If available, I'd recommend trying SprayMax 2K clear. It's the most durable and fuel-resistant spray can paint you will find. It is a 2-part catalyzed paint, and you puncture a bladder inside the can to activate.
I've used it over Duplicolor auto touch-up spray with good results. Just let the base flash, then apply the clear in a couple medium/heavy wet coats. It doesn't dull or chalk, and doesn't run very easily.
Sooner or later you will splash gas on the tank, and a regular (non-catalyzed) paint/clear is going to soften and dull - which sucks after doing all that work.
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