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Old 04-02-2019, 01:38 PM
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Comments on my AN flare?

I'm not very familiar with 37 degree single flare, and it turn out my tool isn't very good.
It's a 3/8 steel hard line (not stainless) that will be connected to AN 6 fitting.

I think the flare looks narrow, but when when I slip the sleeve over it, it might not look so bad after all.
What do you think? Is it useable in a low pressure fuel system?




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Old 04-02-2019, 03:33 PM
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Second picture doesn't look bad at all.

Going against an aluminum, brass, or steel fitting??
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Old 04-02-2019, 11:16 PM
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Steel hard line against aluminum fitting.
Is that a problem?
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Old 04-03-2019, 12:02 AM
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Quote:
Originally Posted by staleg View Post
Steel hard line against aluminum fitting.
Is that a problem?
Not a problem. Steel to steel you'd be able to tighten it right up and force the flare to conform. Aluminum and brass, it will indent the nipple to make the seal....te nipple won't be able to be re-used is a likely result.
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Old 04-12-2019, 01:48 AM
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An update on this:
To be on the safe side, I changed to aluminum pipe where I need the flare. It's at each end of the system, so the pipes are well protected.
The long hard line under the car is still of steel, as this need rubber hose with clamps in both ends anyway.
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Old 06-23-2019, 05:56 AM
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Quote:
Originally Posted by ericnova72 View Post
Not a problem. Steel to steel you'd be able to tighten it right up and force the flare to conform. Aluminum and brass, it will indent the nipple to make the seal....te nipple won't be able to be re-used is a likely result.
When working with AN fittings, if you tighten it enough to force the flare to conform to the other fitting, you've pretty much ruined it. A 37* flare isn't supposed to be tightened to the point one side deforms or "conforms" to the other. It's the mating of the two surfaces that creates the seal. If one flare is off and doesn't mate perfectly, the only way to force the seal is to over tighten which ruins both. A lot of people don't realize this and WAY over tighten the fittings thinking that tighter is better....it's not...

The flare you posted didn't look bad, but the only way to tell if it's good is to mate it to the male end and see how they match up. A single 37* flare isn't difficult with a decent tool, but there are some cheap ones out there that make it a lot more difficult than it needs to be.
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Old 06-25-2019, 07:01 AM
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I ended up buying some aluminum fuel line instead, and used that on the parts of the line that needed to be flared. Much nicer flares on that.

The fuel line that's under the car is still steel. No flares on that one, because it has rubber hose parts in both ends to take up vibrations (Goodyear J30R7 hose).

Everything is tight and leak free.
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