Ford 8N tractor fuel problem shown at sediment bowl

Описание: Ford 8N tractor suddenly refused to run longer than 30-90 seconds. I suspect I'll need to remove and flush/repair the tank properly, since the following steps made no difference.

Removing gas cap from tank (in case of plugged vent causing vacuum).
Cleaning the shutoff-valve/sediment-bowl.
15 successive attempts of dumping gasoline quickly into the tank to flush debris out of the bottom.
20 more successive flushing attempts.
Replacing the shutoff-valve/sediment-bowl.

Notice the air-breathing sound as the flow of fuel changes.

See what happened at the fuel-line/carburetor:
   • Ford 8N tractor fuel problem shown at carb...