PURPOSE:To prevent an oil level at oil feeding from exceeding a predetermined full level of a tank by a method wherein either one or both of an oil feeding vessel and a kerosene tank are constituted so as to be airtight and harmonizing power of internal pressures thereof are utilized. CONSTITUTION:An oil feeding tube 4 and an air commnicating tube 5 are attached to an airtight oil feeding vessel 1 airthightly, therefore, when the oil is fed to a tank 8 with a pump 3, an internal pressure of the oil feeding vessel 1 is lowered and open air is induced into the oil feeding vessel 1 through the air commuicating tube 5. When a rising oil level due to the oil feeding raches a suction port 10 of the air communicating tube 5, which is a predetermined full level 11 of the tank, kerosene is induced into the air commuicating tube 5 by an atmospheric pressure instead of the inducing of the open air from this moment. Thereafter, the excess kerosene is returned to the oil feeding vessel 1 and is circulated, therefore, the oil level will never exceed the full level of the tank.
展开▼
