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Todays fuel injectors are electric soleniod controlled mixing valves of the pintle type. The soleniod is either open or closed, the frequency or duration of opening controls the fuel metering. Fuel pressure changes are made by a pressure regulator, which can enrichen the mixture when there is a demand for maximum fuel enrichment. As the soleniod opens fuel enters the injector passing through a basket filter and travelling through an orifice past the tapered pintle forming a fine spray of liquid, much like a garden hoses spray only much finer.
