Johnson 5hp not pumping water
So we have a fairly ancient (probably 70/80's vintage) 5hp Johnson outboard on our aluminium SeaNymph to use as a local runabout.
Jumped in it today and started up, and wasn't getting any cooling telltale. As I've done before when this has happened, I pulled the boat out and flushed it through with a hose, to ensure the passageways were clear, and got a lovely strong jet coming out.
But as soon as I start the engine (on the hose), the telltale stops...
Is the impeller knackered?