Baught a used OS FS120 surpass engine. Not sure how to plum it from the fuel tank to the engine. Can someone send me a diagram so I can follow. Thanks

It should just plumb like any other engine. Are you using a 2 or 3 line system?

using a 3 line system. This engine has a pump

One fill line to the tank, one fuel line from tank to engine and one vent line. The vent line is the same as you would usually use for the muffler pressure, except you don't need muffler pressure with the OS 120 pumped. I plug the vent line when I'm storing the plane but you need to leave the vent line open when filling the tank and when the engine is running.

Cotman,

Follow the instructions in the manual:

http://manuals.hobbico.com/osm/fs-120s-iii-manual.pdf

From the fuel tank main to the pumps IN, it's labled. from the pump OUT to the engines carb. The pumpers require a vented tank so line #3 {vent} requires no cap.