1) I DO NOT Recommend using "Fake a Lake" or contraptions like them, If you introduce water to your engine under pressure you run the risk of damaging the impeller! A quality hose with good city water pressure will overpressurize the impeller at idle and starve it somewhere above 1000rpm!
2) Use a simple 5 gallon bucket. Go to your favorite big hardware store or pool supply store & get 4' of 1 1/2" swimming pool vacum hose, and a barbed reducing fitting to go to 1 1/4" or 1" from 1.5" depending on your boat.
3) Disconnect your water hose at either the trans oil cooler inlet or at the seawater strainer whichever is easier and connect your new pool hose & drop the other end into the bucket. (I have a large notch cut into the bucket side of my hose to prevent it from sucking to the bottom of the bucket)
4) Fill bucket with your garden hose to the top & shut off supply.
5) Start engine & watch bucket, it should draw it down in 20-40 seconds...thats good, shut down engine.
6) Refill bucket & restart when water nears the top, this time leave hose on wide open....
7) Most ski boats will consume water at idle as fast as you can fill with your hose
Most ski boats above 1000rpm will suck more water than any 3/4" garden hose will ever supply!
This method will allow the pump to draw as needed, only rev engine with sufficient water in bucket....Have Fun.
