It's not likely that one of the high pressure fuel lines got clogged. Fuel goes through one or two filters before getting there, a very sensitive pump and the pressure is really, really high. Lower fuel flow on that one line could indicate there is still air in the system working its way out. Is that particular line kinked/damaged?
I had an universal XP-25 on a previous boat and I don't remember having to crack injector lines to bleed the system. Matter of fact, there were some who advocated leaving one of the bleeder knobs openned all the time, so it was a self bleeding system.
1983 Fraser 41
La Conner, WA
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Boating for over 25 years, some of them successfully.