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Re: use teflon tape on a gas fuel line?
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Posted by Andy Martin on November 18, 2004 at 11:54:15 from (64.219.39.195):
In Reply to: use teflon tape on a gas fuel line? posted by Dave D on November 18, 2004 at 10:30:26:
Teflon tape and pipe dope are not sealants, they are lubricants. I'll hear a lot of squeals, but not from plumbers. Tapered pipe threads that leak will seldom be sealed by the application of a lubricant except that you can get them tighter. If there is very low pressure then the dope will seal for a while. Brass is not bad to gall against itself, but aluminum is. On a diesel carburetor with the pot-metal body, I always use a little pipe dope or oil for lubricant. It makes as much sense to put dope on flare nut threads as it does on tapered threads. If you need the lubrication, use it. Teflon tape dissolved by gasoline and burned in the engine does no harm and the joint was still lubricated when assembled. Hydraulic fluid and motor oil will not dissolve teflon tape so it is a problem in those services by small pieces plugging orifices. I use a teflon paste on hydraulic lines. Looks like dope, feels like dope, never hardens.
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