Direct metering fuel system with constant servo flow

A direct metering fuel supply system, comprising:

• a fuel pump having a pump inlet and a pump outlet, the fuel pump configured to be driven at a rotational speed and operable, upon being driven, to draw fuel into the pump inlet and discharge fuel out the pump outlet at a fuel flow rate that is dependent on the rotational speed;
• a burn flow fuel line in fluid communication with the pump outlet to receive a first portion of the fuel discharged therefrom;
• a servo flow fuel line in fluid communication with the pump outlet to receive a second portion of the fuel discharged therefrom;
• a servo regulator mounted on the servo flow fuel line and configured to maintain fuel flow rate in the servo flow fuel line at a substantially constant fuel flow rate regardless of fuel flow rate in the burn flow fuel line.

A method of controlling fuel flow in a direct metered fuel supply system, comprising the steps of:

• discharging fuel from a fuel pump at a commanded fuel flow rate;
• directing a first portion of the fuel discharged from the fuel pump into a burn flow fuel line;
• directing a second portion of the fuel discharged from the fuel pump into a servo flow fuel line;
• and
• maintaining fuel flow rate in the servo flow fuel line at a substantially constant fuel flow rate regardless of fuel flow rate in the burn flow fuel line.