Not real enthused with the braided line from front to back idea, but if you must, make sure it's not a rubber lined hose. Todays **** gas attacks that stuff in no time. I'd do it in hard line, keep the flex stuff to a minimum. Or how about the nylon line like is used in new cars? Have a kit for that in the classifieds.
Jim
As this man said. You need 30R9 rated hose to put up with today's fuel. This type of hose will not permeate fuel vapor or turn to mush. If you run lead based race gas use the cheap ****.
As far as the fuel side of things go:
With aluminum line you want to single flare not double flare for AN tube nut and sleeve. I only double flare aluminum when one side is not supported such as pick up tubes or in tank returns. Also you want to start the line with your flare tool of choice and finish it off with the AN fitting using plenty of lube. I use sewing machine oil when I do this. It does not matter if it is 45 or 37 tool as the AN fitting will finish the flare, this only applies to aluminum. With aluminum, if you finish the flare with the tool it will over flare the soft line and you will not be able to get the tube nut past the flare. Once you cinch the AN fitting Don't be alarmed if the tube nut does not slide off the flare and back down the line. just leave it were it wants to be so you don't **** up the flare. The flare will fill the conical area and the tube nut threads will catch the flare preventing the nut from sliding back.
Check out summit racing premium hose for best deals. It has the 30R9 rating and if you need more info go to parker hose and see what they say about it. Another very expensive and not as flexible option is PTFE hose but if you get the right rubber hose PTFE will not be needed. PTFE has it's own devils with static build up and what not. You should use PTFE for hydraulic lines and if you insist on it for fuel you need carbon imprgnated PTFE so you can ground the hose to the brided steel and fittings to avoid static discharge and pin holing your teflon hose. If you are going to run E85 I would do PTFE. I can vouch for the summit premium hose, it is awesome.
Also if you use 3/8 line you will use 6AN hose and fittings for soft connections. no point in going bigger since your line will be the restriction at 3/8. larger braided hose will be more expensive.
Everything I have told you is from directly speaking with hose and fitting manufacture recommendations that have not failed me. There are lots of myths floating around about all this stuff. For your safety talk to a manufacture if you have questions.
Make sure you double flare for brake lines or inverted bubble flare where needed. Some times on proportioning valves or odd ball master cylinders like fox mustangs. Also use seamless steel or stainless, no aluminum for brake lines. PM me if you have any questions.
