Richard,
I have used Dupi-Color enamel with very good results. No problem with fuel proof issues. But, the available colors are rather limited. So I now use Dupli-Color lacquer spray which is NOT fuel proof. I shoot auto clear (PPG 3-part) over the lacquer for fuel proofing. Both methods work well for me. If color choice is not an issue for you, the enamel will work well.
Paul