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 - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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