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I think it was the rusting water separator filter bracket. While the outside looked fair, the inside was rusty. The tech did say the crud is brownish.

Prior to running this year I replaced the filter with the OEM Yamaha 10 micron mini. It is similar to the standard filters but the filter cartridge is a bit narrower and deeper. It is rated up to 120 hp. I also replaced 1/2 the fuel line. The other 1/2 will get done soon.

In addition to the fuel filter before the low pressure fuel pump, I learned there are two additional filters, one inline between the low pressure fuel pump and the VST and a second one in the VST itself. The VST is a bear to check since it is behind the fuel rail and the intake assembly. Accessing that one requires disassembly of the fuel rail, intake assembly and numerous hoses/connections.

When I pick up the boat (next Friday?), I will discuss his findings in depth with the mechanic to ensure I understand the precautions I need to take to prevent this happening again.