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Old 06-02-2017, 09:35 PM   #1
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Leaking diesel

I just changed my valves and hoses that connect my fuel tanks. I used 1" hose designed for diesel, it slips on to a barb fitting and is secured with two hose clamps. I rotated the screw part of the clamp so they are on opposite sides. They are as tight as I can make them and they still weep. Any ideas?
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Old 06-02-2017, 10:51 PM   #2
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If the hoses slip on they are the wrong size. 7/8" or 3/4"??
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Old 06-03-2017, 12:31 AM   #3
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Use a thread sealant on the barb fitting, it lubricates the fit, and helps seal it up.
I use Rector Seal #5, available at Lowe's.
As mentioned above, verify that the sizing is correct, if the hose pushes onto the barb easily, its probably the wrong size!
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Old 06-03-2017, 12:38 AM   #4
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I have been told that hose clamps are a no no on barb fittings.
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Old 06-03-2017, 12:46 AM   #5
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Agree with xsbank. I had 3/8 hose on 5/16 barbs and didn't realize it until I did a really thorough fuel system test. It's easy to have a mismatch.
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Old 06-03-2017, 01:29 AM   #6
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Well there are hoses designed to slip very tightly over barbed fittings that require no hose clamps.

Then there are hoses designed to be used with clamps. If you have two clamps on your hose and they are both actually seated over the barbed fitting and snugged down tight, I'd say it's unlikely that is where the leak is. Especially with new hose.

Unless the hose is way, way oversized for the fitting.

Clean and dry everything off and use paper towels to pin point the leak.
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Old 06-03-2017, 08:43 AM   #7
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Quote:
Originally Posted by kapnd View Post
Use a thread sealant on the barb fitting, it lubricates the fit, and helps seal it up.
I use Rector Seal #5, available at Lowe's !
+1. Tony Athen's favorite stuff for fuel fittings too. I've got a tube in my boating 101 bag.
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Old 06-03-2017, 10:27 AM   #8
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+1. Tony Athen's favorite stuff for fuel fittings too. I've got a tube in my boating 101 bag.


Very true. I just installed one of Seaboard Marine's Envirovent on my engine. A tube of Rectorseal 5 was includes.
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