Hey,
Im wondering if its ok to use PTFE under the hood for the supply and return lines to the engine. I understand theses are a great modern line but will they hold up to the movement\vibration of the engine? Has anyone done this?
Thanks!

 

They will work just fine. I even use them for my power steering lines.

 

Been running Aeroquip braided teflon lines from tank to rails (supply and return) since 2006.

Before that, I had been running Earls braided rubber and had been battling a fuel-like odor in the garage for years before I figured out that it was permeating through the rubber.

https://nastyz28.com/threads/earls-b...l-vapor.72426/

I also covered them in heat shield wrap whenever they got anywhere near exhaust.

But, not one single issue or problem in ~17 years now.

I also stress relieved the connections at the fuel rail by putting a bracket on the valve cover to secure them.

 

Braided PTFE is ideal for fuel, even moreso if alcohol is in it. They don't flex as much as a rubber hose but they do flex so just accomodate your bends more carefully with the fittings from the start and ensure they have gentle arcs to their destination.

If flexing/weight is a concern, give them a bracket so all the tension isn't resting on the fitting. In any case, braided PTFE is my choice for flexible fuel lines and I would recommend it to others. I use Evil Energy kits and so far haven't had a single failure that wasn't operator error. PTFE lines are slightly more annoying to assemble when it comes to getting the right amount of the braiding unraveled to let the ferrule seat in correctly, but if you do mess one up, they can be disassembled and reused usually.

I also prefer using a death wheel / cut off disc to cut them because the shearing action of scissor type mechanisms really crushes the PTFE. Always follow up with brake clean when introducing small particles into your lines.

 

Yes. Same here... small cutoff wheel on a Dremel makes a nice clean cut. Just wrap the area to be cut with duct tape or masking tape.

 

Uncle Tony just did a Youtube on this yesterday.

 

Thanks everyone! I got some PTF hose ends etc.. and plan on installing.. I figured I should finally replace the original rubber lines under the hood on my 85...