Quote:
Originally Posted by CajunSpike
You could bypass the intake water line by removing it from the thruhull or disconnecting it from the water pump input. Then connect up a bypass hose and somehow extend the hose so you could drop it in a bucket or toss the end overboard to pickup water.
This would test if the thruhull is partially blocked and/or if the intake tube is good. Good flow by getting water another way, is a clue.
You could also bypass the exhaust output line and toss that bypass hose overboard or in the cockpit. If you still get good flow at higher rpm with the exhaust bypass, then the exhaust hose is not the issue.
Process of elimination.
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This is what I call divided and conquer. Work on one section of the system at a time, be sure it is working correctly then move on to the next section. For me it is helpful to start at one end (the water inlet or the water outlet end) and work to the other end. It results in less scattered thinking. This having been said others have other valid approaches to trouble shooting.
TRUE GRIT