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There is a boat junk yard at Reed Ave in Quincy ma. They are closed for the winter

You said that you lost fuel pressure after a time. There is a fuel pres regulator in the cool fuel as well as up top of engine. The rubber internal diaphragm could be leaking fuel back to the tank.

There are two elect. Relays on top of the engine. One is for the ecm, and the other is for the fuel pump. Get it from Merc dealer and try that.

There is a boat junk yard at the foot of the fore river bridge in Quincy.

Please do this to trouble shoot. With a volt meter .put ground lead onto the neg post of the battery that operates the fuel gauge with the problem. Place the positive lead onto the tank. Have some one start that engine. If positive voltage is found on the volt meter there is a positive 12volt...

I think the noise you hear at idle is the engine trying to catching up with the transmission. To test is to raise the idle 50 rpm and the noise will go away. Mine does that too. Many threads on this at the Cruisers Yachts forum