US 5,664,532 AGranted

Universal fuel priming system

OwnerRex David Augustinventor

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Abstract

A combined fuel supply and priming system for diesel engine is disclosed. The fuel supply portion of this system may be conventional and may include a fuel supply tank, a primary fuel filter, a fuel pump, a secondary fuel filter, and a plurality of injectors for injecting diesel fuel into combustion chambers of a diesel engine. A fuel line connects these parts so that diesel fuel flows through the parts in the order named. The fuel supply system may further include a return line leading from the injectors back to the fuel supply tank. The priming portion of the system includes a manually operated primer pump, which may be connected either in line with the other parts or via a bypass connection. When the primer pump is connected in line, it may be placed between the fuel pump and the secondary fuel filter. In line connection provides a single flow path for fuel used either for priming or for normal operation. Alternatively, the primer pump may be connected to the primary fuel line via a bypass, so that the primer fuel bypasses the fuel pump. In a bypass connection, the bypass line has an upstream leg extending from the primary fuel line upstream of fuel tank and a downstream leg extending from the primer pump to the primary fuel line downstream of the fuel pump. The primer pump is operated manually. This system in universally applicable to diesel engines.

Claims5

Dependent claims

A fuel supply and priming system for a diesel engine, said system comprising:

(a) a fuel pump having an inlet and an outlet
(b) a manually operated primer pump, having an inlet, and outlet and a manual actuator for operating said pump;
and
(c) fuel conduit means for supplying liquid fuel from a fuel tank to one or more injectors for injecting liquid fuel into said engine, said fuel conduit means providing at least one flow path from said fuel tank to said one or more injectors and including:
(1) a primary fuel line passing through said fuel pump and having an upstream portion extending from said fuel tank to the inlet of said fuel pump and a downstream portion extending from the outlet of said fuel pump to said one or more injectors, and
(2) means providing fluid communication from said primer pump to said fuel tank and to said one or more injectors, the last mentioned means including a connection from the outlet of said primer pump to the downstream portion of said primary fuel line, whereby all fuel passing through either said fuel pump or said primer pump flows in a single stream into said one or more injectors;
wherein said primer pump is connected via a bypass to a source of fuel upstream of said fuel pump and to said downstream portion of said primary fuel line, whereby fuel passing through said primer pump bypasses said fuel pump, said bypass including an upstream passageway extending from said source of fuel upstream of said fuel pump to said inlet of said primer pump, and a downstream passageway extending from the outlet of said primer pump to said downstream portion of said primary fuel line.

4 more elements

Dependencies are inferred from the claim text.