I have 1/2" push lock hose on my car from regulator to carb and it works great (1/2" hard line from cell to regulator). It is a bit of a pain to "push" the fittings into the hose, but after the trial and error approach, I found that putting the end of the hose in boiling water for 15-30 seconds then jamming it on the fitting worked best.
My car is on e85 if that helps.
67 Barracuda street car, 408, e85, 1.38 60', 6.44 @105.9 in the 1/8 mile, 10.19 @130.5 in the 1/4...so far....
