Common Rail Diesel. These engines instead of relying on high pressure fuel from a timed mechanical injection pump utilyze a common high pressure fuel rail and the injectors are usually controlled electronically with help from fuel pressure. Some like the new 3.0 Mercedes in the GC and Sprinter use a Piezo injector, as does the new 08 Super Duty Power Joke which does not need additional help from either a high pressure fuel or oil pump.
I know this is over simplified but you get the idea right?
