You seem to have all the right ideas, but is the vent hole in the fuel tank filler cap blocked?
It sounds like you are trying to suck against a vacuum . . .
Maybe, as you suspect, the suction pipe is blocked - you could fix some clear plastic tubing and see how easily you can suck fuel (stop when it reaches the clear tubing!).
I think that the plastic cylinder is the float for the gauge.
I'll check my manual and see what else I can find.
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