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 (Fig. 3). 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.