Hai,
For the fuel-line:
At
www.louis.nl you can buy a "fast-coupler" for fuel-line's It's a coupling device with a build in shut-off valve, so when you disconnect the fuel-line, no fuel will leak out.
For the air-filter:
The paper-filter is no good in the desert. It will fill up with sand and no air can get through any-more.
There are two sorts of altenative's: A foam filter or a K&N cotton filter. Both are oiled.
I don't know witch is best. Some say the foam (I don't know any brand, but at a dirt-bike shop you should be able to get one), others say the K&N is much better.
I have a K&N filter. (
www.louis.nl) It's expensive, but lasts 1.000.000 (!) miles. Cleaning and oiling every 50.000 mile's under normal conditions.
I guess in the desert aspecially sand-build-up inside the air-filter box is the main concern. That's why there are "pre"-air filters. (K&N make's them also) They have wide openings, so they only filter sand and other big stuff.
Cleaning out the airfilter-box every evening is still a good idea.
Hope this helps.
Maarten