Teflon lined tubing

[terry_208]

Somewhere I heard/read about using Teflon lined tubing for gas lines.  Can someone give me information about this?  I am planning to use throttle body injection with an in-tank pump.  The pump outputs 58-60 pounds pressure.

[KYBlueOval]

Terry, when you say "tubing" are you meaning hose? I have a hydroboost on my car and as I recall the braided SS hose, for the Hydroboost, is Teflon lined. So, if we are talking about Teflon lined braided hose (tubing), there should be no issue regarding its ability to handle the pressure.
FYI, this Teflon lined, braided SS hose is rather pricey, as are the fittings.
If we are not talking about the same tubing/hose, others here on the Forum will no doubt, chime in and give you a better answer.
John

[gasman826]

If the OP is referring to braided stainless hose, the Teflon (PTFE) lined hose is the way to go.  The braided stainless rubber lined hose and fittings are cheaper and will bend a tighter radius.  Unfortunately, the declining quality of the rubber, and fuel additives and higher fuel pressure contribute to fuel weeping as the rubber ages.  Since fuel injection was mentioned, I wouldn't even consider rubber hose.  With the fittings being different, I flushed all my rubber inventory several years ago.  I was already using PTFE lined hose for power steering, AC and high pressure fuel lines so changing over to all PTFE was no great leap.  PTFE is more expensive but so is leaking fuel, plugged fuel filters and clogged fuel injectors.  To help curb the cost of PTFE hose, I have started using more hard line to reduce the amount of hose.  After all that, I still use braided stainless rubber hose for coolant...heater hoses.

[RICH MUISE]

Hey Terry:............I'm assuming what you are asking about is at each end of the hard line runs (supply and return)where you need flex lines connecting to engine and tank. It would cost a fortune to run the entire length of the car...that braided PTFE hose was about 11.00 per foot back when I made all mine as Gary mentioned he used on his.
That said, I did use the braided PTFE(?) in the engine side 'cause it is visible. I used Gates special rubber lines to connect the gas tank. I forget the name of the Gates product, but it's specially made for today's fuels. I seem to recall using 2 types of braided lines...one was the PTFE Gary mentioned. I think a different line for the hydroboost or visa versa.

[terry_208]

I have never used anything except og gas and brake lines.   I guess my question should have been, what will make the best fuel supply and return lines and how should I assemble them?

[RICH MUISE]

I used 5/16 NICOPP for the long runs. My 4.6 was setup with the OEM Ford Springlock fittings that I wanted to keep, so I ordered Springlock adapters from Pure Choice Motorsports for the engine side. The braided /teflon lines were AN6 with fittings to suit. I also used Pure Choice springlock fittings for the inline '95 Lincoln fuel filter. The filter I installed at the front end of the supply line (on the frame), and continued on to the fuel log with the braided (#6) stuff.
Not sure if that answered your question.
I forgot which model '57 you're working on. Is your gas tank set up already with the pump?

[terry_208]

Rich, My pump required a hole to be cut into the top of the tank.  I cut/drilled just about where you installed yours in the tank.  I may have to cut and install a recess as you did in your tank.  I need to install the pump into the tank and check for clearance above the pump top.  My next question, running the supply and return fuel lines along the frame, how much room between them and the exhaust is a safe distance. 

[RICH MUISE]

You're going to run into the same problem I had. I did several changes/additions to my past posts suggesting where I put mine may not have been the best spot. The fuel lines will run into interference with the floor support just forward of the tank. With the tank out, you can "Notch" the support for clearance.
You'll need the recess box to avoid fuel lines getting up into the trunk area.
Proximity of the exhaust to the fuel lines wasn't an issue for me. If it gets too close in an area, you can wrap the exhaust.
Are you using Tanks Inc stuff?

[terry_208]

I have the og FoMoCo tank.  My TBI unit and pump are FiTech. 

I made a trial fit of the tank with pump installed. Of course, it didn't fit. I will do a practice run with the og tank and install the recess into it.