You will need to have someone get under the truck, on the side with the gas tank filler
They should see TWO metal tubes, a larger one to put the gas in and a smaller one to let the air out while gas goes in.
Have them run their hand down both tubes and feel the Rubber hoses that connect them to the tank.
Very odd for one to kink out of the blue?????
I assume no work has been done on gas tank or bed recently.
Could be vent hose has collapsed, gas tank has negative pressure in it when driving, EVAP system.