fuel seepage issues

[grumpyvette]

I got a call from FRANK, who decided to install a better fuel supply system and found several fittings leaked fuel, now theres several different types of fittings and most fuel line threaded connections are either designed for flare tube or use o-rings for sealing or the common push & clamp type but there are thread connections that require a thread sealant and most of the common gasket sealants won,t work under fuel pressure for long term use.
franks issue was not where lines slid over and clamped on the fittings but the threaded connections between the pump and fittings in the pump

ANY SCREW THREAD, on a FUEL LINE ADAPTER THREAD,will seldom be pressure tight on fuel as its a very thin fluid viscosity and many common thread sealant dissolve in either gas or alcohol which are both present in much of today's fuel supply, I know many guys try to use TEFLON tape , but this commonly results in flakes coming loose while the threads are being tightened and clogging injectors,is all too common, so experience has shown that having a decent fuel filter mounded between the tank and fuel pump and a second filter between the fuel pump and injectors or carburetor is a safer route to use. this is one of the few sealants fuel won,t degrade

related info

 

[87vette81big]

Have you ever tried or used Permatex Aviation gasket cement sealer Grumpy ?
It withstands all fuels like E10 gasoline, Aviation 100 LL, & High octane leaded race gas 110-120 motor octane.
I have been using it for near 20 years. No issues.
Works great on threaded assemblies, gasket dressing, ect.
Never hardens.
Similar to Permatex 300M But better.
Aviation gasket cement engineered for piston aircraft engines. Been around at least 30-40 years.
Can be hard to find. Napa specual orders it for me overnight.