steel fuel line buzz Options

[eyesright]

A coupe of years ago I replaced the original fuel lines with steel brake lines. It is a '72 with original FI and fuel pump relocated to the front by PO. I used a right angle fitting at the firewall rather than bend the line. On driving, the fuel lines buzz with a harmonic at all speeds that isn't nearly as prominent when not moving. I have covered the exposed lines with old rubber lines and secured them pretty well but no effect on a still noticeable buzz.

I am replacing the fuel lines now in a '76 and have steel lines long enough to bend.

If the harmonic buzz in the '72 is from cavitation at the right angle joint when there is significant fuel flow, then this should not occur with the '76. (I recognize that there is fuel circulation even at idle, but I don't get near as much harmonic buzz at idle. And it'a a much higher buzz than I would expect from road vibration.)

In the future I'll really tie those suckers down in the engine bay and where ever I can reach in the tunnel in the '72 to see if that helps or replace them with longer ones like the '76 if that is successful.

Has anyone had this problem or any ideas to offer?

[Bob L.]

I just replaced my old fuel lines with SS as well. I don't have the car running yet, so no noises for me, but there are metal clips that hold the old lines in the tunnel. It was a bit of a pain to get the new ones in the clips, but it may hold them more securely and prevent vibrations from rattling the lines. also check the grommets where the lines enter/exit the tunnel.