Bark,

I think you have your engine hooked up wrong. How much experience do you have with four-stroke engines? Four stroke engines have to have the crankcase vented to the atmosphere or they will not lubricate properly. Where exactly is this fitting on the engine that you are connecting to the tank? I do not have a FS-70, but have had several OS 4-strokes, and I've never seen one that has a line on the actual engine that you connect to the tank. Do not run the engine with the crankcase vent fitting connected to anything. This will prevent the bottom end of the engine from lubricating properly and will ruin the engine very quickly.