This is for the benefit of anyone with questions about using Propane for little engine fuel. The bottle on the right is Coleman Fuel, 16/4oz/465g. It does require a regulator, and my ON/OFF valve in this case IS a regulator. You probably will have a very difficult time finding one, as they have not been made for a long time. I managed to get a couple from the now retired head of R&D for Coleman for many years. If you can't find one, just use an ON/OFF valve and make a regulator from Jerry Howell's plans. In turn, the propane should pass through a "Demand Valve". this is a "double" valve and is "home built", using Tecumseh carburetor parts. The purpose of this demand valve is to stop flow if there is no 'demand.' An engine produces a vacuum at the intake ... which "pulls" fuel through the lines. If your propane line becomes disconnected at the engine, propane would continue to flow without this valve. This is a very necessary part of the propane setup ... called SAFETY!!! The next 2 photos show information about the Tecumseh carburetor kits used in building the demand valve.

The torch has nothing to do with the illustration, except to show someone on the other side of the big pond that there is more than one way to buy small quantities of propane.