brett

With most racing engines running electric fuel pumps, the chances of vapor locking is practically non-existent. But if you're using a stock type of mechanical pump, it can occur. But the real purpose of a cool can is make the gasoline denser and that's where the benefit of the cool can lies.