Is anybody running aluminum tubing in the fuel system after the EFI pumps?  I am replacing the small filters with a large canister filter and I don’t have much room,  it appears that it would be easier to route some al tubing than try and get flex Aeroquip hose in there.  I would have two sections of tubing about a foot long if I used that system.

Yes – and why not? I have only short lengths between pumps and filter mounted on the firewall.  The only concern is vibration of the line that might lead to work hardening/fatigue; so line supported to structural members are fine.  Don’t use where one end is fastened to something subject to vibration; like anything near one of those Lycomings.

Al