Water pumping at idle but not at higher speeds

[Long Island Boater JH]

Not pumps water fine at idle and lower speed but doesn’t pump out of telle tale at higher speeds. Motor is not getting hot. It’s a 93 mercury 50 hp.

 

[racerone]

Install a new impeller.

 

[Long Island Boater JH]

I changed the impeller at end of year last year and have only used it twice since doing that. Do you think it could be something else?

 

[airshot]

Is there simething that might be partially plugging the pee hose?? Had a similiar issue with a recently purchased 40hp Merc 2stroke. Motor wasnt getting hot but no water in pee hose, impellor just replaced last fall. Ran a wire up the hose but didnt feel any blocks. I took a chance and ran it at wot for just a minute...if it didnt pee I was going to shut it down. Just about at top speed it blew something out the hose and peed like a race horse after that. Must have had a bug or seed stuck in the hose.

 

[Long Island Boater JH]

It pumps out good at idle and lower speeds it just doesn’t come out of the pee hole when at higher speeds. Wondering it had a blockage somewhere else?