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Hey all - what are you using for sealing the threads on your fuel lines? A google search has all kinds of info and a lot of it seems contradictory. I'd like to hear it (read it) from the boys (and girls!) who know best.
My fuel lines are a combination of 6 AN in the engine compartment connecting to rubber fuel line hose at the electric fuel pump then rubber fuel line hose connecting to two inline fuel filters connecting to metal tubing going to the original behind the seat fuel tank. I have fought a series of small fuel seeps getting there. I have never be able to stop the seeping with any kind of sealant. The AN fittings never leaked. Trying adapters and various connectors never stopped the small leaks. Using the correct metal to metal connectors on tubing is the only way to prevent seeping. I double clamp any rubber fuel line hose to metal tubing connections and never had a seep. Sealants I previously tried turned out to not hold up over any length of time under the gasoline at 6 psi from the pump. Before the seeping stopped, I explored pipe dope, RTV, Teflon tape and a couple of other brands do not recall.
All threaded fuel fittings that I recall are tapered and seat in a fitting which does not require any sealant. If you are experiencing leaks, you have a damaged flare and/or fitting.
I believe the valve that screws into the bottom of the 1948-1952 tank is a pipe thread and therefore would need sealant, the rest are compression or flared and required no sealant as posted above. None of mine are leaking thankfully.
Imho, this is the best sealant. I use it on high vibration HVAC and fuel systems. It is very anaerobic so over tightening isn't necessary, and it's difficult to take apart once the joint is made up. This is a non-consumer grade industrial sealant, surprised to find it on Amazon. You don't use a sealer on flared fittings. Here's a tip - when you use rubber hose over metal tubing, first use a tubing cutter to make two or more annular rings on the tubing then slide the hose over the tube and clamp in the area of the rings.
I guess I've been lucky, I have never had fuel leak from a threaded connection, AN or pipe thread. When it comes to attaching a rubber hose to steel line I either use a compression barb fitting or a tubing flare tool and not completely collapse the tube into a double flare. When I have a friend available that owns a tubing beader I'll use it but I haven't been able to bring myself to spending ~ $150 for the maybe 10 - 15 times I would have actually used one over the past 48 years. I do know that when it comes to using tubing beaders either use the real thing or go at it from another direction. if it doesn't look like this (below) it's a tubing mangler.
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