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VST - Vapor Separator Tank.

There are low pressure and high pressure fuel pumps.

Was the fuel system drained last year so that you used FRESH fuel this year?

If not, you need to drain all the fuel and use fresh fuel and then test the boat to see if that is really the problem.

All fuel put in the boat should be treated with a stabilizer product that prevents phase separation.

If your boat is not used frequently, the tank (not the engine) should be drained. Use the fuel in your vehicles.