Rewiring a 190 with 4 gage wire

[mnturbo]

Hey DSMers I got a quick question.
I am going to install a 190 fuel pump in my car soon and I want to rewire it.
The question is I have a really thick wire running from the battery to the trunk from a previous owner who had a amp back there. I think the wire is like 4 Gage it's pretty heavy duty!!
Would there be any problems with using this wire for my fuel pump. I don't want to wreck anything.