Abstract: The surface tension tank is designed to feed a liquid propellant to a main engine and to at least one auxiliary engine or receiver of a space vehicle or satellite. The tank comprises a common shell containing at least two compartments of different sizes that are separated by a diaphragm provided with at least one strainer for providing communication between the large compartment and the small compartment. A pressurization gas feed orifice opens out into the large compartment. A liquid expulsion device is placed in the small compartment, and means for delivering liquid to the members to be fed are essentially disposed along a direction that differs little from the direction of the main acceleration imparted by the main engine, in such a direction as to accelerate liquid flow therealong.