See the pdf attachments for location and instructions. Got them from post number 20 at the link below. It's on the left side frame. You'll need a disconnect tool to disengage the fuel line lock from the filter. Some people can manage to disconnect the fule lines with a screwdriver, but you run the risk of damaging the internal locking mechanism, then your fuel line won't stay on. I have a set of disconnect tools if you need to borrow them.
Tech Links with index - Page 2 - Ford Mustang Forums