Got a Rochester 2 barrel on a '68 Brand X I've had stored for a while. Car ran fine when I parked it. Went to roll it out and couldn't get any fuel into the float bowl....needle and seat not letting fuel in.

Pulled it apart, cleaned the needle and seat (they looked OK), checked the operation on the bench by blowing in the fuel inlet line and it seemed good. Put it back on the car, no start. Needle and seat stuck again. Blew a little compressed air in the fuel inlet line, re-hooked up the fuel line and it ran for maybe a a minute. Then no fuel to the bowl again. No problem with fuel pressure.

Anybody seen this before? The needle and seat and all of the carb internals look pretty good, not gummy.