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Diesel Fuel Thread Sealant

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Old 09-24-2007, 04:34 AM
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Diesel Fuel Thread Sealant

What are you all using when putting together diesel fuel components to prevent leaks. I'll be doing the GDP Walbro kit next weekend and want to have everything in hand.

Thanks
John
Old 09-24-2007, 06:50 AM
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Always had good luck with permatex 2B in the tube.
Old 09-24-2007, 06:55 AM
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Loctite 567
Old 09-24-2007, 07:36 AM
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Teflon tape.
Old 09-24-2007, 09:01 AM
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Originally Posted by jrussell
Teflon tape.
I've always been told that's a no no. The tape gets chewed up and will get into the lines. So I've been told at least. I use liquid teflon sparingly. Technically you shouldn't have to use anything. Pipe threads seal on the threads and should seal with enough torque on the threads, and flare fittings seal on the flare. Depends on which you are using. I would advise against the tape though.
Old 09-24-2007, 09:05 AM
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Originally Posted by vzdude
I've always been told that's a no no. The tape gets chewed up and will get into the lines. So I've been told at least. I use liquid teflon sparingly. Technically you shouldn't have to use anything. Pipe threads seal on the threads and should seal with enough torque on the threads, and flare fittings seal on the flare. Depends on which you are using. I would advise against the tape though.
I hear what you're saying. It is noteworthy, however, to mention that in the installation instructions for the GDP kit, they specifically recommend the use of teflon tape for the assembly of parts. Go figure.
Old 09-24-2007, 09:06 AM
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I'm about to build my own Walbro system using an Aeromotive regulator. Good question. I've been told to just use the Loctite.
Old 09-24-2007, 09:12 AM
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Loctite is saccharin based right? Which is like a sugary substance....
What does sugar do to injectors.......LOL
Old 09-24-2007, 09:22 AM
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Originally Posted by vzdude
I've always been told that's a no no. The tape gets chewed up and will get into the lines. So I've been told at least. I use liquid teflon sparingly. Technically you shouldn't have to use anything. Pipe threads seal on the threads and should seal with enough torque on the threads, and flare fittings seal on the flare. Depends on which you are using. I would advise against the tape though.
If you don't apply it properly then you might have problems...but then again that goes for just about anything that teflon tape is used for. The key is don't put tape on the first couple threads and it won't get in the system. Any pieces that did get in the system should be larger than 10 micron so the fuel filter should catch it.

Using a liquid seems worse to me. It probably wouldn't cause harm after being diluted with #2, but the filter isn't going to stop it from going through your CP3 and injectors.
Old 09-24-2007, 09:24 AM
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Don't get me wrong, that's just what I've been told. I use the liquid just like it sounds like you do the tape! Small amount, and start back a few threads.
Old 09-24-2007, 05:42 PM
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Use Rector Seal Tru-Blu it is for fuel oil (diesel) piping. It is availiable at most major plumbing suppliers. I used it to install my Glacier fuel system and to install my Motor Guard by pass filter---no leaks. Any air conditioning contractor that installs fuel oil furnaces probably will have it on their trucks, or can tell you where to get it.
Old 09-24-2007, 08:11 PM
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Thanks everyone. I think I have enough choices to get the job done. A plumber I know uses some megaloc thread sealant on home heating oil systems. Should work on diesel.
Old 09-25-2007, 10:19 AM
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Teflon tape or the paste. Sometimes the paste isn;t enough to seal... like on fuel tanks with a welded in bung, the bung gets a litte warped from the heat of welding.
Old 09-25-2007, 12:00 PM
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I used teflon tape downstream of the filters and nothing upstream. No leaks!
Old 09-25-2007, 05:21 PM
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i have always used the paste-never a problem


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