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Fuse to ECU blows (grpN )

  172 cup , 197 cup
My 172 Cup with grp N K-Tec chip Has now blown to the 30 amp fuse located under the cover right of battery that controls the fuel pump several times .It has only happened on track days ( engine cuts out completely ) when reving in excess of 7k .I had a reflash at Renault garage and they could not pin down why it was doing it , but it did it again .Anyone else had this problem or have any ideas .