| 摘要 |
Methods and systems to deliver fuel to an engine at a predetermine fuel delivery pressure, such as about zero or a very low fuel pressure, are provided. In some embodiments, a fuel delivery circuit may include a pressure regulating device configured to open a fuel escape path at a predetermined pressure. By providing the fuel escape path, the fuel delivery circuit can maintain a fuel pressure at an outlet of the pressure regulating device at about the predetermined pressure. The fuel delivery circuit may also include a pressure drop device, such as a fuel filter, that requires and causes a pressure drop when fuel flows through the pressure drop device. In some embodiments, the predetermined pressure of the pressure regulating device is about the same as the pressure drop of the pressure drop device. In some embodiments, the pressure regulating device may be integrated inside the pressure drop device. |
