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Off-road diesel, NPT thread sealant #4617363
12/29/17 01:46 AM
12/29/17 01:46 AM
Joined: Sep 2017
Posts: 73
Southeast
BlakeB Offline OP
BlakeB  Offline OP
Joined: Sep 2017
Posts: 73
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?

Re: Off-road diesel, NPT thread sealant [Re: BlakeB] #4617366
12/29/17 01:51 AM
12/29/17 01:51 AM
Joined: Nov 2017
Posts: 292
North of you Idaho
KneeGrinder Offline
KneeGrinder  Offline
Joined: Nov 2017
Posts: 292
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

Last edited by KneeGrinder; 12/29/17 01:57 AM.

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
Re: Off-road diesel, NPT thread sealant [Re: BlakeB] #4617368
12/29/17 02:11 AM
12/29/17 02:11 AM
Joined: Aug 2004
Posts: 1,951
5600 feet elevation, Arizona
double vanos Offline
double vanos  Offline
Joined: Aug 2004
Posts: 1,951
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.


Sabine Schmitz is the Queen of the 'Ring; Svetlana Kapanina is the Queen of the SKIES...
Re: Off-road diesel, NPT thread sealant [Re: BlakeB] #4617371
12/29/17 02:16 AM
12/29/17 02:16 AM
Joined: Dec 2016
Posts: 6,267
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,267
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.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Off-road diesel, NPT thread sealant [Re: BlakeB] #4617451
12/29/17 08:16 AM
12/29/17 08:16 AM
Joined: Nov 2009
Posts: 4,943
Houston, Texas
motor_oil_madman Offline
motor_oil_madman  Offline
Joined: Nov 2009
Posts: 4,943
Houston, Texas
They always use some kind of liquid sealant on the pumps at the gas station. Looks white or grey looking usually


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Off-road diesel, NPT thread sealant [Re: BlakeB] #4617543
12/29/17 10:13 AM
12/29/17 10:13 AM
Joined: Aug 2003
Posts: 12,908
NE,Ohio
Rand Offline
Rand  Offline
Joined: Aug 2003
Posts: 12,908
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.



2019 Jeep Cherokee Trailhawk 2.0T
Re: Off-road diesel, NPT thread sealant [Re: KneeGrinder] #4618258
12/29/17 09:51 PM
12/29/17 09:51 PM
Joined: Jul 2013
Posts: 1,678
Ottumwa, Iowa
jhellwig Offline
jhellwig  Offline
Joined: Jul 2013
Posts: 1,678
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.

Last edited by jhellwig; 12/29/17 09:54 PM.

Sparks fly from my fingers.

1995 Chevy K2500 Suburban lt 5.7
2014 Toyota Sienna
1983 Chevy K5 350
Re: Off-road diesel, NPT thread sealant [Re: jhellwig] #4618309
12/29/17 10:54 PM
12/29/17 10:54 PM
Joined: Nov 2017
Posts: 292
North of you Idaho
KneeGrinder Offline
KneeGrinder  Offline
Joined: Nov 2017
Posts: 292
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
Re: Off-road diesel, NPT thread sealant [Re: BlakeB] #4618354
12/29/17 11:56 PM
12/29/17 11:56 PM
Joined: Sep 2017
Posts: 73
Southeast
BlakeB Offline OP
BlakeB  Offline OP
Joined: Sep 2017
Posts: 73
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.

Last edited by BlakeB; 12/29/17 11:56 PM.
Re: Off-road diesel, NPT thread sealant [Re: KneeGrinder] #4620194
01/01/18 12:25 AM
01/01/18 12:25 AM
Joined: Jul 2013
Posts: 1,678
Ottumwa, Iowa
jhellwig Offline
jhellwig  Offline
Joined: Jul 2013
Posts: 1,678
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
2014 Toyota Sienna
1983 Chevy K5 350
Re: Off-road diesel, NPT thread sealant [Re: jhellwig] #4621255
01/02/18 12:21 AM
01/02/18 12:21 AM
Joined: Nov 2017
Posts: 292
North of you Idaho
KneeGrinder Offline
KneeGrinder  Offline
Joined: Nov 2017
Posts: 292
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
Re: Off-road diesel, NPT thread sealant [Re: BlakeB] #4625317
01/05/18 08:20 PM
01/05/18 08:20 PM
Joined: Feb 2014
Posts: 1
MD
andy2001 Offline
andy2001  Offline
Joined: Feb 2014
Posts: 1
MD


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