Here's some thoughts
That fuel pump has a nifty hand prime lever on the bottom that allows you to manually pump gas to the carbs!! You might want to disconnect the fuel line upstream of the pump and try pumping by hand to make sure you've got fuel as far as the pump.
Also, in the case of a potentially clogged fuel line, it's generally a better idea to blow from the front of the fuel line back into the tank. Blowing crud forward from a large container into a smaller line and then the pump, float bowls and jets is bad. Especially in the absence of filters. Got any?
Have you been into the float bowls at all? Those can nasty up fierce especially if water/moisture spent enough time in there. I've seen those brass floats frozen up with rust and oxidation. Getting it only to run on starting fluid is a good indication that it's fuel starved - I'd start at the float bowls and work back from there.
If there's crud in your tank, although you may get it running, you may soon find, somewhere down the road, that it dies for no reason, and so you might remove your tank and clean it out.
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