The fuse should be 30A not 15A, even so ideally the fans need a rewire as the standard loom was sub standard to start with and many have melted. The fuel pump wiring drgrades as well and hence you end up with less power than you should at the pump which can lead to a melted engine. There are diagrams on here on how to do, very easy to DIY as well or you can buy pre made looms. You need sutiable grade wiring, SPST relay, Fuse and fuse holder (Fan Loom).

Martin