(*) This brings me to another question:
Where do I get cheaper Yanmar parts?
I paid $36 for the impeller, that seems
an awful lot of money for a tiny piece
of rubber.
It has 'Johnson' imprinted on it. Are
outboard parts cheaper?

The Johnson pumps are Swedish made pump. I have one on my Yanmar
3GM30 for the seawater pump. I don't know where you got your
impeller, but I got two for that price last week. I think I
ordered out of the Lewis Marine catalog at my local marina,
where I had overnight delivery.

Johnson part # 09-810B-1

Leanne
s/v Fundy
W1WXS