The present invention is a system and method for modifying an engine for use with an alternative fuel that needs to be conditioned. Coolant is diverted from the original engine heater core and is used to heat or condition the alternative fuel both in the alternative fuel tank and in a special manifold that heats and circulates the fuel before delivering it to the engine. An electronic control unit monitors the temperature and pressure to ensure proper viscosity and engine operation.

A fuel tank arrangement for a dual fuel internal combustion engine includes a fuel tank arranged to supply liquid fuel to the dual fuel internal combustion engine, wherein the fuel tank arrangement includes a return conduit connected to the fuel tank and configured to supply leaked fuel from the dual fuel internal combustion engine to the fuel tank, wherein the fuel tank arrangement includes a first fuel separation arrangement positioned in fluid communication between the fuel tank and an outlet to an ambient environment thereof.

A movable electrical generation system includes a generator operable to produce a supply of electrical energy, a prime mover operable to drive the generator, and a first fuel supply selectively deliverable to the movable electrical generation system in a first pressure range. A second fuel, different from the first fuel is selectively deliverable to the prime mover in a second pressure range. A controller is operable to automatically deliver the second fuel to the prime mover in response to the first fuel having a pressure outside of the first pressure range.

A fuel enhancement system and method for supplying an engine with a pressurized homogenized mixture of a liquid fuel and a gaseous component. In one embodiment the system comprises a controller; a gaseous component flow control device, a homogenization system, and a gas processor. In another embodiment, the system comprises a controller; a gaseous component flow control device, a device for generating signals indicative of liquid fuel flow, and a homogenization system. Particular embodiments of the gas processor and device for generating signals indicative of liquid fuel flow are also disclosed.

Embodiments of the present invention include a method and computer readable memory for supplying conditioned natural gas to dual fuel engines. Some embodiments of the present invention include an apparatus and process for controlling and optimizing the heating value or BTU per cubic foot of gas (BTU/cf) of the natural gas substituted for diesel fuel in the operation of transport vehicles and field equipment such as generators.

Embodiments of the present invention include a method and apparatus for supplying conditioned natural gas to dual fuel engines.

A method for using biodiesel fuel in compression ignition internal combustion engines is described, the biodiesel fuel being present in a light oil diesel-biodiesel blend with a percentage of biodiesel greater than 7%, in which this percentage of biodiesel higher than 7% causes an increase in the viscosity of the mixture, the increase in viscosity negatively affecting the cold start of the engine; the method reduces the biodiesel concentration to below 7% in the starting phase of the engine, the reduction in concentration being achieved by adding light oil diesel to the light oil diesel-biodiesel blend.

Systems and methods for separating higher octane fuel from a fuel mixture are presented. In one example, higher octane fuel is separated from lower octane fuel and allowed to condense in a fuel tank holding higher octane fuel so that parasitic engine losses are not increased by having to separate higher octane fuel from lower octane fuel a second time. The approach may be applied to fuel systems that include multiple fuel tanks storing different types of fuel.

A tubular debris shield and diverter mounted in a high pressure flow passage within a fuel injector, provide the dual functions of passing the main flow of high pressure fuel with large debris particles to relatively large discharge openings, such as the injector spray holes, while allowing some high pressure fuel to flow through a multitude of very small transverse holes to a sensitive hydraulic component, such an injector control valve circuit. In one embodiment, the tube has a wall thickness in the range of about 0.1 to 0.5 mm at least about 2000 holes with a diameter in the range of about 20 to 30 microns.

An internal combustion engine system is described herein. The system uses a pilot fuel to assist in the ignition of the primary fuel or uses a pilot fuel rather than a primary fuel in some instances. The pilot fuel is stored in one or more pilot fuel storage tanks that are actively managed to maintain a desired physical state of the pilot fuel stored in the one or more storage tanks. A controller detects conditions within the one or more pilot fuel storage tanks and issues control commands depending on the detected conditions. The conditions can include a temperature, a pressure, or a level of the pilot fuel stored in the pilot fuel storage tanks.