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Thanks for the thoughts. The hand pump is just something I added after the problem started happening, it helped to verify fuel pressure was actually low and it also helps me run the engine to get the boat back to the dock. Collapsed line is interesting. The only line it could be is the one line...
Looking for suggestions: 1999 Mercruiser 5.0 with TBI EFI
Boat was running great until very recently when after 10 or so minutes of running the low fuel pressure beeper will alarm and then engine runs rough and/or dies.
Since this problem started I have:
replaced the fuel filter/separator...
