A dual fuel system for an internal combustion engine includes a first fuel supply of a liquid pilot fuel, a primary fuel supply of a liquid primary fuel, and a dual fuel injector. The dual fuel injector includes a spill valve fluidly connected with a plunger cavity and movable to control a start of injection and an end of injection, and an admission valve. The admission valve is movable to admit a pilot fuel into the fuel injector, such that the pilot fuel is conveyed through an outlet check to form, within a primary fuel passage fluidly connected to the plunger cavity, a segmented fuel charge of leading pilot fuel and trailing primary fuel by displacing some of the primary fuel. The liquid pilot fuel may be a higher cetane/lower octane liquid fuel, and the primary fuel may be a lower cetane/higher octane liquid fuel.

The present disclosure relates to methods and fuel compositions for reducing cavitation-induced damage in common-rail injection engines operated at high fuel pressures. The fuel compositions include a gasoline-like fuel and one or more cavitation inhibitor additives.

A fuel additive system includes a fuel supply having an intake manifold, a fuel tank, a fuel supply line, and a fuel delivery system. A fuel additive supply is fluidly connected to the fuel supply for adding fuel additive to fuel from the fuel supply. The fuel additive supply includes a fuel additive tank and a fuel additive supply line connecting the fuel additive tank to the fuel supply.

The present disclosure relates to methods and fuel compositions for reducing cavitation-induced damage in common-rail injection engines operated at high fuel pressures. The fuel compositions include a gasoline-like fuel and one or more cavitation inhibitor additives.

The present invention relates to a fuel injection arrangement for a diesel type engine configured to use carbonaceous aqueous slurry fuels. The fuel injection arrangement includes an injector nozzle for injecting fuel into a combustion chamber; a pump chamber housing a fuel pumping element for generating a pressurised fuel flow to the injector nozzle along an injection path between the pumping element and the injector nozzle; and a check valve connected to a fuel supply for regulating and supplying fuel to the injection path via a check valve outlet. A region immediately downstream of the check valve outlet defines an outlet region and the check valve is arranged to expose the outlet region to the pressurised fuel flow to facilitate flushing of the outlet region during fuel flow between the pumping element and the injector nozzle.

A fuel additive system includes a fuel supply having an intake manifold, a fuel tank, a fuel supply line, and a fuel delivery system. A fuel additive supply is fluidly connected to the fuel supply for adding fuel additive to fuel from the fuel supply. The fuel additive supply includes a fuel additive tank and a fuel additive supply line connecting the fuel additive tank to the fuel supply.

A fuel injection unit for assembly to a cylinder head and for injecting first and second fuel to a cylinder of an internal combustion piston engine includes a first fuel feeding section, a second fuel feeding section, a pressure accumulator in the first fuel feeding section, and a flow fuse arranged in the first fuel feeding section between the pressure accumulator and a fuel injection valve of the first fuel feeding section. The fuel injection valve includes a fuel handling section and control section, and the control section is a hydraulic control section fluidly separated from the fuel handling section.

A dual fuel system for an internal combustion engine includes a first fuel supply of a liquid pilot fuel, a primary fuel supply of a liquid primary fuel, and a dual fuel injector. The dual fuel injector includes a spill valve fluidly connected with a plunger cavity and movable to control a start of injection and an end of injection, and an admission valve. The admission valve is movable to admit a pilot fuel into the fuel injector, such that the pilot fuel is conveyed through an outlet check to form, within a primary fuel passage fluidly connected to the plunger cavity, a segmented fuel charge of leading pilot fuel and trailing primary fuel by displacing some of the primary fuel. The liquid pilot fuel may be a higher cetane/lower octane liquid fuel, and the primary fuel may be a lower cetane/higher octane liquid fuel.

One approach to providing atomic oxygen for the purpose of promoting more rapid and compact combustion is to disperse a low concentration of an atomic oxygen precursor, such as nitrous oxide (N.sub.2O), into the compressed air in the cylinder before or close to the time of ignition. The introduction of N.sub.2O may take place in the intake manifold, directly into the combustion chamber through a small orifice in the base of the fuel injector or a small nozzle located elsewhere in the cylinder head, or the N.sub.2O can be added as a solute to the injected fuel.

The present invention relates to a fuel injection arrangement for a diesel type engine configured to use carbonaceous aqueous slurry fuels. The fuel injection arrangement includes an injector nozzle for injecting fuel into a combustion chamber; a pump chamber housing a fuel pumping element for generating a pressurised fuel flow to the injector nozzle along an injection path between the pumping element and the injector nozzle; and a check valve connected to a fuel supply for regulating and supplying fuel to the injection path via a check valve outlet. A region immediately downstream of the check valve outlet defines an outlet region and the check valve is arranged to expose the outlet region to the pressurised fuel flow to facilitate flushing of the outlet region during fuel flow between the pumping element and the injector nozzle.