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 - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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