throttle arm 56 is moved against its pin 66 lever arm 55 is rotated causing it to engage ledge 43a of extension 43 forcing the piston assembly 32 to the right as shown in fig4 thereby moving the piston assembly away from the end of nose configuration 27 causing gasoline to flow into the manifold through openings 67 in any given implementation of the invention one or the other of the two springs 64 and the piston 62 may be omitted before the engine operating carburetor 10 is started piston assembly 32 is held in the fully leftward position shown in fig4 by spring or springs 33 so that the point or end of the conical nose configuration 27 is forced against piston portion 42 with 34 o ring 34 65 which surrounds rod 30 near its junction with the top surface of piston member 42 and the knurled nut o ring assembly fitting tightly against the open end of flange 25 gasoline from reservoir 16 enters the opening 30a in flange 25 through tube 24a under the action of gravity and surrounds rod 30 in metering column 31 all the way down to the lower end of rod 30 where it is blocked from further movement formed by 34 o.