I have been mulling over several different questions regarding fuel system
plumbing in the last year or so - even up to the last resort of an extra
one
gallon (or so) tank with a mechanical pump piped to the intake manifold
after the carb.


Was a modification that was made to some aircraft in the hostile hills of
PNG at one time and known as the missionary fuel system.

A pump or shutoff valve to supply fuel equal to about 80% power into a jet
in the inlet manifold below the carby, so that if the carby jet blocked
there was a fuel option that might get one home..... Would require the carby
butterfly to be opened up to match and if the jet was partly blocked, the
fuel to the carby would be shut off manually to prevent flooding the motor.

A small reserve tank may also be a good idea to go with it.

Considering same as a backup to my aircraft when I build in a couple of
years. Not much weight penalty and the nice warm fuzzy feeling of an
emergency fuel backup system......

Hope this helps,
Peter