Patent ID: 7506638

Claim:
A fuel delivery system for an engine comprising: diesel fuel delivery means for delivering diesel fuel to the engine; a second fuel delivery means for delivering liquid gas, concurrently with the first fuel, to the engine, the second delivery means comprising: an injector for injecting the liquid gas into the engine; control means for controlling the injector; means for maintaining the liquid gas fuel in a liquid state after the liquid gas fuel leaves a storage container and whilst the liquid gas is in the injector so the liquid gas fuel is injected in the liquid state by the injector; and a fuel bubble collection system, comprising: means for collecting vapour bubbles from the liquid gas which are generated when liquid gas is supplied to the injector; a liquid gas system for receiving the bubbles and for debubbling the liquid gas; and return means for returning the debubbled liquid gas in the form of vapour to the engine.