I have a downloaded manual for the pump used on the SF61. If you want me to send it to you, PM me. It may be of value or not. I think I downloaded it from the OS website, so it may be available there too. A friend of mine has the same engine that until this spring was still new. He bought it around 1991. It runs great. I got the manual to find out how to connect the fittings of the pump to the tank, etc.

George