eng208

Hey, I pulled my lift pump off to fix a very small oil leak from the gasket. Put the pump back on, fired it up and checked for leaks and the doggone fuel line from the lift pump to the filter was leaking. I tried everything I knew to do. I took the line completely off and cleaned it thoroughly (it was already clean). Will teflon tape on the thread part work? I know you shouldn't use it on some gas lines because it may deteriorate and enter the fuel system. If the tape was on the threads only though, and it deteriorated, how would it get into the line?
Any help would be appreciated.
Chris

fschiola

I have heard the only teflon tape to be used with gas or fuel is the yellow colored tape. I think you can use teflon paste, it says it's compatable with gas or oil, or Permetex.

Dufrain

I know the white teflon tape melts when gas hits it,im not sure about diesel,but i bet it will eat it up too,It may take longer.

kd460

I agree, use the yellow teflon tape. I was able to pick it up at of all places, Home Depot! In the plumbing department. Although I did use the white teflon tape for a temporary fix on my WIF sensor. After two weeks it was still OK. Did not use it any longer than that so don't know about long term. Kevin

Dr. Evil

If you're going to use teflon - make sure its petroleum rated....but I wouldnt recommend it since you dont want teflon entering your fuel system. As someone already mentioned, a much better choice would be the liquid teflon paste made my Loctite or Permatex. Ive used the Loctite PST 567 thread sealant and it works great. Petroleum rated (black or blue) RTV silicone would work for you as well.

http://www.loctite.com/int_henkel/lo...d=130&layout=1

handymantim

What kind of threads are they? Compression (flared end on fuel line) or are they pipe thread? Usually fuel line has a compression end on it but I'm not sure about your specific application. If it is a compression fitting the seal takes place between the flared part of the fuel line and the cone of the receiving fitting....not the threads. Putting "suff" on the threads typically won't do any good since the fuel can escape through the center of the nut (between the fuel line and nut).

You might try de-burring the flared end of the fuel line and/or replacing the fitting it screws into (if it is compression).

I seem to be in the minority here but I didn't think we were supposed to use thread sealant on our fuel lines because of the potential of clogging the injectors.

P.O.R.

permatex #2, it is air craft rated and recomended for oil,gas,gasket and a bunch of other stuff..

infidel

I fought leaks on my farm diesel tank for years with everything I could think of till my fuel supplier told me to use Permatex #2. No leaks for over five years now. Teflon tape probably lasted the least amount of time before it dissolved. I now use Permatex #2 on all fuel fittings, always works.

Dufrain

#2 is the non hardening black permatex isnt it.Im pretty sure edelbrock recommends that on part of thier intake gaskets,if you dont use thier brand.

infidel

#2 is more brown than black, real PITA to get it off your hands.

eng208

Thanks, I used No 2 some years ago. Ran out and just never bought anymore, till today, will try it. It seems to be dry right now, but my fuel heater, where the filter screws on, is just a little wet at the seam where it meets the block now. It seems to never end. I will try to fix that in about 800 miles when the filter is due for changing.
Thanks for the advice.
Chris