Combined pressure regulating and fuel flow system

A fuel delivery system for providing a desired fuel flow to an engine, comprising:

• a first pump means for providing fuel;
• a metering means for providing the desired fuel flow to the engine, said metering means in fluid communication with said first pump means for receiving said fuel;
• and
• a combined pressure regulating and motive flow valve for setting a pressure differential across said metering means as required by the desired fuel flow, comprising:
• a spool valve having a first end in fluid communication with said pump means for sensing a first pressure of said fuel and a second end in fluid communication with said metering means for sensing a second pressure of the desired flow;
• a first port in fluid communication with said pump means for receiving said fuel;
• a second port in fluid communication with a first bypass line;
• and,
• a third port in fluid communication with a second bypass line, wherein said spool valve is in a first position upon engine startup for isolating said second and third ports from said first port, wherein as a flow of said fuel increases, said spool valve transitions placing said first port in fluid communication with said second port bypassing a first portion of said fuel through said first bypass line for adjusting said differential pressure and wherein as said flow of said fuel further increases said spool valve transitions placing said first port in fluid communication with said second port bypassing a first portion of said fuel through said first bypass line and placing said first port in fluid communication with said third port bypassing a second portion of said fuel through said second bypass line for adjusting said differential pressure.