No, this kit will rebuild the carburetor. If you are looking for a fuel pump rebuild kit, you will want to look here:
Will this kit fit my 2002 Mercury 25 HPEL Model # 1-025312ZN, Serial # OT515520?
This kit matches up with all of your engine information, so it could work just fine. Simultaneously, if you would like to look at some other options that work specifically for your 25 horsepower motor and not a range of Mercury engines, click on this link: http://www.iboats.com/mall/partfinder/?cart_id=762874771&gd_get_grid=1&gd_grid_id=923&gd_poid=112207&gd_row=28&gd_search_7873=25&gd_search_7880=2002&session_id=372759415