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#4617363 - 12/29/17 12:46 AM Off-road diesel, NPT thread sealant
BlakeB Offline


Registered: 09/20/17
Posts: 57
Loc: Southeast
I'm putting a new fuel hose and nozzle on our 500 gallon off-road diesel tank. The hose, nozzle and pump outlet are 3/4 NPT, do I need to apply a sealant of any kind or will the fittings seal fine without it?

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#4617366 - 12/29/17 12:51 AM Re: Off-road diesel, NPT thread sealant [Re: BlakeB]
KneeGrinder Offline


Registered: 11/28/17
Posts: 221
Loc: North of you Idaho
Yes, you need a sealant. Yellow teflon tape will be fine. Not white.

P.S. "Thats only if its taper threaded"

re read, 3/4 npt= use yellow Teflon tape


Edited by KneeGrinder (12/29/17 12:57 AM)
_________________________
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#4617368 - 12/29/17 01:11 AM Re: Off-road diesel, NPT thread sealant [Re: BlakeB]
double vanos Offline


Registered: 08/05/04
Posts: 1884
Loc: 5600 feet elevation, Arizona
Rectorseal T+2. I quit using Teflon tape the day I used this. Itís rated for kerosine so I donít see why diesel would keep it from working. Hasnít failed me yet.
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#4617371 - 12/29/17 01:16 AM Re: Off-road diesel, NPT thread sealant [Re: BlakeB]
Linctex Offline


Registered: 12/31/16
Posts: 6148
Loc: Waco, TX
Originally Posted By: BlakeB
I'm putting a new fuel hose and nozzle on our 500 gallon off-road diesel tank. The hose, nozzle and pump outlet are 3/4 NPT, do I need to apply a sealant of any kind or will the fittings seal fine without it?


Use Rectorseal Tru-Blu if you can find it.

or Permatex Teflon thread sealant.
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(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."

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#4617451 - 12/29/17 07:16 AM Re: Off-road diesel, NPT thread sealant [Re: BlakeB]
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4838
Loc: Houston, Texas
They always use some kind of liquid sealant on the pumps at the gas station. Looks white or grey looking usually
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#4617543 - 12/29/17 09:13 AM Re: Off-road diesel, NPT thread sealant [Re: BlakeB]
Rand Offline


Registered: 08/20/03
Posts: 12638
Loc: NE,Ohio
Ok so in true "slick deal" fashion I just ordered the Rectorseal Tru-Blu.




This is fine for water use right?
for $2.13 (2.60*.82)seems handy for those jobs that teflon tape fails bad on.

Could have used this when I replumbed the pipes for my Grandma's well pump and tank replacement
and her bathroom pipe stub replacements.

Ended up using a combination of tape and pipe dope for the 15-20 fittings .. was time consuming.

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#4618258 - 12/29/17 08:51 PM Re: Off-road diesel, NPT thread sealant [Re: KneeGrinder]
jhellwig Offline


Registered: 07/01/13
Posts: 1538
Loc: Ottumwa, Iowa
Originally Posted By: KneeGrinder
Yes, you need a sealant. Yellow teflon tape will be fine. Not white.

P.S. "Thats only if its taper threaded"

re read, 3/4 npt= use yellow Teflon tape



???? color has nothing to do with pipe size.


Edited by jhellwig (12/29/17 08:54 PM)
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#4618309 - 12/29/17 09:54 PM Re: Off-road diesel, NPT thread sealant [Re: jhellwig]
KneeGrinder Offline


Registered: 11/28/17
Posts: 221
Loc: North of you Idaho
Originally Posted By: jhellwig
Originally Posted By: KneeGrinder
Yes, you need a sealant. Yellow teflon tape will be fine. Not white.

P.S. "Thats only if its taper threaded"

re read, 3/4 npt= use yellow Teflon tape



???? color has nothing to do with pipe size.




Nope it sure doesn't. National pipe thread needs a sealant. That was my point. Diesel does require a color for Teflon though. Yellow.
_________________________
08 Tribeca 82k PUP 5w30 wix
06 Accord Hybrid 131k PUP 5w20 wix
02 Chevy k3500 97k Delvac 1 esp 5w40 wix
00 F350 133k Delvac 1300 15w40 wix

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#4618354 - 12/29/17 10:56 PM Re: Off-road diesel, NPT thread sealant [Re: BlakeB]
BlakeB Offline


Registered: 09/20/17
Posts: 57
Loc: Southeast
I actually used white teflon tape last night because I needed to use it and that's all I had. I'll swap it out one day when it warms up. Thanks for the replies.


Edited by BlakeB (12/29/17 10:56 PM)

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#4620194 - 12/31/17 11:25 PM Re: Off-road diesel, NPT thread sealant [Re: KneeGrinder]
jhellwig Offline


Registered: 07/01/13
Posts: 1538
Loc: Ottumwa, Iowa
Originally Posted By: KneeGrinder
Originally Posted By: jhellwig
Originally Posted By: KneeGrinder
Yes, you need a sealant. Yellow teflon tape will be fine. Not white.

P.S. "Thats only if its taper threaded"

re read, 3/4 npt= use yellow Teflon tape



???? color has nothing to do with pipe size.




Nope it sure doesn't. National pipe thread needs a sealant. That was my point. Diesel does require a color for Teflon though. Yellow.


Color has nothing to do with what's in the pipe. Use a decent quality tape instead of the cheap junk.
_________________________
Sparks fly from my fingers.

1995 Chevy K2500 Suburban lt 5.7
2008 Chevy Suburban 5.3
1983 Chevy K5 350

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#4621255 - 01/01/18 11:21 PM Re: Off-road diesel, NPT thread sealant [Re: jhellwig]
KneeGrinder Offline


Registered: 11/28/17
Posts: 221
Loc: North of you Idaho
Originally Posted By: jhellwig
Originally Posted By: KneeGrinder
Originally Posted By: jhellwig
Originally Posted By: KneeGrinder
Yes, you need a sealant. Yellow teflon tape will be fine. Not white.

P.S. "Thats only if its taper threaded"

re read, 3/4 npt= use yellow Teflon tape



???? color has nothing to do with pipe size.




Nope it sure doesn't. National pipe thread needs a sealant. That was my point. Diesel does require a color for Teflon though. Yellow.


Color has nothing to do with what's in the pipe. Use a decent quality tape instead of the cheap junk.


I would beg to differ. Yellow Teflon tape is for diesel, oil, natural, or propane gas. Might have use for other fluids, but white Teflon is not recommended for the fluids I listed.
_________________________
08 Tribeca 82k PUP 5w30 wix
06 Accord Hybrid 131k PUP 5w20 wix
02 Chevy k3500 97k Delvac 1 esp 5w40 wix
00 F350 133k Delvac 1300 15w40 wix

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#4625317 - 01/05/18 07:20 PM Re: Off-road diesel, NPT thread sealant [Re: BlakeB]
andy2001 Offline


Registered: 02/04/14
Posts: 1
Loc: MD

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