[silentpoet]

I was looking at Oreilly's and Autozone earlier today for flaring tools. I need to do some work on fuel lines for my caddy. Basically I need to clean up on or two ends and replace the nuts. I have nuts from a new fuel line. But the factory line is bent much better, so I would rather use it.

So what is the advantage of a double flaring tool over a single flaring tool? It is not something I am likely to need all that often. So if the cheaper one works almost as well I would probably go that route.

[johnsongrass1]

Double flares are better because the sealing surface stays more consistent through the various environmental and pressure cycles.

[alkey]

you must double flare 45 degree steel tubing.you can single flare 37 degree tubing as used on an fittings.

[poncho62]

Double flares are for brake lines....Fuel lines dont need double flares.

[cobalt327]

Originally Posted by silentpoet

I was looking at Oreilly's and Autozone earlier today for flaring tools. I need to do some work on fuel lines for my caddy. Basically I need to clean up on or two ends and replace the nuts. I have nuts from a new fuel line. But the factory line is bent much better, so I would rather use it.

So what is the advantage of a double flaring tool over a single flaring tool? It is not something I am likely to need all that often. So if the cheaper one works almost as well I would probably go that route.

I always double flare for inverted flare fittings. Always. There's just no good reason not to IMO. If there wasn't a good reason to do it that way, the factory wouldn't. But they do. Stronger, less likely to leak, better able to withstand repeated dis- and re-assembly.

Edit- That's not to say there aren't other ways to do it- the factory now uses bubble 'flares', etc.

[rsfyj]

all brake lines were double flared, they were stronger and did not leak after a week of using the brakes double flare gives the nut more beef to seat on. A single flare gets burred up with the nut tightening and the more you loosen and tighten them the more likely to leak from wear. been there and done that, I had my share of leaks until i learned the double flare trick

[Centerline]

The only time you do a single flare is when you're using stainless steel lines and then the flare is 37 degrees. Steel brake lines are always double flared at 45 degrees and if your fuel lines use an inverted flare fitting you need to double flare those as well.

Centerline

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[alkey]

most times when you single flare steel tubing at 45 deg it splits.