in fig1 b substantially emptying fuel chamber 104 of any residual fuel further because operation of the engine is stopped in this arrangement the partial vacuum developed in the engine intake tract will eventually diminish i e pressure will increase back towards atmospheric pressure as a result the connection of drain reservoir 130 to carburetor 102 via pressurization line 114 stops acting to reduce the pressure in drain reservoir 130 accordingly if a pressure release mechanism is provided the pressure in drain reservoir 130 can equalize with the pressure in fuel tank 120 for example as discussed above orifice 138 can operate to equalize the pressure in drain reservoir 130 with the pressure in outlet portion 108 during operation of the engine equalization of these pressures results in the air pressure in drain reservoir 130 being reduced to be at or near the partial vacuum established at outlet portion 108 when engine operation is discontinued however the pressure at outlet portion 108 will tend to gradually increase towards atmospheric pressure and thus the pressure equalization effected by orifice 138 can allow the pressure in drain reservoir 130 to likewise gradually return to atmospheric pressure once the pressure in drain reservoir 130 is sufficiently increased such that there is substantially no pressure differential between drain reservoir 130 and fuel tank 120 fuel can flow through first one way valve 134 into fuel tank 120 in addition the operation of first control valve 142 and second control valve 144 can further be linked to an ignition control switch 146 used to control the ignition kill specifically when ignition control switch 146 is in an u201c on u201d position see e.