Borderless Printing

I am having problems with Borderless prints in Photoshop Elements. When I select paper size from the menu I get loads of choices but when it comes to print size I get only 5 choices all of them small and the custom setting wont let me set a larger print size, clicking expand to fit doesnt help. I always get white lines on 2 sides of the print. I use an Epson 8550. When I use Epson print software I can get Borderless prints without a problem. Does anyone have any suggestions?