Neighbor has a new to him 2000 Valk with extended fuel tank and sometimes it will just shut off. After it shuts off when you first try to restart it want start let it sit of a couple of minutes and it fires right off. Dont know if the fuel pump is still running when it shuts off but will check next time it does it. Anyone have any ideas bike has a new battery
Are you talking about a belly tank when you say extended?
If not, the Valkrie does NOT have a fuel pump.
Sounds like you are loosing vacuum.
Replace some hoses under there especially if they are very old.
They rot and crack real easy.