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Wrenchin’ Tip – Fuel Line Threads 4/24/2010

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You'll have to nav over to my blog to view pics.

I’ve worked on the gas delivery systems in my Vette and Mustang. This always involves removing gas lines from the carb or throttle bodies and of course the possibility of leaks after re-installing them. One of the last things you want is gas leaking here and there in your engine bay..NOT GOOD!

I’ve always used teflon tape to wrap the threads.

Pic -

Teflon Tape on one of the Corvette's fuel lines.

This helps seal the connection, and sometimes with older cars you need that was the threads aren’t bad enough to replace….errk…Getting new fittings and flaring the gas lines is sometimes necessary and can be a pain..but if threads are really worn, take the time to do that. Yes..I know cutting the lines and get correct type hose and some clamps you’ll be fine…but it won’t look as good and since both of my car are trophy winners at car shows, I try to keep them looking professional.

Using the tape does have a of couple drawbacks. It can form a lip around the gas line opening, partially blocking the flow. Additionally, pieces can tear off during installation and get into the system. So some companies offer a thread sealer in a tube, which is made of teflon in paste form. I’m using that next time I have to go into the fuel systems. I know that Permatex makes some (what don’t those people make!?!?!!?!). They call it thread sealant and it comes in different “models” like High Performance and High Temperature.

Thanks for reading.

Tim Sweet
70 Mustang Coupe and 84 Vette

I replaced all the fuel lines and brake lines on my 65 a few years ago, and I used this flaring tool and the thread seal that comes in a tube.  I have never had a leak, and I have never used the teflon tape.  You don't need a real expensive flaring tool to work on these old Mustangs.

I was playing arond and tried to flare a brake line before. I never could get it right. It always was crooked.

Then you weren't holding your mouth right.   ;D
It takes practice, and if you have some old tubing lying around, cut it into 4 or 5 inch pieces and practice.  Once you get your mouth right, it's a piece of cake.  ;D It takes strong fingers though. 

yeah, I was just playing around at work. I still work at advance auto, so i have plenty of tools and stuff to play with. :D


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