300xs constant alarm at idle - goes off with a little throttle

[millsryno]

Took the boat out today. A constant alarm was going off as I was putting around at idle speed. If I gave the boat a little throttle, the alarm went off. Motor is a 2007 300XS.

Tonight I replaced the water impeller in case that was the issue. The old impeller looked good, though. I was getting 3PSI at idle with a good stream coming out of the pee hole. At cruising speed, 3200 - 3500 RPM, I was getting about 10 PSI.

I will lake test the boat Saturday to see if the new impeller fixed it. If not, what would you look at next?

[Savage]

You need to have the faults checked, anything else is pulling straws.

[EuropeanAM]

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