Patent ID: 7861696

Claim:
A system for multi-fuel injection within an engine from at least two fuel supplies, the engine having an injector including an injector pump, the improvement comprising: a manifold in fluid communication with and downstream of the at least two fuel supplies wherein fuels from the at least two fuel supplies are mixed to produce a fuel mixture as controlled by a combination flow sensor and control valve located in-line between each fuel supply and the manifold; and a high-pressure positive displacement pump in fluid communication with and downstream of the manifold and in-line between the manifold and the engine, whereby the fuel mixture is brought to higher pressure before being injected by the injector; wherein: a first fuel is in a liquid state as supplied by a first fuel supply and delivered to the manifold; and a second fuel is in a gaseous state as supplied by a second fuel supply and delivered to the manifold, whereby the fuel mixture is a liquid-gaseous fuel mixture and the positive displacement pump pressurizes the liquid-gaseous fuel mixture prior to injection.