| Brass fuel line fittings [message #182616] |
Fri, 31 August 2012 14:44  |
zhagrieb
Messages: 676
Registered: August 2009
Location: Portland Oregon
Karma: 0
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I'm installing a second Carter pump, will have one for each tank, and will put a Summit Racing filter in front of each. Carter says no sealant on pump fittings but what about the brass NPT in and out of the aluminum NPT filter? I'd think brass to aluminum would seal OK with nothing in between but appreciate your input.
Glenn
Glenn Giere, Portland OR, K7GAG
'73 "Moby the Motorhome" 26'
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| Re: [GMCnet] Brass fuel line fittings [message #182619 is a reply to message #182616] |
Fri, 31 August 2012 15:09  |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Glenn,
My gut feel is that Carter is concerned with Teflon tape getting into the pump and rightly so from where I sit.
I can't tell you how many times I have disassembled pipe fittings wrapped with Teflon tape and found it had been applied
incorrectly. I find it wrapped in the wrong direction, WAY too many wraps or its beyond the end of the fitting.
Teflon tape should start 1 1/2 to two threads back from the end of the fitting, there should be two MAYBE three wraps max, and it
should be wrapped so that when the fitting is screwed in it tightens on the fitting.
In my opinion if you follow those "rules" there's no problem wrapping pipe threads even on the pump!
Regards,
Rob M.
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: Glenn Giere
I'm installing a second Carter pump, will have one for each tank, and will put a Summit Racing filter in front of each. Carter says
no sealant on pump fittings but what about the brass NPT in and out of the aluminum NPT filter? I'd think brass to aluminum would
seal OK with nothing in between but appreciate your input.
Glenn
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: Brass fuel line fittings [message #182668 is a reply to message #182616] |
Fri, 31 August 2012 20:51 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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| Glenn Giere wrote on Fri, 31 August 2012 15:44 |
I'm installing a second Carter pump, will have one for each tank, and will put a Summit Racing filter in front of each. Carter says no sealant on pump fittings but what about the brass NPT in and out of the aluminum NPT filter? I'd think brass to aluminum would seal OK with nothing in between but appreciate your input.
Glenn
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Glenn,
I'm not sure what Carter's issue is, as an instrument fitter I never left any metal - metal joint without something that was both lubricant and sealant. Even if the threads were a very clean cut, there is still the issue of micro-seal. I do not thing any leakage of gasoline is acceptable.
In your case, I would go search up one of the teflon loaded thread dopes. Locktite/Permatex make a very good one, but I do note recall the product number.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: Brass fuel line fittings [message #182728 is a reply to message #182616] |
Sat, 01 September 2012 08:43 |
GMCNUSA
Messages: 283
Registered: August 2006
Location: Indianapolis, IN
Karma: 0
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Senior Member |
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| Glenn Giere wrote on Fri, 31 August 2012 15:44 |
I'm installing a second Carter pump, will have one for each tank, and will put a Summit Racing filter in front of each. Carter says no sealant on pump fittings but what about the brass NPT in and out of the aluminum NPT filter? I'd think brass to aluminum would seal OK with nothing in between but appreciate your input.
Glenn
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I built a homemade brake system for the toad it was air cylinder, pump, solenoids and etc. Mostly brass and or an aluminum distribution block it was assembled with teflon tape and I had several very slight air leaks, retightening the fittings either did not work or took a lot of torque to stop the leaks. The assembly required disassembling some non leaking fittings. I decided to use a can of old teflon paste instead of the tape. Nothing leaked and it took less torque with the paste. The downside is I had to clean extra paste off of fittings but that took way less time than trying to get a nonleaking system with tape.
Larry Dilk
Indianapolis, IN
76 Eleganza II
Patterson 455,Turbo City TBI,
Just LOVE It!
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| Re: [GMCnet] Brass fuel line fittings [message #182737 is a reply to message #182728] |
Sat, 01 September 2012 09:20 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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When I was In the Instrument Engineering Design Business for Dow
Chemical, we (Dow) banned the use of teflon tape (In the early
1990"s) in all instrumentation application including all external
built items. It was also banned for air line installation and all
threaded fittings in the piping spec. Teflon paste was specified for
all application except for High temp installation over 400degF. Then
nickel or copper never-seize was used. The tape caused failures! I
think this now pretty much industry wide as Matt C said he did not use
the tape either.
JR Wright
>
>
> Glenn Giere wrote on Fri, 31 August 2012 15:44
>> I'm installing a second Carter pump, will have one for each tank,
>> and will put a Summit Racing filter in front of each. Carter says
>> no sealant on pump fittings but what about the brass NPT in and out
>> of the aluminum NPT filter? I'd think brass to aluminum would seal
>> OK with nothing in between but appreciate your input.
>>
>> Glenn
>
> I built a homemade brake system for the toad it was air cylinder,
> pump, solenoids and etc. Mostly brass and or an aluminum
> distribution block it was assembled with teflon tape and I had
> several very slight air leaks, retightening the fittings either did
> not work or took a lot of torque to stop the leaks. The assembly
> required disassembling some non leaking fittings. I decided to use a
> can of old teflon paste instead of the tape. Nothing leaked and it
> took less torque with the paste. The downside is I had to clean
> extra paste off of fittings but that took way less time than trying
> to get a nonleaking system with tape.
> --
> Larry Dilk
> Indianapolis, IN
> 76 Eleganza II
> Patterson 455,Turbo City TBI,
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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| Re: [GMCnet] Brass fuel line fittings [message #182738 is a reply to message #182735] |
Sat, 01 September 2012 09:36 |
GMCNUSA
Messages: 283
Registered: August 2006
Location: Indianapolis, IN
Karma: 0
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| Robert Mueller wrote on Sat, 01 September 2012 10:16 |
Larry,
Where did you get the Teflon paste? Sounds like just the stuff for GMC's!
Regards,
Rob M.
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Just my luck I guess, I was an industrial and commercial electrician and I found a can up in the steel that was probably left by the pipe fitters. I have had the can maybe 15 years or longer.
Larry Dilk
Indianapolis, IN
76 Eleganza II
Patterson 455,Turbo City TBI,
Just LOVE It!
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| Re: [GMCnet] Brass fuel line fittings [message #182801 is a reply to message #182735] |
Sat, 01 September 2012 17:39 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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Senior Member |
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| Robert Mueller wrote on Sat, 01 September 2012 09:16 |
Larry,
Where did you get the Teflon paste? Sounds like just the stuff for GMC's!
Regards,
Rob M.
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I got mine at the hardware store. Read the labels carefully to make sure you've got the Teflon type (PTFE).
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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