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I have been following this post and felt most troubleshooting ideas covered. However, a while ago, a friend who takes care of Water District boats, told me of a similar issue where under load the motor starved for fuel. The fuel line was collapsing on itself. I just replaced all my fuel hoses and when shopping for hose at WestMarine they had a sunlight resistant hose (grey if I remember) that collapsed easily to the touch. I went with the black fuel hose because it felt "thicker". Good luck. I am with VA Whaler that at least contacting the Service Manager is in order and ask what they did and what you are not doing. Everything from type of hoses to how they tested. I am a little confused how a Marina would send out a boat and then have you set up the fuel system.

Worst case was another friend who had his boat with his Etec serviced and was given bill of health. Operating issues from the get go. Found out the servicing was done but the test run imaginary. A wire plug connection was neglected. You may want to jiggle wires and check connections.

Garris

Years ago an old Dodge van I had ran horrible. Brought it to an old time mechanic an told him to rebuild the carburetor. He cleaned the points for free (ran great) and told me he should have kitted the carburetor for $400 to teach me a lesson