Situated underneath the fuel tank (one at each side) at the rear end. Must be shut off when the machine is left standing for more than a minute or so. The plungers work horizontally. To open, the hexagon knob (marked PUSH-ON) is pushed towards the body of the tap. To close, press the round milled knob (marked PUSH-OFF). Use only one tap and the other side will then act as a small reserve supply which is usually sufficient to run the machine about 3 to 4 miles. Either side may be used as the main supply. Always refuel as soon as possible after being forced to call upon the reserve and at once close the "reserve" tap again.