nitrile rubber AN hose VS PTFE AN Hose

[88Stanger]

I did a search to see if anyone has talked about these two and the differences between them, from ease/difficulty of use to ease/difficulty to installing fittings.

Rubber AN Hose Positive:
1.) Very flexible so making tight bends is good and easy
2.) Typically a good automotive shop may have a limited supply

Rubber AN Hose Negatives:
1.) Cost can be high
2.) Stainless Steel outside cover can be very painful to work with after cut
3.) Fumes can emit from the hose
4.) Installing fittings can make a person say things they should not, and at times end up with a hose to short because the ends had to be cut multiple times to get the damn end on.

PTFE AN Hose Positives:
1.) Cost is typically cheaper
2.) Fumes will not emit from the hose
3.) Some fluids that can eventually eat up rubber will not harm PTFE
4.) Installing the fittings is a lot easier, ALOT
5.) The lines can come with Stainless Steel cover or Nylon colored

PTFE AN Hose Negatives:
1.) Does not bend as easily as rubber hose and bending radius is reduced which may require more fittings to be installed (Note that I can install 5 PTFE fittings for amount of time I spend on Rubber AN hose)
2.) If you need tight radius bends, more fittings can mean possible leaks and which some say costs more, but my time is worth more and sometimes I have had to junk a piece of Rubber AN hose because after cutting it several times to get it on, to short.

Anyways, as you can tell, I have not had very good times with Rubber AN hoses. I will still use them when needed and when I cannot find a way to use PTFE. I just wanted to get this out there and see what others have to say about PTFE that have used it.

[70STOVEBOLT]

The only thing I have used PTFE for is on my fuel line from the pump to the regulator, but I cheated, I crimped the ends on. At work we have Weatherhead SS braided outer with PTFE inner and a machine to crimp the ends with. We use a chop saw with a thin abrasive type blade (think cutoff wheel for die grinder) to cut the hose and it usually will not fray after being cut, but sometimes it does and it makes getting the hose end on difficult. I have never used the rubber hose with the SS braided cover.

[MidLifer]

If you use the rubber hose for fuel line your garage will smell like gas (and your cab if you have a cab tank. I would guess the ethanol would eventually degrade the rubber too. Use PTFE for fuel.