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Here is how I would attack the problem.
Remove incoming fuel line from high pressure/injector pump. Attach a hose to a nipple, attach long nosed funnel to another end of hose. (Any hose will do the job, as long it is close in diameter)
Make sure the hose and funnel is clean. Get cleanest fuel, splash it into funnel. Start the engine.
Basically you are running the engine now by-passing most of the fuel system, using gravity feed.
If engine runs fine (chances are 9 out of 10) then you have a problem with fuel supply –lift pump, dirty fuel, bad filters, air is sipping in, something stuck in there..
If engine is not running fine, then, in order of probability
b. Fuel injector
c. High pressure pump