That's what I was going to ask about. Worm gear hose clamps always catch my eye after having ripped open my skin one them enough times.
A guy in my Kokopelli group last year had an 80 with two stock Toyota fuel tanks. One was the stock 80 tank, and the second was a stock Toyota Tercel tank that he said fits perfect in the spare tire holder space. He'd set it up to have a pump, with valve & hose to "manually" transfer to the regular 80 tank or to a jerry can or to someone else's truck. Food for thought. Maybe if you're unable to find a replacement 80 tank, consider a Tercel tank. Or do both if you can

it seemed like a cool setup and for all intents/purposed used only Toyota parts.
Allen