Fitting

[40fordpu]

Can anyone tell me why a fitting with ferrules is used in the fuel line but a double flare compression type fitting is used in the brake system? Can they be interchanged? Thanks

[19Fordy]

I used standard 1/4 inch steel brake line for fuel line and it has worked great for the last 30 years.

[paul2748]

Originally Posted by 40fordpu

Can anyone tell me why a fitting with ferrules is used in the fuel line but a double flare compression type fitting is used in the brake system? Can they be interchanged? Thanks

I think they use the inverted flare fitting on brakes because of the high pressure in the brake system. Older fuel systems work at a much lower pressure. Newer systems (fuel injection) work at a higher pressure - not sure what these systems use.

You can use inverted flares in a fuel system. In fact, in my modified cars I do just that. You should not use ferrule/compression fittings in a brake system for the reason noted above.

[G.M.]

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The gas tank, fuel pump, carb and flex hose are all made to be used with ferrules. The inverted flare fittings on the brakes will not seat and seal in a ferrule fitting even if the threads matched which they don't. You could use adaptors on the above mentioned parts to inverted flare but that wouldn't make sense. G.M.