You are limited to a diaphragm pump to lift water and self-prime. Unfortunately they are expensive.
Member BS Pro-Staff and Billbob Pro-Staff
Proud Member of Team Geezer... authorized by: billbob and "G"
What about an electric fuel pump?
http://www.autozone.com/autozone/acc...uestid=1150837
You mentioned that you only needed to pump a few gallons at a time. One pump, a tee, and a couple ball valves to select which hull to pump from. Not sure if fresh water would be corrosive to the pump. Probably only about $60 or $70 with the pump and valves. Maybe you all ready have some around.
I went to the local junk yard and bought an external electric fuel pump for ten bucks. I pump out my fuel tank for storage.
Mike