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Hi Frederik This may have to go to a garage to be fixed.
From your description it sounds as though certain checks need to be carried out which I would only advise a qualified person to do. The reason for my advise is your dealing with a highly inflammable fuel running under pressure,
They would first check to ensure fuel is delivered at the injector and then confirm the fuel quality i.e. no contamination such as water. By your description it starts and runs if you put a fuel into the intake. This confirms that fuel is the issue or lack of. The other possible would be fuel pump fuse - relay or pump in that order. There is one other area I would check " air intake", where are you adding fuel to intake? Is it before intake box or after, if after intake box check the intake from the chassis area where the air first enters all the way through make sure nothing is blocked.
Leave air filter out and try if no different put air filter back.
When did fault first occur had you refilled with fuel shortly before? if so possible contamination could be the problem. Good luck
check for air in the system . Bleed out at all bleed screws . crack the injector lines at the injectors and continue cranking until diesel drips from the nut. tighten and continue cranking. Check for fast crank speed and glo-plug operation
My girlfriend did this to my super duty ford. It's a pain, drop the tank, dispose of fuel, remove fuel lines at injectors or rail or filter, blow lines out towards removed tank with compressed air (not to high of psi) reinstall tank & lines, prime system with good fuel. Start truck. Maybe run some fuel treatment for a tank or two. Good luck.
Try a fuel line/injector cleaner it may be blockage in the fuel lines or injectors or if you are in an area where rust is a problem may also be a bit of git clogging fuel flow from pump
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