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Here's a pic of what you're looking for from under the truck.

Maybe they're easily accessed with a lift or a long needle nosed pliers but otherwise they were a pain in the hind parts to get out. 😉

Not easy to tell from this drawing but I believe so. The check valves are on the passenger side in the rear of the truck on the fuel lines attached to the body of the truck above the frame rails. See encircled area.

40x15.5r20

These are the check valves once they are removed. They are NOT fun to get out but it is doable.

The issue is most likely your check valves at the rear passenger side of the truck. They are 2 brass fittings in the fuel lines. Your problem is identical to what I was experiencing. Delete the check valves and run a hose between both sides where the valve used to live. Use the existing clamps...