sealing diesel fittings - SailNet Community

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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


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Old 02-19-2010
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sealing diesel fittings

Hello: I think there's a simple answer for this, but I can't get find it in my books or my little chandlery. I have a leak coming off the diesel tank in my 30 Irwin Citation sailer. I suspect it's a very slow drip coming from the brass T-fitting that has a couple threaded couplings. I've tried gently tightening the couplings but it's still dripping about 2 oz. a week.

It looks like there's been some liquid sealer on the couplings. In the house I'd use teflon tape, but on this I suspect that's a wrong choice. Can anyone tell me what kind of goop might help seal those fittings, and whether I can find it at West Marine?

Follow up question... as soon as I disconnect those lines I expect that diesel will flow back out. Is there such a thing as 3/8" or 1/2" bungs that I could temporarily jam into the fuel lines when I take them off the fittings?

Thanks for any thoughts.
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Old 02-19-2010
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30,

Standard teflon tape (white in color) is not rated for fuel line connections. Ask the friendly folks at your local hardware store (or Home Depot or Lowes) for natural gas/petrol/LPG rated thread tape (yellow in color). It's usually somewhere close to the gas fittings and/or the propane grill section.

Where on the tank is your supply outlet?
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Old 02-19-2010
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I am a big fan of the yellow teflon tape as it has worked well for me. In a pinch, I have used the white stuff a few times and never had any problems.
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Old 02-19-2010
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ah, OK. This is a big help. Thank you.

Porfin, the tank is in the port settee, all glassed in. It feeds through a fitting near the top on the aft side. It's a bugger to get a good look at through two, small hatches.
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Old 02-20-2010
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A better sealer is loctite blue, which will allow disassembly. Any teflon tape works, in an emergency,
Cheers, Dumah
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Old 02-20-2010
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mitiempo will become famous soon enough mitiempo will become famous soon enough
You can combine yellow teflon tape and liquid pipe sealing compound for a good seal.





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