Thread sealant for gas line

There is a small threaded pipe between carb and sediment bowl. What type of thread seal method works there with gasoline? I have some permatex high tack gasket sealant that Ive used on bolt threads for oil. Ok for gas per bottle. Any of the Teflon tapes work? Blue or gray maybe? Thanks in advance

Never use Teflon Tape on your tractor fuel system. Tape is OK for your household plumbing leaks but not anything on your vehicles. The best product to use is made by E-SEAL and is called GASOILA see AD. The Fuel Tank and Sediment Bulb uses a 3/8-NPT thread size. I advise to not remove the Bulb if not absolutely necessary. Be aware that some new Cheena-made aftermarket units are junk and will ruin your tank threads. Many are quick to replace the Sediment Bulb when fuel issues arise but the only part that does the actual work is the APN-9194 Valve Stem. There is a rubber seal on the Stem that will wear, get chewed up over time and is the main suspect when leaks arise. It is a $6 part at a reputable dealer and theres no need to buy and replace the entire Bulb assembly, a $20 part minimum, more on Hundred Series models. PM is the key to keeping system properly efficient with cleaning of screens and carb performance. Also, the Fuel lines all use the industry standard size 7/16-24 UNS (Special), designed for fuel and brake line fittings. If you cross-thread the Bulb or Carb female threads inserting the compression fittings, they cannot be fixed and will leak. Replace Valve Stem with new, and I suggest to dab the 8-32 screw on handle with thread sealant so it cant fall off in the field. I have a jar of GASOILA and I could send you some for your Bulb. Email is open

FORD TRACTOR SEDIMENT BULB & ISSUES:


FORD N-SERIES TRACTOR FUEL SEDIMENT BULB & 3 FILTER SYSTEM:


BULB VALVE STEM CONTROL HANDLE, 8-32 SCREW:




*NOTE: Worn 'Seals on Valve Stem, major cause of fuel leaks.



Tim Daley(MI)

Ok Im likely going to get yelled at for this I have used the yellow tape for multiple gas and oil lines. Really only for pipe thread connections. I back the tape back off the leading edge of the threads, in an effort to keep tape pieces from entering the system. Been doing it for 30+ years with no issues.

Yelled at for what? You stop the leak, thats what counts.

Not going to yell, never, but yeah, I had my own shop, worked on hundreds of tractors, and found many guys with fuel issues and root cause was tape had pieces break off and clog up the carb systems... just saying/advising and it is your tractor and you can do whatever you want.

TPD

That is the proper way to use teflon tape. Start two threads back from the end and wrap clockwise working away from the end. Same goes for hydraulic fittings. Be careful not to overtighten because the teflon lowers the friction.

(quoted from post at 06:00:08 11/22/22) That is the proper way to use teflon tape. Start two threads back from the end and wrap clockwise working away from the end. Same goes for hydraulic fittings. Be careful not to overtighten because the teflon lowers the friction.

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Yup, what Mike posted. There are many procedures that have to be done just right and often people don't take the care needed to follow the correct procedure. No need to condemn the use of a certain product or tool due to misuse.

Sealer gets used on tapered pipe threads only. On other fittings the threads don't do the sealing.

I use the yellow pipe dope in a tube.... Never an issue

Bottom line - address root cause problem and fix it. You shouldn't need to apply anything --- OEM never used stuff on threads. If you have a fuel leaking issue, do you really want to depend on a Band-Aid fix???

TPD

(quoted from post at 03:14:06 11/23/22) Bottom line - address root cause problem and fix it. You shouldn't need to apply anything --- OEM never used stuff on threads. If you have a fuel leaking issue, do you really want to depend on a Band-Aid fix???

TPD

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It appears to me that everyone is posting about applying an appropriate sealer onto the threads BEFORE assembly not OVER the assembly afterwards.

(quoted from post at 07:43:17 11/23/22)

(quoted from post at 03:14:06 11/23/22) Bottom line - address root cause problem and fix it. You shouldn't need to apply anything --- OEM never used stuff on threads. If you have a fuel leaking issue, do you really want to depend on a Band-Aid fix???

TPD

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It appears to me that everyone is posting about applying an appropriate sealer onto the threads BEFORE assembly not OVER the assembly afterwards.

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NPT threads should be self-sealing without the need for any sealer, but these days not much is made to the true thread pitch and taper of the spec, so pipe dope or tape, or both, are used by many.

(quoted from post at 03:14:06 11/23/22) Bottom line - address root cause problem and fix it. You shouldn't need to apply anything --- OEM never used stuff on threads. If you have a fuel leaking issue, do you really want to depend on a Band-Aid fix???

TPD

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teflon is only a lubricant, it does nothing to seal

(quoted from post at 16:05:28 11/27/22) teflon is only a lubricant, it does nothing to seal

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On a frying pan, you are correct, but teflon tape allows poorly made NPT threads to be threaded on farther, and therefore provides a better chance to seal. Also, when the threads are tightened, the teflon tape deforms and fills in the gaps so it does provide some amount of sealing.

Yeah it does!