Which way does the float go on the swing arm?  With the arm pointing to the
rear of the car, is the float ball on the driver or passenger side of the
car, (LHD)?
 It will go in the empty tank either way.  But, I think I remember, from
years ago, that it only swings freely if it's on the correct side of the
arm.  I didn't notice which way it was, when I took it apart.
                                                      Mike M.