I have a T6.354 and had a problem with similar symptoms. At the time I was running on only one of the two tanks. I immediately switched to the other tank and it started right up. There was a sucking sound when I opened the valve to the other tank. I believe the inside of my fuel pickup tube is delaminating and collapsing. Back at the dock I removed the line to the suspect tank and blew air into it and it was easy - so I don't think there's a glob of gunk in the hose. It's on my list of things to replace.
Do you have dual tanks feeding both engines with a cross-over valve, or is each engine plumbed to a single tank?
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