A fuel system for use in an internal combustion engine includes a plurality of
fuel injectors, each injector including at least one capillary flow passage, the
at least one capillary flow passage having an inlet end and an outlet end, a heat
source arranged along the at least one capillary flow passage, the heat source
operable to heat a liquid fuel in the at least one capillary flow passage to a
level sufficient to convert at least a portion thereof from the liquid state to
a vapor state, and a valve for metering fuel to the internal combustion engine,
a controller to control the power supplied to the heat source of each of the plurality
of fuel injectors to achieve a predetermined target temperature, a sensor for use
in determining engine air flow and a sensor for measuring a value indicative of
degree of engine warm-up of the internal combustion engine.
