Replacing the Anti Siphon Valve, Fuel Lines and Fuel Water Separator in my water ski boat. 

Why was my boat down on power?
I was not getting enough fuel to my Carburetor due to a clogged fuel filter. I cleaned it out and the boat is running much better.
How do you replace an Anti Siphon Valve?
I replaced the entire fuel delivery system from the Fuel Pickup hose, the Anti Siphon Valve, the Fuel fill hose, The Fuel Vent Hose to The fuel Line. I also cleaned out the Fuel Water separator mount and put a new filter on.
My fuel lines were from 1987 and it was time for an over haul. I replaced everything with the most up to date materials including the 3/8" A1-15 LOW PERMEATION Fuel Hose
Big thanks to Ron Tanis at @ for the advice and products.