Date: 27 Jul 2001
Actually, according to the manual, it should be a 25A fuse for the fuel pump as fuse #2 on the aux fuse board.
However, it has been mentioned previously (obviously I should add it to the FAQ!) that if you have a 924 fuel pump relay instead of a 931 fuel pump relay in there (easy to swap the wrong one in, and the right one is expensive, so it's financially motivating too) the relay itself will keep blowing.
Since you've mentioned that the relay itself is blowing, bite the bullet and make sure you're buying the correct one.
The Porsche part # is 931 615 113 00, I just replaced mine and it says right on it very clearly that it's rated for 16A, and has a # 896481 on the top for the manufacturer's part #.