Fuel tank vent tube
 

Got a EFI440 with a return line system and am just wondering if the stock vent tube (about 1/4" ID) is too small. Am in the process of chasing a fuel issue and am thinking my fuel is getting hot. The tank seems to be evaporating a lot of gas. I'm in Texas so heat is definitely an issue. Thanks again.

The diameter of the vent tube is likely not the problem. Location and number of vent ports on the tank as well as what you have or have not attached to the vent port is where your issues likely are.
Obviously I think a II MUCH vent product, properly installed will help.