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Old 06-01-2009, 20:04   #1
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Sealing Diesel Fittings

I am in the building stages of a new diesel tank in my boat. I am building the tank into the bilge, using epoxy and glass. I am planning on using a SS barbed thru hole fitting to accept the 1 1/2 fuel supply line. I have ordered nitril gasket that will compress when I tighten up the fitting. My question if was to apply a sealant around the nitril, epoxy and SS what type of sealant would be appropriate. Thanks in advance.
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Old 06-01-2009, 20:27   #2
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Quote:
My question if was to apply a sealant around the nitril, epoxy and SS what type of sealant would be appropriate.
Nitril is a seal. You don't normally need a sealant when you use a gasket. Nitril is a good choice. The compressionn of the seal is supposed to work all by iteslef.
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Old 06-01-2009, 22:51   #3
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Everything Pblais said...

In addition, never use teflon tape on diesel system fittings. Little bits can come off and make a real mess downstream.
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Old 06-01-2009, 23:31   #4
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Can I ask why you wouldnt just glass in a fiberglass tube as a supply and pickup?
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Old 07-01-2009, 09:16   #5
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Thanks all for the feed back.


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Can I ask why you wouldn't just glass in a fiberglass tube as a supply and pickup?
I spent allot of time debating this very thing. The area that the fill connects to tapers to about a 4" section. I am building sections of the tank then tabbing them into the bilge and laying up all together inside the bilge, because of the complex angles in the tapered area I was not 100% confident that I would not get any pin holes in the hard to access areas. In the end the SS thru hole was less time consuming I will build a support saddle adjacent to the barbed fitting to attach to the fill hose. I plan to pressure test the tank on completion, will post some pic when complete.
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Old 07-01-2009, 09:28   #6
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I've read many times that is is preferable to have the fill port extend into the tank some distance to help minimize the foaming when filling...
Good luck with this!! Pics?
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Old 07-01-2009, 09:42   #7
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If and when you do need a sealant for diesel, this works great.



And yes, never use Teflon tape in a diesel fuel system. It actually can leak as well.
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