Larry Schremmer had exactly the same problem as you, tho he uses his motor a bit less, I guess.
He used an outboard gas tank and added a fuel-return line . . . soldered 1/4-inch copper tubing to a square plate and screwed/siliconed it to the tank (drilled a hole first, of course!).
If I could figure out an easy way to post a photo (I'm challenged that way) I could post a screen grab of the photo with the article . . pretty much shows everything.
Or maybe someone you know has the mag laying around?