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Well, first of all your not going to run 10-20 sec on starter fluid. You would expect a couple of cylinders firing indicating "spark". so I think your close to resolving your problem.
Relative to tank cleaning I went thru this whole thought process about 5yrs ago. I have a 1966 Morgan 34 with original engine and monel tank with direct fill from the cockpit. Had some running problems and used a bright inspection light into the tank and was surprised by amount of black gunk on bottom. I had changed a worn black rubber pick up tube years ago with a fixed cooper one which I think added to the problem especially with ethanol marine gas. to "clean" the tank I jury rigged a cheap electric [$20] fuel pump on a board with extended wires and clamps to one of the batteries. I used inexpensive clear plastic gas resistant hoses for inlet and outlet along with $10 glass filter [little white disposable elements are 40 microns]. I moved the inlet hose around thru the fill whole as best I could and even tied to a stiffer old garden hose to maneuver it around even more. I clogged cleaned & changed elements in the filter multiple times and flushed the tank with the old gas a few times and repeated. I did not want the work invoved with pulling the tank nor did I have a cleaning service option. Worked fine ever since and regularly pump out the bottom gallon or so every season. this might help.
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