Many things have used it for fuel lines before.
But now people think it is likley to crack, and that is bad if it has gas in it and is near a hot engine.

I would use regular steel or stainless myself.

I think I have heard that it may be illegal to use copper for fuel lines in some states? like you should fail an inspection if you have copper fuel lines. I am not for sure on that though.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-