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How Carburetors Work

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The entire secondary enrichment system on a Q-jet is integrated into the air horn. Surrounded by emulsion tubes on both sides, the two center metering rods control the rate of fuel flow into the secondary bores. The metering rods are raised by a hanger attached to the secondary air valve flap when throttle angle increases.
How Carburetors Work - Carbin' It Easy

 The entire secondary enrichment system on a Q-jet is integrated into the air horn. Surrounded by emulsion tubes on both sides, the two center metering rods control the rate of fuel flow into the secondary bores. The metering rods are raised by a hanger attached to the secondary air valve flap when throttle angle increases.  View Related Article

 

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