Hey Bax. I recently bought a FS 120 surpass II pump. What is the difference between this and the III. I can't seem to find the manual on line. Any special points of interest I should pay attention to on this engine? Thanks.

The two engines are quite different. The FS-120 Surpass II has a pump that's driven by the engine's crankshaft, the Surpass III uses an impulse pump, driven by crankcase impulses. They both use a diaphragm regulator, but the designs are quite different, as are the mounting schemes. As far as operating and power is concerned, they are about the same.

If you send an email to the address below, instructions for the FS-120 Surpass II can be emailed back to you.