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Howdy. I have the same issue. The new ethanol fuels scour fuel sys. and wreaks havock. I have already cleaned my injectors and replaced the internal filters. I got them at Testmasters a local injector service and sales center. I used a rolled tip on a paddle drill bit to reach into the injector and hook the filter...and pull them out. Once out, I blasted the injector w/ walmart carb cleaner, attached a injector plug to a push button switch connected to 12v and "tapped" the switch while back blasting the injector w/ air then cleaner. 12 v continuous will burn the injector so you Tap or momentary contact operate them. When a fine cleaner mist is apparent from the supply side the injector is clean. I then pushed in the new filters. Gas psi from the engine is approx. 35psi so 80 or so will look great from an air nosel.
After injector cleaning the boat ran like a champ till I got "bogging " this past weekend.
My boat is a 19 Dusky w/ a fiberglass tank and I had run several tanks of 10% ethanol gas prior to epoxy painting the inside of the tank so I am sure the problems I have are from the ethanol eating my resin. I run a large primary filter. the secondary engine filter is being replaced, and I am about to return to the bench to clean the VST filter. I got the entire air intake/VST off in 1hr while watching the news and swatting skeeters. I know several Yam Mechanic and they all say this is something I could do.
I post what I find in the VST.
This is my fist time to this board...I do own a 13!
But I hope all are aware of the ethanol and the old fiberglass Montauk tanks.
The tank on the dusky is the large square forward console seat so cutting a large hole to get in and paint w/ epoxy was a breeze. Not so w/ the Montauk tanks..sorry.
cw