First step: find out where it's leaking. If you're sure the water is clean flush water, disconnect the intake hose from the thru-hull ('twould prob'ly be a good idea to close the seacock first)...put it in a bucket of water--doesn't have to be a full bucket--to which you've added some food coloring. You'll see color on the pump or hose connection where the leak is, and that will tell us whether a rebuild will fix it or not.
© 2016 Peggie Hall
Specializing in marine sanitation since '87.
Author"The NEW Get Rid of Boat Odors"