sonnytex you being a child and modeler of the fifties as I perhaps you remember the pen bladder tanks all the rage for performance enthusiasts in some controlline and freeflight, Actual fountain pen bladders with a tube inserted and the assembly rubber banded. Penny ballons were also used. Force filled with a fuel bulb and pinched off untill the engine was started on prime then the hemostats were released.

Usually did not work very well due to the high head pressure at the needle. That is untill quite a cottage industry in speed needles developed where small mom and pop suppliers started producing needles for various engines with much finer threads than the stock types thus minimising the sensitive needle syndrome from the high pressure a little more user friendly.


John