Fuel inlet fitting torque
Mar 21, 2021 | 04:04 PM
Thread Starter
Safety Car
Joined: Jan 2004
Posts: 4,549
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From: Glastonbury CT
Fuel inlet fitting torque
Is there a torque or is teflon tape a alternate for fuel leaks?
Mar 21, 2021 | 04:12 PM
Le Mans Master
Joined: Aug 2017
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From: Cool Northern Michigan
The torque specs is "Snug".
Mar 21, 2021 | 05:31 PM
Drifting
Joined: Aug 2019
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What fitting are you talking about?
Mar 21, 2021 | 06:06 PM
Team Owner
Joined: Jan 2006
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From: Into the Mystic And yet, despite the look on my face, you're still talking TN
St. Jude Donor '09 thru '25
I don't think Teflon tape is supposed to be used on that fitting because of the possibility of pieces of the tape getting into the carb. If it leaks you have another issue.
Mar 21, 2021 | 07:30 PM
Advanced
Joined: Jun 2016
Posts: 83
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From: Allentown,Pa
I coated the threads where fuel line attaches to carburetor with Permatex Aviation Form-a-Gasket sealant liquid, 3H item # 80019 and snugged tight.
Mar 22, 2021 | 09:31 AM
Instructor
Joined: Nov 2020
Posts: 143
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From: Colorado Springs
My leak was fixed with a new Teflon gasket that sits right on the end of that fitting in a groove. Advance auto has them cheap. It’s a q-jet.
Mar 22, 2021 | 11:20 AM
Safety Car
Joined: Oct 2007
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From: Seattle Area Washington
Section 6C page 35 of the 77 Service Manual has all the Torque Specifications for the M4MC carburetor if that's what your working on.
Mar 23, 2021 | 06:32 PM
Thread Starter
Safety Car
Joined: Jan 2004
Posts: 4,549
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From: Glastonbury CT
Correct 400 inch lbs fuel inlet!
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Mar 23, 2021 | 07:16 PM
Race Director
Joined: Jan 2000
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From: San Jose CA
Quote:
Originally Posted by
Capt. Shark
I don't think Teflon tape is supposed to be used on that fitting because of the possibility of pieces of the tape getting into the carb. If it leaks you have another issue.
Yup. The fuel nut has a gasket. The fuel line to fuel nut is a flare fitting.
Mar 23, 2021 | 09:50 PM
Safety Car
Joined: Oct 2007
Posts: 4,382
Likes: 1,752
From: Seattle Area Washington
Quote:
Originally Posted by
fake
Correct 400 inch lbs fuel inlet!
Or ÷ by 12 = 33.333333 ft. lbs.
Never had one leak with new nylon gasket and proper torque specs.
Last edited by bmotojoe; Mar 23, 2021 at 09:54 PM .
Mar 23, 2021 | 10:43 PM
Team Owner
Joined: Jan 2006
Posts: 37,637
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From: Crossville TN
Must always use two wrenches to tighten or loosen that Q-Jet fuel inlet fitting. Otherwise, you can easily crack/damage the [weak] bowl casting.
Mar 25, 2021 | 11:15 AM
Le Mans Master
Joined: Sep 2003
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From: eastern NC
Quote:
Originally Posted by
7T1vette
Must always use two wrenches to tighten or loosen that Q-Jet fuel inlet fitting. Otherwise, you can easily crack/damage the [weak] bowl casting.
and that fuel nut is 1", it's a good idea to have a 1" box wrench handy for that alone.
An adjustable wrench can work in a pinch, but the box wrench is best.
Good luck...
GUSTO
Mar 25, 2021 | 12:50 PM
Race Director
Joined: Jan 2000
Posts: 12,399
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From: San Jose CA
I had to use a box wrench, my adjustable wrench was too wide and got in the way of the fuel line wrench on the flare nut.
and that fuel nut is 1", it's a good idea to have a 1" box wrench handy for that alone.
