Patent 7431017 was granted and assigned to Caterpillar Inc. on October, 2008 by the United States Patent and Trademark Office.
A fuel system for an engine is disclosed. The fuel system has a first source of fuel at a first pressure, and a second source of fuel at a second pressure. The fuel system also has a fuel injector configured to receive fuel from the first and second sources and inject fuel into a combustion chamber of the engine. The fuel system further has a valve operable to selectively direct fuel from the first and second sources to the fuel injector. The fuel system additionally has a controller in communication with the valve and being configured to affect operation of the valve and a resulting fuel pressure based on a desired injection pressure.