77 K35 driving me nuts, no fuel to carb

[Redcap]

A few days ago, I dropped the tank out and bypassed the selector valve, replaced fuel lines as well since they were all dry-rotted badly. Now I cannot get fuel to the carb. Replaced the pump and blew back through the soft lines with the compressor, I could hear air hitting the tank through both the supply line and the return line. Hooked everything back up and still no fuel to carb. It is making me crazy, none of it makes sense. I've been messing around with it for 8 or 9 hours today and still no progress, cranked it until the battery pulled down too far.