Air pressure can stop the flow in gravity feed systems.My band saw mill has a gravity feed blade coolant system.The tank is 6 feet above the discharge point.I can see air bubbles moving up the clear tubing.The flow is shut off at the end of the cut.When a new cut is started the valve is opened.You have to wait for the flow to restart.Friends and I had a cutdown Model A Ford we drove around woods roads in the 50s.If it ran out of gas we had to loosen the fuel line to get gas to flow again.My tractor ran out of gas while I was picking up branches.My gas can had a quart of gas in it.Put it in the tank.No start,sediment bowl had an air space.Loosened the bowl no flow.Sprayed starting fluid in the air intake, engine started.Air space disappeared.Still dont know why air bubbles move upward in the sawmill tubing while water is dripping on the blade.We know that air can stop the movement of fluid in baseboard heating systems.The blade lube tank has a vent in it.Windshield washer fluid is used in cold weather.
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Today's Featured Article - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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