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Best thread sealant for fuel fittings. #2654125 05/10/19 07:12 PM 05/10/19 07:12 PM
Joined: Jun 2007 Posts: 1,169 clarks summit pa 73cuda340 OP super stock
73cuda340 OP super stock Joined: Jun 2007 Posts: 1,169 clarks summit pa	What seems to be the best sealant for sealing fuel fittings? I've read good things about the Permatex Aviation Form-A-Gasket No. 3 Sealant. Are there any better options out there? The fittings on my fuel pressure regulator have a tiny leak and I need to seal them up before something catches on fire. 1973 Cuda 528 all aluminum Hemi, 4 speed, 3.23 Sure-Grip, (JA5) Silver Frost Metallic 1973 Challenger Rallye 340 1985 W150 Power Ram prospector 1986 Camaro IROC-Z 305 tpi

Re: Best thread sealant for fuel fittings. [Re: 73cuda340] #2654133 05/10/19 07:34 PM 05/10/19 07:34 PM
Joined: Nov 2003 Posts: 597 R robertop mopar
robertop mopar R Joined: Nov 2003 Posts: 597	I have recently used Locktite thread sealant stick, that comes in a paste form and cannot clog fuel lines. So far so good.

Re: Best thread sealant for fuel fittings. [Re: robertop] #2654160 05/10/19 08:47 PM 05/10/19 08:47 PM
Joined: Jan 2003 Posts: 3,680 South San Francisco, Ca 70sixpkrt master
70sixpkrt master Joined: Jan 2003 Posts: 3,680 South San Francisco, Ca	What about this? [img]http://www.imgur.com/hxlGUJt.gif[/img] 4-speed 3:54 Dana 13.01 @107.93 with street tires (not hooking up)

Re: Best thread sealant for fuel fittings. [Re: 73cuda340] #2654162 05/10/19 09:03 PM 05/10/19 09:03 PM
Joined: Feb 2008 Posts: 452 Monrovia, So-Cal, USA racerhog mopar
racerhog mopar Joined: Feb 2008 Posts: 452 Monrovia, So-Cal, USA	Will not leak after using this stuff.... But.... It's a [censored] if you have to take it apart after is sets up... But your fitting will not leak, For Sure.... https://www.zoro.com/permatex-pipe-joint-compound-16-oz-black-80045/i/G1623693/ Bob(Cowboy)Hogan Monrovia So-Cal

Re: Best thread sealant for fuel fittings. [Re: racerhog] #2654182 05/10/19 10:01 PM 05/10/19 10:01 PM
Joined: Nov 2004 Posts: 25,050 Texas GoodysGotaCuda 5.7L Hemi, 6spd
GoodysGotaCuda 5.7L Hemi, 6spd Joined: Nov 2004 Posts: 25,050 Texas	I've had good luck with this on my brake and fuel fittings. 1972 Barracuda - 5.7L Hemi, T56 Magnum 6spd - https://www.facebook.com/GoodysGotaHemi 2020 RAM 1500 [img]https://i.imgur.com/v9yezP9.jpg[/img]

Re: Best thread sealant for fuel fittings. [Re: 73cuda340] #2654206 05/10/19 11:27 PM 05/10/19 11:27 PM
Joined: Mar 2003 Posts: 4,848 Memphis HemiRick master
HemiRick master Joined: Mar 2003 Posts: 4,848 Memphis	Fuel fittings shouldn't need any type of sealant, they all are metal to metal crush type 45 degree seals. If they are tight enough they seal....Otherwise on hose to line connections double up the hose clamps if you want to be extra safe. Take care, Rick 68 Coronet R/T 440 & 68 Charger 528 Hemi,and 5 Challengers! 6 cyl, 318, 360, 383, 451

Re: Best thread sealant for fuel fittings. [Re: HemiRick] #2654217 05/11/19 12:46 AM 05/11/19 12:46 AM
Joined: Aug 2006 Posts: 247 DuPont, Washington D DZJim enthusiast
DZJim enthusiast D Joined: Aug 2006 Posts: 247 DuPont, Washington	Originally Posted by HemiRick Fuel fittings shouldn't need any type of sealant, they all are metal to metal crush type 45 degree seals. If they are tight enough they seal....Otherwise on hose to line connections double up the hose clamps if you want to be extra safe. Like he sez...no sealant. Its a metal-to-metal situation. You maybe able to glue together low pressure liquid or gaseous connections and prevent a leak, Try that with 3,000psi aircraft hydraulic systems? or, even your wife's gas clothes dryer...read the install instruction...NO sealer/glue/compound/etc. on the flare fitting.

