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Andy and Brent,
I would suggest you use PRC tank sealant on assembly of your repaired
threads.  Products Research Corp (PRC) has made proprietary formula
manganese dioxide/epoxy cured polysulfide/polythioether two part rubber
tank, faying surface, fillet and window installation sealants for years and
they are the best.  It is made right here in Mojave, CA.  The company has
changed hands recently but still sells in my API catalog under PRC.  It is
more commonly known as Pro Seal.  There are many varieties with properties
for kerosene, naptha, gasoline and various other sealing chores with
strengths and adhesions as well as setup times and mixing and application
thicknesses for any application.
I reccomment PR 1422 B2 for your job.  PR 890 B2 is available from Aircraft
Spruce and will last a long time in this application even tho it is a
general purpose sealant.
The A or B stands for thin or thick.  The 1/2, 1, or 2 stands for the pot
life in hours.  All cure in 48 hours although some can be fueled in as
little as two hours at 77 deg F.
I have had much success making built in gaskets with PRC using the same
release tape method we use for all of our micro/flox jobs.
Thanks,
Walter Dodson  IV-P 62.175%

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