The metered fuel is delivered by the injector to a pressurized flow divider which distributes the fuel to the individual cylinders via dedicated lines and nozzles. The flow divider is a simple spring-loaded valve that is sealed to atmosphere by a diaphragm. The valve movement and resulting fuel flow is strictly regulated by pressure acting on the valve. At idle, the fuel pressure must build to overcome the spring and diaphragm load in order to move and open the fuel ports. Metering at this speed is primarily a function of the flow divider but as flow increases and the valve opens, the fuel nozzles become the primary system metering components.