Be realistic about your old truck. It’s nothing like the nice Honda CRV or modern pickup, or whatever you and your family drive every day- in terms of technology it’s closer to a lawn mower , an old lawn mower. Overfill it , get a mess.
If you fill the gas tank right to the top , into the fillet neck , you are asking for trouble. As previously stated , gasoline expands when heated. The underground tank at the gas station is cooler than summer air temperatures. Fill it up to the top , park it in the sun , the results are what you picture depicted.
Don’t challenge all those connections above the gas tank in your old truck by having standing fuel in the neck. Keep the fuel level down in the tank and you should be fine.
