The transmission has nothing to do with the fuel sender. At least that's granted.

To find advise you should describe your problem in more details.
Does the rear wheel block completely?
Does the rear brake disengage?
etc...

BTW: Welcome to TM!

Hannes
once: Green M3W; 2013
now: Red 4/4 Sport; 2011
and some practical cars for use in real life