<If the fuel tanks are full on takeoff -- this should be no problem....  >

   Yea, but  what about the go around when that C-150 pulls out right in front
of you on short final after a long flight. Light weight, low fuel, steep climb
angle, lots of P factor, tired pilot.

   < It seems to me that the fuel will slosh in the same direction as the
ball,
usually to the right.>

 

"Yea but.. yea but".... sounds like a student pilot. ;)

 

The fuel would slosh IF it were not for the anti slosh flapper valve in the inboard wing designed just for that reason. You did install it in your wing, didn't you? Remember, you will be tested for systems knowledge on your private pilot checkride by the nasty know it all examiner. LOL ;) "Question, "what keeps fuel from sloshing away from the fuel pickup point when a Cessna 150 pulls out right in front of you on short final? Answer the anti slosh flapper valve."