All, I was out for the last few days on the water and while under anchor in a cove for a few hours in the HOT (over 90 degrees F) Georgia sun as we were getting ready to leave, my Starboard engine started, but would not stay running. Before I could put her in gear, she would stop. After I pushed forward with only the port engine for about a 1/4 mile, I tried it again and the starboard engine started and stayed running and we went onto the next destination - fireworks show. We docked for about 6 hours with the Kohler Gen running the entire time. When it was time to leave, same thing the starboard engine would not stay running. This time I tried diverting the Starbard engine from the aft tank to the Starboard tank and no change, so I changed the fuel back to the aft tank. After pushing off with one engine around hundreds of other boats inm the dark (yikes) we got past the no wake area (about 1/4 mile) and I pushed the port engine to 2600 rpm to limp back to our dock and then I tried starting the Starboard engine again and it started, I put it in gear and ran back to the dock under full power at 3600 RPM with both engines. This was about a 27ish minute run at 3600 rpms. I then docked in and out of gear no issues.

Info:

Mercruiser 7.4L MPI MIE V-8 gasoline naturally aspirated engine - 330hp SN- 0L303931 & 34
Velvet Drive Transmissions, Model 20-01-005 direct drive - 2.455:1 ratio

Other Info:

Both Engines were drawing from aft tank
Aft tank 7/8 full
Gen running on Port tank 3/4 full
Starboard tank not being used and is 1/2+ full
On 6/16 Took on 135 gallons of fuel between all three tanks

Aft 53 gallons of 145 gallons
Port 39 gallons of 99 gallons
Starboard 43 gallons of 99 gallons

Maintenance:

Fuel filters were changed about 20 hours ago (also did impellers/ Oil change / Fluids check)

I found one other thread in the forum, but it does not really apply to this issue which is why I started a new topic. Hope everyone had a great Independence Day weekend in America.

As always, thanks for any and all input.