The fuel tank stopper deos not make a good seal, I went to Hobby People and one fo the guys that work there said that his had the same problem, if you use the sullivan round 12oz you will need to dremmel the former that holds the fuel tank because the stock tank is oval.

I finally got my new tail gear, to install it you will need to remove the stock rudder control horn, the new tail set up has a double horn that fits around the leading edge of the rudder, if you made the hinge gap really tigth yo will need to re-hinge your rudder, also the new control horn is a little wider then the thickness fo the rudder so I cut the old plastic bracket that screws into the rudder and used it as spacer to fill the gap. it took me 10 min to change it out, it looks good