Quote Originally Posted by moombadaze View Post
One simple reason the bags dont drain thru the empty pump is the drain hole on the side of the boat is higher that the level of water in the bag.
???? As long as the drain pump is lower than the bags/drain line it should drain with no problems. The pump has plenty of power to get the water to the exit hole even though it is higher than the pump itself. You will loose a little efficieny because of the friction loss. My pump is in the lower engine compartment, which is lower than the drain line coming from the bags. One thing that will create problems with these bags draining is having air pockets in them with an aerator pump. This is another reason I am adding a seperate vent line for each bag when filling to eliminate the air build up you get while filling them.