I went thru that with my 6.2's, my engines were running ok, but on the exhaust cycle I was dumping fuel into my exhaust system, it took me 2 years to figure out the the paint inside the fuel cooling system was peeling off clogging my fuel pressure regulator, I opened them up cleaned and sanded the paint off,replaced the fuel pressure regulator that was clogged, this solved my problem, I also did the same with my other motor to prevent this issue from happening to it. I hope this helps you with your issue. my boat got so much better on fuel efficiency after the repair.
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