Cool Can. Use one or not?

A full flow system is having a regulator with a return.The fuel is constantly flowing and doesn't get as hot as standing fuel waiting to get used. But this can be put in with a cool can also and would even work better. The fuel entering the can is not as hot to start with and doesn't sit waiting to enter the carb.. The regulator should be mounted as close to the carb or injection as possible and the cool can as close to to the relulator. Use the can no matter what system you use.