Originally Posted by Peregrine
I don't even autocross and have experienced this on the way into work in the morning. Same like you said on hard right turns is the only time it happens to me, too.
I've never seen a cutaway of the Focus gastank, but I'm betting their isn't a baffle below the fuel pump to prevent this from happening.
It looks to me like the tank is fairly rectangular shaped. Also, the located the pump on the right hand side and not in the middle. Seems like a recipe for this problem.