Remove and Inspect Fuel Shut-off Valve

What happens here

With most of the fuel drained, the owner uses an adjustable wrench to loosen the existing fuel line from the fuel shut-off valve. Then, he employs locking pliers (channel locks) to get a firm grip on the valve itself and unscrew it from the bottom of the fuel tank. Upon successful removal, the valve is inspected closely, revealing a complete blockage inside from a black, gummy substance referred to as 'goober', confirming the source of the fuel restriction.

Goal: Access and identify the blockage in the fuel valve