Front end rate shaping valve concept for a fuel injection system

A fuel injection system comprising:

• a nozzle supply valve moveable between a first position in which a nozzle supply passage is relatively restricted via a restricted passage and a second position in which said nozzle supply passage is relatively unrestricted via said restricted passage and a flowpath defined between an outer surface of a nozzle supply valve member and an injector body;
• said nozzle supply valve being biased by a first biaser toward said first position when fluid pressure in said nozzle supply passage upstream from said nozzle supply valve is below a first predetermined pressure;
• a nozzle outlet valve moveable between an open position in which said nozzle supply passage is open to a nozzle outlet, and a closed position in which said nozzle supply passage is closed to said nozzle outlet;
• and
• said nozzle outlet valve being biased by a second biaser toward said closed position when fluid pressure in said nozzle supply passage between said nozzle supply valve and said nozzle outlet valve is below a second predetermined pressure, which is lower than said first predetermined pressure.