Quote:
Originally Posted by Graplr
To me it seems like fuel is brought to the injector through the injector lines and any unused fuel is pushed out into the return lines on both sides (following the path of least resistance which since the back is capped is towards the front). Is this correct?
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The notion of "unused" fuel is not quite accurate. The design of the injector is such that some fuel from each cycle is allowed to leak past the nozzle valve to provide lubrication. The fuel initially supplied to the injector is routed via passages in the injector wall and sides of the nozzle and does not share a path common with the return fuel. The "return" flow is not simply excess fuel that is "left over" from an injection event. It is necessary and intended leakage past the pintle.