tim, i took that little filter out some time ago it got so clogged from a rust issue i had in my old fuel tank.
Well there you go. I would bet that your filter sock in the tank is plugged, and/or the filter is plugged.
One way to TEST this theory is to put a new filter on it, stick a piece of hose over the line from the tank and BLOW AIR into the gas tank. That should clear crap off the pickup sock for a little while. If that "fixes" it you really ought to drop the tank and clear it out before it become so rusted you can't repair it.
Most factory service manuals will spec how much gas the pump will deliver in a minute of cranking. Hose into a coffee can and measure! Nothing like numbers...