Fuel/Air Separator

[ebb]

Guess this is technical. For any boat with a built in tank and vent tube.
Surging gas or diesel while filling can explode back out the fill and/or up the vent causing embarassment and a fine. Here are some tests done by

http://www.boatus.com/foundation/fin.../solutions.htm

that seem objective. I was convinced the
Racor Lifeguard Marine Fuel/Air Separator LG100,
which got the best marks for keeping all the fuel in the tank whatever size it is and is installed in the vent line is the way to go. Found lowest price at go2marine for $54.32. That's still pricey, but it's 4" D and almost 10" long!! The much smaller gas only unit goes for $30 more. The diesel/gas LG100 got the no fail no spill prize in above test. Check it out.

Where to rig it is the problem.