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A fuel flow control system to control fuel by regulating fuel pressure includes an inlet, an outlet, and a bypass passage. A variable orifice valve controls the flow of fuel between the inlet and the outlet in conjunction with a fixed orifice of an engine such that the relationship between pressure

A fuel flow control system to control fuel by regulating fuel pressure includes an inlet, an outlet, and a bypass passage. A variable orifice valve controls the flow of fuel between the inlet and the outlet in conjunction with a fixed orifice of an engine such that the relationship between pressure and fuel flow is substantially linear. A pressure-regulating valve accommodates pressure fluctuations in the system. A dual torque motor opens in proportion to the level of applied electrical current to control fuel pressure and thereby fuel flow.

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A fuel flow control system to control fuel by regulating fuel pressure includes an inlet, an outlet, and a bypass passage. A variable orifice valve controls the flow of fuel between the inlet and the outlet in conjunction with a fixed orifice of an engine such that the relationship between pressure

A fuel flow control system to control fuel by regulating fuel pressure includes an inlet, an outlet, and a bypass passage. A variable orifice valve controls the flow of fuel between the inlet and the outlet in conjunction with a fixed orifice of an engine such that the relationship between pressure and fuel flow is substantially linear. A pressure-regulating valve accommodates pressure fluctuations in the system. A dual torque motor opens in proportion to the level of applied electrical current to control fuel pressure and thereby fuel flow. ncluding a flow area, an outlet and a passage, said flow area varying in proportion to fuel pressure such that a relationship between fuel flow and pressure is substantially linear, and said passage creating a pressure differential in fuel pressure between said inlet and said outlet; a pressure-regulating valve in fluid communication with said variable orifice valve to control said pressure differential; a pressure setting valve in fluid communication with said pressure regulating valve to adjust said pressure differential such that said flow fuel through said system is controlled by setting said pressure differential. 14. The system of claim 13, wherein said variable orifice includes a variable orifice spool slidably disposed within a bore, said variable orifice spool biased against said fuel pressure from said inlet. 15. The system of claim 14, wherein said bore includes said passage, said passage routes said flow of fuel out of said bore then back into said bore. 16. The system of claim 14, wherein said variable orifice spool includes first and second lands and a recess, said first land proportionally blocking said passage to form a first flow area, said second land proportionally blocking said outlet to form a second flow area, and said fuel flow reentering said variable orifice bore at a point corresponding to said recess of said variable orifice spool. 17. The system of claim 16, wherein said first and second lands of said spool valve are positioned to size said second flow area relative to said first flow area to create said drop in fuel pressure between said inlet and said outlet.