Entering fuel injection system of a diesel engine

Claim 2

In a fuel system for an internal combustion engine having fuel injection means with cutoff means, relay means connectable to one or more engine sensors and to said cutoff means, a fuel supply tank, an automatic engine air removal and a shut off device located outside said fuel supply tank and comprising: housing means forming a fuel chamber having an inlet passage adapted to be connected to said fuel supply having an outlet passage adapted to be connected to said engine fuel injection means; conduit means connected to said outlet passage and extending downwardly therefrom within said fuel chamber, said conduit means having an inlet at its lower end located below said inlet passage and; means within said chamber for sensing the level of fuel therein and for providing a signal to said relay means for stopping the engine when the fuel in said tank becomes exhausted but before the fuel in said chamber reaches a predetermined lower level within said chamber, thereby preventing air from entering said fuel injection means of the engine fuel system and; fluid retainer means at the lower end of said conduit means within said chamber for holding a quantity of fuel and thereby preventing air from entering said conduit means even if the level of fuel in said chamber should fall below the end of said conduit means.

Claim 3

The device as described in claim 1 wherein said fluid retainer means comprises a cup-like receptacle surrounding the end of and fixed to one side of said conduit means.

Claim 4

In a fuel system for an internal combustion engine having fuel injection means with cutoff means, relay means connectable to one or more engine sensors and to said cutoff means, a fuel supply tank, an automatic engine air removal and a shut off device located outside said fuel supply tank and comprising: housing means forming a fuel chamber having an inlet passage adapted to be connected to said fuel supply and having an outlet passage adapted to be connected to said engine fuel injection means; conduit means connected to said outlet passage and extending downwardly therefrom within said fuel chamber, said conduit means having an inlet at its lower end located below said inlet passage; means within said chamber for sensing the level of fuel therein and for providing a signal to said relay means for stopping the engine when the fuel in said tank becomes exhausted but before the fuel in said chamber reaches a predetermined lower level within said chamber, thereby preventing air from entering said fuel injection means of the engine fuel system and; means forming an air relief passage from an upper end of said chamber adapted to connect with a return line to said fuel supply tank including an orifice extending through said housing means located near said outlet passage.

Claim 5

In a fuel system for an internal combustion engine having fuel injection means with cutoff means, relay means connectable to one or more engine sensors and to said cutoff means, a fuel supply tank, an automatic engine air removal and a shut off device located outside said fuel supply tank and comprising: housing means forming a fuel chamber having an inlet passage adapted to be connected to said fuel supply and having an outlet passage adapted to be connected to said engine fuel injection means; conduit means connected to said outlet passage and extending downwardly therefrom within said fuel chamber, said conduit means having an inlet at its lower end located below said inlet passage; means within said chamber for sensing the level of fuel therein and for providing a signal to said relay means for stopping the engine when the fuel in said tank becomes exhausted but before the fuel in said chamber reaches a predetermined lower level within said chamber, thereby preventing air from entering said fuel injection means of the engine fuel system and; means forming an air relief passage from an upper end of said chamber adapted to connect with a return line to said fuel supply tank including an orifice extending through said housing means located near said outlet passage.

Claim 6

In a fuel system for an internal combustion engine having fuel injection means with cutoff means, relay means connectable to one or more engine sensors and to said cutoff means, a fuel supply tank, an automatic engine air removal and shut-off device located outside of said fuel supply tank and comprising: housing means forming a fuel chamber having an inlet passage adapted to be connected to said fuel supply and having an outlet passage adapted to be connected to said engine fuel injection means; conduit means connected to said outlet passage and extending downwardly therefrom within said fuel chamber, said conduit means having an inlet end located below said inlet passage; and a float switch within said chamber for sensing the level of fuel therein and for providing a signal to said relay means for stopping the engine when the fuel in said tank becomes exhausted but before the fuel in said chamber reaches a predetermined lower level within said chamber, thereby preventing air from entering said fuel injection means of the engine fuel system, said float switch comprising a tubular member that extends to a predetermined depth in said chamber, a conductor in said tubular member having a magnetically sensitive element at its bottom end which conducts current only when subjected to a magnetic field, and a buoyant member adapted to move up and down with the level of fuel in said chamber and having a magnet attached thereto, whereby when the fuel level in the chamber falls and reaches that of said sensitive element, current can flow in said conductor to provide a shut off signal to said fuel injection means.

Claim 7

In a fuel system for an internal combustion engine having fuel injection means with cutoff means, relay means connectable to one or more engine sensors and to said cutoff means, a fuel supply tank, an automatic engine air removal and shut-off device located outside of said fuel supply tank and comprising: housing means forming a fuel chamber having an inlet passage adapted to be connected to said fuel supply and having an outlet passage adapted to be connected to said engine fuel injection means; conduit means connected to said outlet passage and extending downwardly therefrom within said fuel chamber, said conduit means having an inlet end located below said inlet passage; and a float switch within said chamber for sensing the level of fuel therein and for providing a signal to said relay means for stopping the engine when the fuel in said tank becomes exhausted but before the fuel in said chamber reaches a predetermined lower level within said chamber, thereby preventing air from entering said fuel injection means of the engine fuel system, said float switch comprising a tubular member that extends to a predetermined depth in said chamber, a conductor in said tubular member having a magnetically sensitive element at its bottom end which conducts current only when subjected to a magnetic field, and a buoyant member adapted to move up and down with the level of fuel in said chamber and having a magnet attached thereto, whereby when the fuel level in the chamber falls and reaches that of said sensitive element, current can flow in said conductor to provide a shut off signal to said fuel injection means.