Fuel system including a pressure regulator

A fuel system that comprises a tank, a pump, a flow-through pressure regulator, and piping connecting these components and an internal combustion engine. The flow-through pressure regulator can maintain a substantially constant noise output from low fuel flow rates to high fuel flow rates. Further, the pressure of fuel in the regulator at a maximum fuel flow rate can be made substantially equal to or less than the pressure of fuel in the regulator at a minimum fuel flow rate.