I recently had fuel problems on my 4107, so I bought 2 "facet" pumps, $80 or so each.
Just remember to make sure they put out 3-4 psi without regulation. They work a treat.
One of them is on the line from my main tank.
The second I put in the middle of a 2m hose with outbourd snap style fittings. I put a mating snap lock fitting on the second intake into my cav, and can either refuel or run the engine
off a 20l outboard