I had a work truck like that. You had to hold the pump handle upside down in the 10 or 2 o’clock position then squeeze the lever about halfway to fill the tank. It held 28 gallons and took forever to fill when it was empty.I heard that on the radio yesterday.
I have been to Oregon a few times and it is odd that I was not allowed to pump my own gas.
My Dodge truck you must trickle the fuel into it as the tank is a bit up hill.