Allens Performance Ltd.

What are Jets/valves/metering screws?

December 10th, 2014

Jet: A component controlling flow of a fluid, restricting by means of a calibrated orifice size. In the case of a carburettor this fluid could be fuel or air.

Float Valve: A component designed to allow or prevent the flow of fuel. A float valve prevents fuel flow when the level in your float chamber is correct. Exactly like your toilet cistern.

Metering Screw: A tapered screw allowing adjustable flow restriction of fluid. (In this case fuel and/or air.)

Float Valve

November 26th, 2014

The function of this part is to maintain a consitant fuel level in your carburettor float chamber. As the fuel drops the floats will sink, opening the valve and allowing more fuel to pass through.