[1966Snaake]

What you have here is a little tiny piece of silicon that was used to seal your fuel inlet to the tank. It will intermittently get picked up by the fuel pump and clog at the inside of the tank at the strainer thus shutting down gasoline flow upward towards the engine. This happened to me and just about drove me nuts finding it. Drain the tank, drop the tank, open the float access and find the silicon. Realign the tank, but temporarily seal the input and output tubulars. Add 0.5 psi air to the tank (this will make it swell vertically), slide the tank easily in between the frame rails, release the air pressure, reconnect input and output tubulars, fill with gasoline and enjoy cruising for a change without worrying about an abrupt flameout.