you have a regulator already. the question is do you need an adjustable one. id say no, you dont NEED one but if you want to do any type of tuning to it, you will need one with a gauge. Kirban is a great one and are usually a lot cheaper then say BBK
Since you only got a 110 its probably safe to say you are rolling stock or close to it. So to answer your question, you can get by with the stock fuel system like the others have said.