These types of engine enamels are usually quite good with their fuel resistance, provided they have cured correctly. They will be very sensitive to fuel otherwise. I'm not sure on the correct procedure for curing this particular brand but some will require you to heat the paint to a certain temperature several times, others may have a period of 7 days or more that you need to let it sit before it is exposed to any fuels etc. Bear in mind that the waiting period can extend significantly if you've applied several coats or heavy coats.
As most of us don't have access to a suitable oven for curing, I would suggest leaving it for a week or so after painting and then sticking it out in the sun a few times on some warm days. You can also utilise the heat generated through engine operation but be careful that you don't let the engine get too hot on the first couple of times that you run it after painting. For example run the engine for say 60 seconds and let it cool for the first few times, then run the engine for a little longer each time until cured.
I have used all of the popular brands of aerosol engine enamels over the years for various jobs and have not experienced any issues once the paint has sufficiently cured.
