Wash / Livewell pump - unwanted water flow

[Dave Hirshberg]

abl11,
Heres what's wrong. Your hull scoop only has holes or slits on
one end. Thats causing a lot of pressure at high speeds. To relieve this pressure there needs to be a way for some of the water to escape out of the backside of the scoop. You can either elongate the slits in the scoop towards the back or you can drill several 1/4 inch holes in the back cup of the scoop. Don't worry you'll still get pleanty of water and your pump wont cavitate or run dry. These types of scoops are routinely used on generator intakes and other systems that can't take the additional pressure. Personally I'd drill three or four holes in it and see how that works.
Dave.