Re: Best thread sealant for fuel fittings. [Re: 73cuda340] #2654222 05/11/19 02:20 AM 05/11/19 02:20 AM
Joined: Aug 2003 Posts: 43,126 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,126 Bend,OR USA	There are two different standard types of fittings used on fuel systems in America, National Pipe Thread,NPT, and inverted flare. Pipe thread usually need a pipe sealer, inverted flares do not Learn on how to identify them now and make your life easier in the future Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Best thread sealant for fuel fittings. [Re: Cab_Burge] #2654276 05/11/19 10:16 AM 05/11/19 10:16 AM
Joined: Sep 2003 Posts: 19,355 north of coder moparx "Butt Crack Bob"
moparx "Butt Crack Bob" Joined: Sep 2003 Posts: 19,355 north of coder	like cab says, NO sealant on flared fittings ! taper pipe needs sealant. i use loctite 567. it works with gasoline and oils, plus, it also acts as a thread galling preventer.

Re: Best thread sealant for fuel fittings. [Re: Cab_Burge] #2654281 05/11/19 10:19 AM 05/11/19 10:19 AM
Joined: Jun 2018 Posts: 350 Mequon, WI G gzig5 enthusiast
gzig5 enthusiast G Joined: Jun 2018 Posts: 350 Mequon, WI	I'm using the Permatex Aviation this week when I put in the new AVS2 Carb. The Holley pressure regulator and the carb inlet hard line both have NPT threads. The fuel system is not the place to screw around with marginal or inappropriate sealants.

Re: Best thread sealant for fuel fittings. [Re: gzig5] #2654292 05/11/19 10:57 AM 05/11/19 10:57 AM
Joined: Jan 2003 Posts: 10,704 North Dakota 6PakBee I Live Here
6PakBee I Live Here Joined: Jan 2003 Posts: 10,704 North Dakota	Sealer "We live in a time when intelligent people are being silenced so that stupid people won't be offended".

Re: Best thread sealant for fuel fittings. [Re: 6PakBee] #2654441 05/11/19 10:16 PM 05/11/19 10:16 PM
Joined: Jun 2007 Posts: 1,169 clarks summit pa 73cuda340 OP super stock
73cuda340 OP super stock Joined: Jun 2007 Posts: 1,169 clarks summit pa	I have one of the Holley Hp billet regulators with NPT fittings, so no flare fittings. 1973 Cuda 528 all aluminum Hemi, 4 speed, 3.23 Sure-Grip, (JA5) Silver Frost Metallic 1973 Challenger Rallye 340 1985 W150 Power Ram prospector 1986 Camaro IROC-Z 305 tpi

Re: Best thread sealant for fuel fittings. [Re: 73cuda340] #2654534 05/12/19 10:43 AM 05/12/19 10:43 AM
Joined: Dec 2007 Posts: 12,587 Great Neck,LI,new york hemi-itis I Live Here
hemi-itis I Live Here Joined: Dec 2007 Posts: 12,587 Great Neck,LI,new york	I must be OLD! I still have a few rolls of teflon tape............ Most of my fitting these days are AN. HEMI-ITIS has no cure. My condition is fully BLOWN!!

Re: Best thread sealant for fuel fittings. [Re: 6PakBee] #2654611 05/12/19 01:12 PM 05/12/19 01:12 PM
Joined: Sep 2003 Posts: 19,355 north of coder moparx "Butt Crack Bob"
moparx "Butt Crack Bob" Joined: Sep 2003 Posts: 19,355 north of coder	Originally Posted by 6PakBee Sealer that is also very good. i intend to go to that when my 567 supply is done.

Re: Best thread sealant for fuel fittings. [Re: 73cuda340] #2654615 05/12/19 01:21 PM 05/12/19 01:21 PM
Joined: Jan 2003 Posts: 15,311 Omaha Ne T TJP I Live Here
TJP I Live Here T Joined: Jan 2003 Posts: 15,311 Omaha Ne	Having spent several years in positions that dealt with high to ultra high vacuum chambers, loctite became my friend when trying to seal pipe thread connections. If it won't let a helium molecule through at 10-8 torr its not going to leak period. I used the hardening types due to the out-gassing of the paste types www.tandmautomotive-omaha.com

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