The engine of my Ssangyong Kyron 2.7 diesel has stopped and will not restart. I've checked all the fuel lines from tank to the injector pump and fuel is getting through. The primer pump presses hard against the injector pump, but no fuel is getting through to the common rail on cranking. The pump must have a mechanical/solenoid shut-off valve to stop the engine, but is this valve serviceable? How can I check it? Willi Baumeister Unlike the older diesel system, the common rail does not employ a fuel cut-off to the high-pressure pump. This isn't needed because the vehicle can be stopped by cutting the injectors to prevent fuel being injected. The problem you have may be a faulty high-pressure pump or the pressure regulator valve that should allow regulated leaks back to the fuel tank.
Caution needs to be taken when working on the high-pressure side of the system and the pipes should not be removed. The fuel on the high-pressure side runs at pressures up to 2000 Bar. The high-pressure pump does have a regulator valve, but failure of this will not normally prevent the engine starting.
It would be advisable to read the system for any fault codes that may be stored before attempting any repairs on the injection system.
I am assuming you are using a standard diesel and not a bio-diesel mix, as fuel system failures due to fuel impurities have forced Ssangyong to take the unprecedented step of discouraging any use of bio-diesel in its vehicle range.