NOVELTY - The system has a microprocessor located in a body of a fuel injector e.g. diesel fuel injector. The injector injects fuel, where the fuel is injected by the opening of a valve element (74) e.g. ferromagnetic valve. A fuel ignition unit e.g. spark, ignites the fuel, and is integral to the injector and located near the element. The element is opened with one of a stationery dielectric fiber optic cable (60) or rod connected to an electromechanical actuator. The cable or the rod are electrically insulated and comprise a fiber-optic element for communicating combustion data to the microprocessor.    USE - Multi-fuel injection system for injecting fuel e.g. cryogenic liquid fuel such as cryogenic methane and cryogenic hydrogen, cryogenic solid fuel, cryogenic gaseous fuel, solid fuel, liquid fuel such as petrol and diesel, and gaseous fuel such as hydrogen, producer gas, ethane, methane, propane and butane, to a heat engine e.g. gasoline engine, petrol engine and diesel engine, a fuel cell (all claimed), and an internal-combustion engine in a hybrid vehicle. Can also be used for fuel alcohols such as ethanol, isopropanol and methanol.    ADVANTAGE - The system interchangeably stores and utilizes a wide variety of fuels as gases, vapors, liquids, and slush mixtures of liquid and solids and efficiently utilizes the fuels as stratified charge combustants in unthrottled air of a heat engine. The system can optimize the use in a fuel cell or in an internal-combustion engine with virtually any fluid fuel regardless of octane rating, cetane rating, viscosity, vapor pressure, or burn rate regardless of the compression ratio of the engine. The system eliminates dribbles of fuel into the combustion chamber to avoid fuel loss during exhaust cycle, back work and/or heat loss by inadvertent fuel deliveries during exhaust, intake and compression periods. The system eliminates admission of fuel into the combustion chamber to avoid loss of intended torque production. The system minimizes heat loss by stratified-charge combustion within excess air, thus improving thermal efficiency of the engine. The system can readily replace plugs such as spark plugs in gasoline engines and diesel fuel injectors in diesel engines to enable delivery of multiple fuel selections and ignition of the fuel selections to produce stratified charge combustion. The system can utilize hydrogen to transfer heat from rotating electrical equipment, to overcome emissions of hydrocarbons, particulates from heat engines and carbon compounds, to overcome emissions of nitrous compounds from heat engines, and to improve generator efficiency in hybrid and distributed energy applications.    DETAILED DESCRIPTION - The valve element is made from one of sapphire, quartz, glass and a high-temperature polymer.    DESCRIPTION OF DRAWING(S) - The drawing shows a longitudinal sectional view of a component assembly of a multi-fuel injection system.    Spark injector device (28)    Spring (36)    Armature (48)    Stationery dielectric fiber optic cable (60)    Valve element (74)