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Sorry to contradict Richard.....The flap moves in response to air flow....futher it moves , the more fuel is delivered.
The air metering flap is connected to the delivery piston by a balance arm and a small adjusting screw sets the basic. Pushing down on metering flap, the fuel is increased.
CPR fails in over lean condition...increases the control pressure on the delivery piston and with this extra pressure system will need more air flow for same movement of air metering flap. ( Wider throttle opening.)
All air entering the engine is known as 'contolled air' or 'metered air'.
...idle volume is also 'metered air' and idle speed is set by restriction of idle control valve, but is still monitored by the metering flap.......any other air is known as 'false air'....or 'unmetered air'......an air leak.
So, if you push down on the metering flap ...on a down draft meter, it richens up the air/fuel ratio.
Now, on an updraft types, such as VW uses, pushing down means your leaning it out.
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