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Old 04-19-2015, 06:07 PM   #1
In The Ten Ring
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Not flaring my fuel lines!

Today I grabbed a break and did some study. Rubber hose doesn't slip onto single flared lines very easily and my kit won't do bubble flares.

About a year ago a couple of members suggested I not even flare my new fuel lines and I think they might be right. I easily slipped hose onto unflared lines and clamped with hose clamps....I couldn't pull it apart.

So I don't think I'm going to flare at all. 250 I6 engine, 1 barrel carb, and mechanical fuel pump are the stats.

Your thoughts?
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Old 04-19-2015, 06:11 PM   #2
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Re: Not flaring my fuel lines!

I have a cheap $50 double flare kit from a parts store. When I did my fuel lines I used the flat side and flared the tube. It creates a small "bump" on the line which allows a clamp to be secure and the hose not to slip off.
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Old 04-19-2015, 07:54 PM   #3
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Re: Not flaring my fuel lines!

You know you don't have to do a complete flair. You can just slightly flair that line enough to create a wide spot to create some hold where if the hose clamp did get loose the pressure couldn't push the hose off the line. Or pickup the OE correct line and eliminate that possible fire hazard.
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Old 04-19-2015, 08:22 PM   #4
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Re: Not flaring my fuel lines!

There's no pressure anyway. The pump is pulling fuel from the tank. Different story when the pump is inside the tank.
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Old 04-19-2015, 08:43 PM   #5
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Re: Not flaring my fuel lines!

Quote:
Originally Posted by EARNHARDT#3 View Post
There's no pressure anyway. The pump is pulling fuel from the tank. Different story when the pump is inside the tank.
Mechanical pump to carb is 5-6psi of pressure.. Which isn't much but on a unsecured hose it could pop it off.
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Old 04-19-2015, 09:09 PM   #6
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Re: Not flaring my fuel lines!

I was going to use a couple of hose clamps (screw kind) on either end. Would that secure it enough?
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Old 04-19-2015, 09:24 PM   #7
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Re: Not flaring my fuel lines!

Quote:
Originally Posted by In The Ten Ring View Post
I was going to use a couple of hose clamps (screw kind) on either end. Would that secure it enough?
When it comes to fuel I take no chances.. Watch this video.

https://youtu.be/KaO2jAWqVU0?t=2m22s
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Old 04-19-2015, 09:34 PM   #8
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Re: Not flaring my fuel lines!

Quote:
Originally Posted by enaberif View Post
Mechanical pump to carb is 5-6psi of pressure.. Which isn't much but on a unsecured hose it could pop it off.
From the pump to the carb should be a steel line with fittings at either end. Rubber hoses would be at either end of the line from the tank to the pump.
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Old 04-19-2015, 10:18 PM   #9
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Re: Not flaring my fuel lines!

Like this homemade beauty! Not really, its ugly and my first attempt at bending lines and flaring, but no leaks!
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Old 04-19-2015, 10:42 PM   #10
enaberif
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Re: Not flaring my fuel lines!

Quote:
Originally Posted by EARNHARDT#3 View Post
From the pump to the carb should be a steel line with fittings at either end. Rubber hoses would be at either end of the line from the tank to the pump.
I'm currently running rubber between pump to carb because my metal line broke and finding a replacement is not easy. It works and when I have time I'll redo it properly with a nice metal line.
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Old 04-20-2015, 06:53 AM   #11
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Re: Not flaring my fuel lines!

Quote:
Originally Posted by enaberif View Post
I'm currently running rubber between pump to carb because my metal line broke and finding a replacement is not easy. It works and when I have time I'll redo it properly with a nice metal line.
You can make it up with brake line. Do you have an inline 6 or a V8?
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