A carburetor (10; 310) for use with an internal combustion engine, the carburetor comprising: a body (14; 314) including an air/fuel passageway (18; 318) and a fuel passageway (166; 466) formed therein; a throttle valve (26; 326) positioned in the air/fuel passageway (18; 318); a fuel bowl (30; 330) coupled to the body (14; 314); a fuel bowl chamber (34; 334) at least partially defined by the fuel bowl (30; 330); a one-piece fuel-metering insert (42; 342) coupled to the body (14; 314), the insert including an idle circuit passageway (62; 362) having a first end (130; 430) in fluid communication with the fuel passageway (166; 466) and a second end (118; 418) in fluid communication with the fuel bowl chamber (34; 334), the idle circuit passageway (62; 362) configured to carry fuel from the fuel bowl chamber (34; 334) to the air/fuel passageway (18; 318) via the fuel passageway (166; 466) during engine operation when the throttle valve (26; 326) is oriented in a substantially closed position; and a main circuit passageway (66; 366) having a first end (158; 458) in fluid communication with the air/fuel passageway (18; 318) and a second end (122; 422) in fluid communication with the fuel bowl chamber (34; 334), the main circuit passageway (66; 366) configured to carry fuel from the fuel bowl chamber (34; 334) to the air/fuel passageway (18; 318) during engine operation when the throttle valve (26; 326) is opened from the substantially closed position, wherein the body (14; 314) includes a hollow stem (46; 346) extending into the fuel bowl chamber (34; 334), and wherein the insert (42; 342) is at least partially positioned within the stem(46; 346). a body (14; 314) including an air/fuel passageway (18; 318) and a fuel passageway (166; 466) formed therein; a throttle valve (26; 326) positioned in the air/fuel passageway (18; 318); a fuel bowl (30; 330) coupled to the body (14; 314); a fuel bowl chamber (34; 334) at least partially defined by the fuel bowl (30; 330); a one-piece fuel-metering insert (42; 342) coupled to the body (14; 314), the insert including an idle circuit passageway (62; 362) having a first end (130; 430) in fluid communication with the fuel passageway (166; 466) and a second end (118; 418) in fluid communication with the fuel bowl chamber (34; 334), the idle circuit passageway (62; 362) configured to carry fuel from the fuel bowl chamber (34; 334) to the air/fuel passageway (18; 318) via the fuel passageway (166; 466) during engine operation when the throttle valve (26; 326) is oriented in a substantially closed position; and a main circuit passageway (66; 366) having a first end (158; 458) in fluid communication with the air/fuel passageway (18; 318) and a second end (122; 422) in fluid communication with the fuel bowl chamber (34; 334), the main circuit passageway (66; 366) configured to carry fuel from the fuel bowl chamber (34; 334) to the air/fuel passageway (18; 318) during engine operation when the throttle valve (26; 326) is opened from the substantially closed position, an idle circuit passageway (62; 362) having a first end (130; 430) in fluid communication with the fuel passageway (166; 466) and a second end (118; 418) in fluid communication with the fuel bowl chamber (34; 334), the idle circuit passageway (62; 362) configured to carry fuel from the fuel bowl chamber (34; 334) to the air/fuel passageway (18; 318) via the fuel passageway (166; 466) during engine operation when the throttle valve (26; 326) is oriented in a substantially closed position; and a main circuit passageway (66; 366) having a first end (158; 458) in fluid communication with the air/fuel passageway (18; 318) and a second end (122; 422) in fluid communication with the fuel bowl chamber (34; 334), the main circuit passageway (66; 366) configured to carry fuel from the fuel bowl chamber (34; 334) to the air/fuel passageway (18; 318) during engine operation when the throttle valve (26; 326) is opened from the substantially closed position, wherein the body (14; 314) includes a hollow stem (46; 346) extending into the fuel bowl chamber (34; 334), and wherein the insert (42; 342) is at least partially positioned within the stem(46; 346).