Fuel conditioning module for reducing air in a fuel injection system

This invention relates generally to fuel injection systems, and more particularly to a method and apparatus for separating air out of fuel upstream from the fuel injectors. Over aeration of fuel has been identified as a problem in some fuel injection systems. For instance, engineers have learned that it is desirable to reduce the amount of air in the fuel circulation plumbing of a pump and line fuel injection system in order to reduce timing retardation of the fuel injection and avoid engine power loss. A fuel conditioning module addresses this problem by separating out the air from the fuel before reaching the fuel injectors. The fuel conditioning module includes an inlet cavity separated from an outlet cavity by a baffle. An inlet passage opens to the inlet cavity, and an outlet passage opens to the outlet cavity at locations elevationally below the top of the baffle. A vent passage opens to the outlet cavity at a location elevationally above the top of the outlet passage. When the fuel air mixture flows over the baffle, the air is directed into the vent passage and the relatively pure fuel is directed to the outlet passage for delivery to the fuel injectors.