I had similar a while back and it was poor connection to relay holder for the injectors. I had looked at all manner of things prior and really only found fault by chance . The cable at fault into the relay holder hadn't 'locked' into place so installing the relay pushed the female in the holder back making for intermittent contact.
I have at one time replaced the HP pump as it was making a hell of a racket and on its last legs but the engine still ran ok. so doubt its fuel related especially as it ran OK on its original set up.
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