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I would definitely NOT pull a vacuum on a tank that has had fuel in it with
a shop vac! Fuel vapors and sparks don't get along well. I would suggest you
use a venturi type vacuum source. Harbor Freight has them for about $35.

If you want to use a sealant on the threads, one option is Flourosilicone.
This is not standard silicone. Dow makes it and I think it is #67 (can't
remember) but it is pricey at about $70 a tube.  It is very fuel and oil
resistant. I used to use it to seal Porsche engine case halfs.

Regards
Brent Regan

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Please send your photos and drawings to marvkaye@olsusa.com.
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