Is this a Johnson tank? Know what model? One photo shows it next to an A35 tank. Very similar except the fill spout is forward. Isn’t there some story about them moving that spout back so that it doesn’t spill if you tilt the motor forward?
It looks Johnson-esque to me. The fuel outlet on the left side is a puzzler. Looks similar to the V-45 but yours doesn’t look big enough for that. Someone will know.