Fuel regulator

In a fuel system including a fuel source, and charge forming apparatus arranged for recirculating excess fuel;

• a regulator comprising a body receiving a movable control spool;
• said body including a supply port adapted for connection to said fuel source, an outlet port, and a return port adapted for connection to said charge forming apparatus for receiving excess fuel therefrom;
• each of said ports communicating with said control spool;
• said spool including fluid throttling means for variably restricting flow from said return port to said outlet port in response to movement of said spool;
• a control chamber operatively connected with said control spool for controlling movement of said spool in accordance with pressure difference between said return port and said control chamber;
• pressure regulator means connected between said control chamber and said return port for charging said control chamber with fluid from said return port;
• and restricting means connected between said control chamber and said outlet port for exhausting fluid from said control chamber;
• said pressure regulator means and restricting means maintaining a selected reference pressure in said control chamber whereby said control spool regulates flow from said return port to adjust the pressure of recirculated fuel toward the value of said reference pressure.