Actually I subscribe to the vented cap all by itself. I use 93E10 auto fuel exclusively and don?t want a lot of air exchange in the tank. Alcohol is very hydroscopic and will absorb moisture in the air. Also, octane rating for auto fuel will diminish if not stored in a sealed container.
So I run a cap with the small vent hole and have had zero problems in 258 hours. When I did the fuel tank SB I elected to not install the new vent system. Fuel pressure and fuel flow are rock steady regardless of fuel quantity.