There are a limited no of options to seal fuel pump connections, and none of them are completely maintenance free. Those with banjo bolts and copper washers , when disturbed, need new washers, or the old ones annealed, to prevent leaks. Fibre washers dont have long lives in my experience. O ring seals for low pressure pumps would seem to be the cheapest solution, but require a little care in fitting. I have a box full of assorted Orings, so I hope something in there will work when one is needed on the Huco.
Saw an ad in an auto shop today for an electric pump for carbs, and it listed pressure as 14 psi......I suspect that would cause problems with many carbs.