Pull out the pump relay and poke a wire in from 30 to 87, you shouldn't need the key on for that.
Make sure the petcock is opening, the pump will struggle if it has to suck through a non working petcock
If you refer to the schematic I attached earlier you will see the jumper will power the pump directly.
If you substitute a 10 Amp meter for the jumper it should draw about 4 Amps if it's spinning freely but significantly higher if the petcock is closed or the filter clogged.
Don't leave the power on if it doesn't spin, it may be gummed up.
Some people report freeing up the pump by squirting carb cleaner into it.
Once you get it to spin it can be left on for a while pumping fuel through the filter and pressure relief valve to circulate back to the pump. It runs 24/7 normally.
Another fault you may get is the commutator covered in varnish insulating the brushes, I have seen that before with a bike sitting for years, there's not a lot you can do but spray in carb cleaner and perhaps a thump on the bench with power on, if you can get it to motor at all it will soon flush itself.
If it's just plain jambed you might try alternating the battery leads to rock it back and forth, let it soak for a couple of days in carb cleaner.
Here's what you are dealing with.