[1966Mustang]

Took a look into the tank last night - it's about full of fuel - 50+ Gallons.

What is currently set up in there is:
Tank -- Napa F/W separator -- FuelPump Filter -- Carb Filter.

I pulled the carb filter - nothing to mention in there.

Pulled the fuel pump filter - nothing there.

Water separator didn't look like it had water in the fuel

Took a fuel sample from down the bottom of the tank into a glass jar and let it sit overnight... Nothing separated out. Not finding an obvious smoking gun yet.

I do have a napa fuel/water separator - looks like a regular filter, no drain hole. I am going to replace this with one with a drain. Parker/Racor makes one that fits the OEM mercury mount about $50.

In addition to that I am going to get small aux tank to hook up to with known good gas to do a test run. If it runs all right on there, I'll know the fuel in the tank is the issue for sure. This seems like the easiest way to troubleshoot.

If it displays it's issues again, then I'll know I need to dig deeper... plugs, wires (which are new, but wrong style end), take a look at the dizzy.