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Hi being a Saturday most of us are off.
If you get water in the tank you need to pump the tank out. At the shop we have a dedicated 12 volt pump. We remove the fuel sender, 5 screws, and then can drain the tank. The fuel pick up is actually a little above the bottom of the tank so you can't get all the water out using the fuel lines.
I also wouldn't recommend HEET or any other alcohol based additive. It messes with the fuel and if ethanol fuel makes it even worse.
I would also highly recommend installing an external water separating fuel filter. In your case get a RACOR filter with a Vis-a-bowl. THis is a clear plastic bowl with a drain cock on the bottom that attaches to the filter. You can actually see the fuel in the filter and drain any water. This gets rid of the water before it gets to the engine and allows you to drain it, saving dollars on replacement filters. You will need to replace filters periodically.
Sorry for the delay.
There is a drain on the bottom of the vapor separator. You need to open it and using the primer bulb push fuel through the system until you get only good new fuel. Then close the drain and refill the separator.
When you turn the key to ON, do you hear the fuel pump run? The fuel pump is prone to damage from water. It can internally rust or stick. I would run some Mercury Quickleen or Yamaha Ring Free in the fuel for at least a tank full to help clean the system.
Your pictures look like possibly water in the fuel. Any separation would be water. The small filters I would just replace.
Since you are unable to totally drain the tank or pump it out I would not try running the engine until you install the Racor filter.
When you drain the separator, drain into some paper towels and then dispose of properly.
Let me know if you have any problems.