I just did mine a couple months ago and I used probably 21-22ft of 1/4" ID fuel line and I would estimate 15-20 clamps(I bought 2 packages of 10 and I have some left over).
If I had to do it again I would buy +/- 25ft of line and +/- 20 clamps ... should have more then enough with that and you wont be left with too much waste.