<P> Liquid gasoline , being denser than air , is slower than air to react to a force applied to it . When the throttle is rapidly opened , airflow through the carburetor increases immediately , faster than the fuel flow rate can increase . This transient oversupply of air causes a lean mixture , which makes the engine misfire ( or `` stumble '' ) -- an effect opposite to that which was demanded by opening the throttle . This is remedied by the use of a small piston or diaphragm pump which , when actuated by the throttle linkage , forces a small amount of gasoline through a jet into the carburetor throat . This extra shot of fuel counteracts the transient lean condition on throttle tip - in . Most accelerator pumps are adjustable for volume or duration by some means . Eventually , the seals around the moving parts of the pump wear such that pump output is reduced ; this reduction of the accelerator pump shot causes stumbling under acceleration until the seals on the pump are renewed . </P>
<P> Liquid gasoline , being denser than air , is slower than air to react to a force applied to it . When the throttle is rapidly opened , airflow through the carburetor increases immediately , faster than the fuel flow rate can increase . This transient oversupply of air causes a lean mixture , which makes the engine misfire ( or `` stumble '' ) -- an effect opposite to that which was demanded by opening the throttle . This is remedied by the use of a small piston or diaphragm pump which , when actuated by the throttle linkage , forces a small amount of gasoline through a jet into the carburetor throat . This extra shot of fuel counteracts the transient lean condition on throttle tip - in . Most accelerator pumps are adjustable for volume or duration by some means . Eventually , the seals around the moving parts of the pump wear such that pump output is reduced ; this reduction of the accelerator pump shot causes stumbling under acceleration until the seals on the pump are renewed . </P>
what does a diaphragm do on a carburetor
what does a diaphragm do on a carburetor
forces a small amount of gasoline through a jet into the carburetor throat
forces a small amount of gasoline through a jet into the carburetor throat