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How Carburetors Work

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Positioned between the primary bores, the Q-jet's power piston controls the height of the tapered metering rods in the jets, therefore increasing or decreasing fuel flow. The piston rides on a spring and is pushed shut by engine vacuum at idle.
How Carburetors Work - Carbin' It Easy

 Positioned between the primary bores, the Q-jet's power piston controls the height of the tapered metering rods in the jets, therefore increasing or decreasing fuel flow. The piston rides on a spring and is pushed shut by engine vacuum at idle.  View Related Article

 

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