I agree with all above, want to add 0. 02 more-
with repeated changes, the hex on the cheap stock plastic fuel cover
will round off and you'll end up busting your knuckles.
(ask me how I know)
At $59, the nice machined metal cap sold by Genos may sound
a bit expensive, but it's worth every penny. No more bloody knuckles.
The metal cap also offers benefit in that it doesn't have the undesirable
plastic fingers inside that retain the fuel filter element. With the metal cap,
you're free to remove the cap by itself, then remove the fuel filter element
seperately under more controlled circumstances (less or no spillage).
I found the outer edges of the replacement fuel filter elements I'm using...
don't quite fit inside the inner clearance area of the metal fuel cap-
I had to trim the outer edge of the fuel filter with tin snips to make easy
clearance. (no, not cutting the filter element, just trimming the edge
of the round plastic disc on top). But I much prefer that simple operation
over having to hassle with the original plastic cap.