Thermoquad low-speed fuel well not filling?

I have used 87E10 in my TQ for decades with no problems whatsoever.
When the main well leaks, it fills the cavity beneath it, so nothing in the bowl is affected.
That cavity has a full perimeter gasket, so you can drive your car for years and not even know you have a problem, besides a slightly weepy gasket.. Theoretically it is possible for the gas in that cavity to drip into the plenum causing problems. When you take yours apart, look for evidence of fuel in the cavity, and in the plenum. If you find it, then you know. But just because you do find it, does not mean it is or was the ONLY source of your problems. Smoke may be a precursor to fire, but sometimes smoke is just smoke.