Strong Sulfur Smell

I am getting a strong sulfur smell coming from my 1990 Suburban. I am primarily getting this smell after I pull my boat. I have no idea where the smell is coming from. I had the catalatic converter replaced last year but it didn't solve the problem. Does anyone know what might create this smell?

Try filling up with a different brand of gas, the one u are using may have too much sulfur content in it.