Fuel line through firewalls
Ok . . .I'm suprised no one has offered this up . . .so I will. I have been using rubber grommets. I drill the hole for the right size grommet then push it in. works great, looks professional, and solves the problem of chafing the fuel lines. I have purchased them from several sources including TNT landing gear, radio shack, and home centers. The TNT variation seem to be just the right thickness for most fierwalls. I even get some that are thinner for running wires etc through bulkheads.
Take it with a grain of salt, but I am Anal, and these things make the installation just perfect.
PBH