Re: 1 gallon tank and paint
If you want to bake spray paint in an oven, 150F is fine. Do not go over that by too much though.
I would leave the part in for at least 1/2 hour to 45 minuits. I have done it many times in the past with excellent results. No I did not ust the oven in my kitchen! That really is asking for health problems.
I have never tested a part for gasoline resistance, however I have read that appliance epoxy paint holds up well.