<<IMHO, if you don't know what type hose to use, maybe you shouldn't be making your own.>>
Awwww, c'mon now. The list of what I didn't know when I started my Lancair was enormous. That's why I asked questions, read lots of books, talked to a zillion vendors at Oshkosh, and read the LML almost every day. Even the FAA says homebuilding is all about education!
I agree, if you don't know what type of hose to use, you shouldn't make your own until you find out! Then, knock yourself out! Although personally, I would have them professionally made *and pressure tested* rather than make my own. Not that expensive and quite possibly better results on this critical component.
My answer -- use a Teflon-lined hose that is replaced "on condition" rather than at a fixed interval such as ten years. Firesleeve them, too, at least the ones in the engine bay. And finally, only use steel fittings unless the complete line does not move. (i.e. if both ends are attached to firewall-mounted components, aluminum fittings are okay, although you should probably be using a hard line there. If the hose attaches to the engine, that moves, so use a steel line. Aluminum fittings could break in this scenario.)
- Rob Wolf