Use of copper tubing?

[Johnny]

Charles 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.

How about 5052-O ? You can bend it real tight. 

-j-