The Bewley Family wrote:
I have a Mercury hp outboard engine (1986) that will not pump water.
I installed (correctly) a new water pump and it still will not pump
water. Any ideas? Thanks! Bill
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Had a similar problem with my newly purchased 95 Yamaha OB. Guy I
bought it from said the impeller had been recently replaced, but on my
first time out water stopped coming out the pee hole. I thought the guy
had been lying and bought a replacement WP kit but when I took the thing
apart I found tool marks, and a perfectly good impeller.

I put a hose on the tube up into the engine and water wouldn't go
through it. Eventually I pulled off a hose from the cylinder head to
the pee hole outlet and water squirted out of it. Seems like the
channel in the gear housing was plugged up. (About a 6" channel from
the power head to the pee hole.) I managed to work a wire in from both
ends and cleared whatever was plugging it up.

Hope you're as lucky.