Quote:
Originally Posted by gled49
The amount of air moving the sensor plate is how the system works.
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^^^ This, what he said.
Known quantity of metered air needs to move the sensor plate the correct/anticipated amount - because the plate moves the fuel distributor piston, to which it is directly (mechanically) connected. Otherwise, incorrect amount of fuel delivered.
A misaligned sensor plate with too large a gap will allow air to pass without moving the plate as much as it should. Lean mixture, stubborn high idle - or both. Perhaps even binding/wear in the venturi.
If there is a safety cutoff fitted and the plate doesn't sit where expected to activate the switch, this can also result in "fuel pump doesn't switch on when motor runs".