Use of copper tubing?

[Sandy]

Vibration is mostly the reason, copper will fatigue much sooner then
aluminum or steel. 

At 01:58 AM 3/27/97 GMT, you wrote:
>	I have read in several books not to use copper tubing in a
>high-pressure system with changing pressures (such as brakes) because
>it will work-harden and crack.
>	I'm running Teflon-lined stainless braided hose (only .42 inch OD
>for #6) for all my high pressure lines.
>	Does anyone have a reason that I shouldn't use copper plumbing on
>the suction side of the fuel pumps? Pressure never exceeds 1.5 psi
>(blowoff valve on the tank). There's a location that I need a fairly
>tight 90 degree bend, and there isn't room to bend the existing rubber
>hose.
>	Thanks!
>-Charles
>'81 745i
>
>