There's no draw from the carby to suck fuel into the float bowl - only from the float bowl through the jet via the venturi effect, so yer lookin at some kinda fuel pump... which I'm not entirely sure anyone has done bfore w/these engines. Maybe? Probably? *shrug* I've not seen one anyway...
Still, if I hadta do it I'd consider something like a vacuum powered diaphragm pump, common on many small engines.
You'd need to tap off the crankcase or intake manifold for a vacuum fitting, but that'd be a heck of a lot easier than tryin' to keep power going to an electric pump... and while I'm sure they're out there - I've not seen a 'letric one that lil.
Here's some more vacuum fuel pumps... but I dunno the rep of the company: http://www.scootsusa.com/fuel-valve-...les-p-109.html