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Let me say, I really appreciate all of your advice and support with this.

Today I drained the fuel system and ran the engine on portable tank with clean gas. No joy. Have reviewed fittings, filter for any leaks.

I posted my symptoms on the Yamaha forum of I-Boats and Rodbolt (a Yamaha Master mechanic) suggests the cause is "..most likly gonna be a clogged filter on the high pressure pump or the injector screens are clogged"

I looked at the old water separator filter and bracket that I just replaced. I see lots of rust and crud on the inside of the bracket and ports. I think this may be the source of my problem.

In the shop she goes. Guess I know where my tax "rebate" check is going. Will post results.