An improved gaseous fuel delivery system and method (10) to improve performance of a gaseous fuel engine (30) by variably maintaining gaseous fuel pressure to the gaseous fuel engine (30).

This device may be used to increase the gaseous fuel proportion in the fuel mixture and comprises a liquid-fuel supply system as well as a gaseous-fuel supply system.

Next, an electromagnetic opening/closing valve (V3) is opened, and the gaseous fuel remaining in a gaseous fuel supply pathway (50) is released out of the system.

The present invention provides an assembly (1) for controlling supply of gaseous fuel to a gas burner.

A gas fuel supply kit which enables existing vehicles (vehicles having gasoline engines or diesel engines) to use a gas fuel, such as hydrogen, in addition to the gasoline or diesel fuel.

The invention concerns an internal combustion engine liquefied gas fuel supply, more particularly a liquefied gas fuel supply system containing at least one main component.

A dual fuel system employs a liquid fuel supply subsystem and a gaseous fuel supply subsystem for an engine.

A particularly suitable application for the present method is high-pressure gaseous fuel supply systems for internal combustion engines.

A shutoff valve (21) is installed in a liquefied fuel passage (15) between the liquefied gas fuel feeding source (16) and the pressure regulator (13).