Technically, the prop blast should act like the pump forcing the water through the pickup. That is what most of the racers that were at Legg Lake said, here in CA.
ORIGINAL: mistycreekboats
I use garden hose with fitting on end to run my boats at home - just turn pressure down ........ no pickup will pickup water without the boat moving without a pump............ period. Add or replace the pro Boat water pump if u want a simple pump...