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I was thinking of using it as it would be easier to form. I ran the 3/8 line that's there now and it was a bear to bend. I'm probably going to show my ignorance here, but what is the "softer steel" and where do you get it? Can it be formed easier than the brake line steel lines?
Thanks again!

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Auto parts store sell it in 25' coils. I recently bought a roll of 3/16 for brake line replacement on a pickup truck. 3/16 I could bend by hand easy enough, 3/8" your gonna need a tubing bender to do it decent. It's not as hard as it appears in your mind, once you do it, it feels great!
The reason everyone wants to say aluminum is fine is because there afraid to try to bend steel, don't be scared!!

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If your aluminum is cracking, you are using the wrong aluminum or its installed wrong. You DO NOT double flare aluminum, you need specific radius bends for each specific line, Aircraft vibrate much more than most race cars, they have been using it for decades and no issues when done correctly. Tim

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I'd never use aluminum; only advantages are weight and ease of forming and the weight is negligeable and mild steel isn't hard to form. disadvantages are aluminum is brittle and prone to stress cracks.....not something I'd want for a fuel line. Steel or SS



Dave

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Exactly.
With todays gas, there will be problems with aluminum lines sooner than later too.
For a street car it's much more dangerous than a race car.

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I am not sure it correct to compare an airplane to a car. No fuel corrosion issues, not sure hitting a pot hole/curb is the same as being buffeted, little road debris at 5,000 ft, most lines in a plane are enclosed, and weight is a bigger issue aloft, routine inspections are required in aircraft but cars are more install and worry about when there is problem, and not much reason to worry about a fender bender in the air. However the concept of properly installing a fuel line likely is valid for both.

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Yep, apples and oranges; there is a good reason to use aluminum in an airplane, but not on a street car which is subjected to far more abuse and virtually never inspected.

Dave