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Would I be correct to assume that if the motor runs good at low cruising speed ----the lower fuel pump is good.
But when you throttle up and it basiclly shuts you down -----the high pressure fuel filter is probably bad.
Good fuel ----good batteries ----fuel filter new -----trying to figure out...
I've read a lot of old post so maybe someone has an answer. Just purchased boat with 140df. Ran fine for a few weeks then I noticed that I couldn't get over 4200 rpms. (Used to do 4600) Days later ---4000 if lucky. Now it tops out at about 3200 and 3000 with a few people on board.
Put new...
