وجود ذرات در شیر کنترل فشار سوخت

Particulate lodged in the pressure control valve, holding it off its seat or restricting its travel. The valve regulates rail pressure by bleeding fuel away, so debris in it means pressure that cannot be controlled.

Held open, pressure will not build; partly obstructed, it hunts rather than settling. The circuit tests perfectly throughout, which is what sends the diagnosis to the pump. Where the debris came from is the important half. A disintegrating filter, a corroded tank, or a failing high pressure pump shedding metal all end up here — and a valve cleaned or replaced without finding the source meets the same debris. Inspect the filter and the fuel itself, because metal in this valve usually means the pump is already failing.