Hi hope you don't mind me asking for help on my first post. I have a non starting 118D. 2010 N47 engine. Engine tries to start after much cranking, then seems to lock up and stop, but wont start. Originally thought the timing chain snapped as this drives the high pressure pump, but cams are turning and sounds like it has compression, so do not think it is that. Getting low fuel pressure code 4b90. Tried a new rail pressure sensor today and still the same, never that easy is it. Definitely seems like a fuel pressure problem, only about 12bar on cranking gradually rising to about 60bar then starts to fire then stops, target pressure is about 400bar. Connected air line to the disconnected fuel pressure sensor and pressure went up, so that seems to be working, but no pressure in the rail. Disconnected fuel filter and fuel flows out, but only while cranking, not just with the ignition on, not sure if this is normal as cannot hear the fuel tank pump prime when ignition switched on. About 7bar pressure out of the filter. Looking like high pressure fuel pump to me, although did not see any metal particles in the filter. Anyone any ideas before i condemn the fuel pump and injectors. Please help. Thank you
ADE H
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