I had same issue. I took of the Onan pump and put it directly in a small fuel container, and it would pump "ok" but would not pump from the tank, even if I siphoned it most of the way (side note, gas still tastes terrible). I bought a universal pump, mounted it to the frame beside the generator and it worked perfect. Also, note, I had some pinched spots in the fuel line that I rerouted jst for future proofing. Not sure why someone would mount a fuel line on a sharp pinched edge, when it could go over the top no problem.
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