Use these, I got mine from Summit.
"Fitting, -6 AN Female to 3/8 in. Tube, Aluminum, Red/Blue, Each
A little tip is to put some gasket maker (just a very small dab) on the outside end of the tub and this will almost ensure a perfect seal. You can use the same stuff you used for the gas tank assembly. Otherwise I found these tend to leak a bit with out it (3 of my 4 did without the little dab). Overall, much easier than a flaring tool and fittings.
http://store.summitracing.com/partde...=RUS%2D639200& amp;N=700+115&autoview=sku
The right fittings for the job.
Looking for the right adapters to use with aluminum fuel line? Then look no further than these adapters from Russell. Designed to connect aluminum tubing to -6 or -8 AN adapters, their unique crimp design eliminates the need to flare the tube, thus saving you precious time. They're available with both male and female ends for 3/8 in. or 1/2 in. diameter tubing. "