FYI - the manufacturers manual (Aeroquip / Earls) specifically mentions NO sealant or tape should be used for assembly of aluminum fittings! They should go together bare. You can't over-torque them if you use their short aluminum wrenches. Just be gentle - they won't leak. They are rated for over 2,000 psi in aircraft applications. If you have trouble taking them apart, they were over-torqued when they were installed.

Pipe fittings? Don't know when used in auto fuel systems. Plumbers use tape or tfe dope...probably OK here too since most of the fuel systems are teflon lined.

 

They are not pipe fittings just pipe threads on the nipples that go into the fuel filter, fuel rails and fuel pump. Interesting they do not recomend anything.

 

They do recommend something - they recommend using nothing. I think you meant "Interesting that they recommend using nothing on the fittings."

 

The aeroquip fittings are assembled dry but pipe thread fittings need something. I used teflon tape on my first tripower setup. Ended up with slivers of tape in all the orfices in the carbs and problems. Used TFE paste after I disassembled and cleaned the tape shards out and had no issues. Used TFE paste on this one and had no issues. My tripower setup has 10 pipe thread fittings and 6 compression fittings on the fuel lines from the block to the float bowls. No leaks and no clogging issues like the tape. I also put a thin coat of TFE paste on the compression rings when assembling. Just my personal experiance.

 

WOW, I've done this stuff on multi-BILLION $$ military aircraft, and we had all kinds of cheap teflon tape and paste to use.......


OH, and I think I can still quote anyone I want to, reading the post or not.

 

Is that like "Yes, we have no bananas..."?

Are you sure they are pipe threads? All the filters and pumps I've seen for cars usually have AN fittings. (Not trying to be funny, but sometimes it's hard to tell and you could screw up the threads if they are mismatched).

 

Here is a fuel rail and the fuel filter I did last night. These are 3/8 pipe threads with teflon tape. 2 wrap arounds, install and tighten fittings then I took a razor and cleaned off the outer part of the tape so it looks better. Yes the other end is an AN fitting but the rails and inlet/outlet of the filter are pipe threads.

 

What color tape did you use ?

 

Only had white. I can take it apart and put in the yellow if you think that would help.

 

I had white tape dissolve in the gas and clog my filter. Have since switched to all AN hose & fittings, no sealant or lube as Z-man says.

 

Take it apart and put the yellow tape on, put the white stuff in gas and see what happens

 

Psst. White is yellow is green. Teflon tape is PTFE, Or Polytetraflouroethaylene. It is only color coded per application by code. In other words, it's the same stuff.

 

Psst your wrong, or should I say you are right. It is color coded for application and the yellow stuff doesn't disintegrate in gas

Read the part where it says" It's specifically designed to handle oil and chemicals"

Jeesh I can't believe the bs over a simple question asked by the OP

http://www.utahbiodieselsupply.com/teflontape.php

http://www.fdsons.com/yellow-line-te...3-p-51991.html

"It's for hydraulics and other petrol-based applications.

Airhead petcocks are famous for leaking. The white standard teflon tape won't work. The yellow stuff will.

It's been gasoline proof on my airhead for well over a year."

Can we put this one to bed now ?

 

Here some interesting reading on teflon tape. Seems it is all the same stuff.

Thread seal tape — commonly known as "Teflon tape", "PTFE tape" or "plumber's tape" — is a polytetrafluoroethylene (PTFE) film cut to specified widths for use in sealing pipe threads. The tape is wrapped around the exposed threads of a pipe before it is screwed into place. Since the PTFE is malleable, deformable and impermeable, it acts a little like putty under compression, being forced into small gaps between threads in order to create an air- and watertight seal when threaded into a joint. The tape is commonly used commercially in pressurized water systems, such as central heating systems, as well as in air compression equipment and thread joints with coarse threads.

One of the defining characteristics of PTFE is how good it is at defeating friction. The use of PTFE tape in tapered pipe threads performs a lubricating function, which more easily allows the threads to be screwed together, to the point of deformation, which is what creates the majority, if not all, of the seal.

Thread seal tape is most commonly a white film (the natural color of PTFE) and is used in plumbing applications, but it is also available in various colors. While pigmented thread seal tape is not materially different from the natural white tape, it is often used to correspond to color coded pipelines (yellow for natural gas, green for oxygen, etc.).

There are two standards for determining the quality of any PTFE tape. MIL-T-27730A (an obsolete military specification still commonly used in industry in the US) requires a minimum thickness of 3 mils. The second standard, A-A-58092, is a commercial grade which maintains the thickness requirement of MIL-T-27730A and adds a minimum density of 1.2 g/cc.[citation needed]


A little more info'

When PTFE (Teflon) tape first became available they only made it in the common single density type, which we commonly find in the hardware and home supply stores. Later they began making a double density version, which was twice as thick. Many state and local codes then adopted the double density type as mandatory when making connections for natural gas however since both products were the same color (white) it was difficult for inspectors to be sure which product had been used. PTFE tape is now made in numerous varieties and they have issued a color standard to determine which type should be used.

WHITE-Single density- should only be used on NPT threads up to 3/8 inch.
YELLOW- Double Density- yellow double density is often labeled as "Gas type"
RED-Triple Density: (Note-the container is red but the tape itself appears as a pale pink color). Presently required on all joints ½" diameter or greater.
GREEN- Oil Free PTFE tape- Required for use on all lines conveying oxygen (I.E. –medical oxygen or welding oxygen lines).
COPPER COLOR- contains granules of copper and is to be used as a thread lubricant but is not approved as a thread sealant. (Generally it is used as a thread lubricant on bolts or pipe threads for mechanical applications where no physical seal is required.)

 

Just use the white stuff it will work fine

 

http://www.highsidechem.com/lklcksp.html

Leak Lock paste is the stuff to use. I do this stuff for a living every single day of the week and this Leak Lock product will seal threads up without leaks. I have seen fittings with Leak Lock that were screwed together hand tight and never tightened then had caustic soda ran through them for years without any leaks. This stuff works with everything and there is no chemical or product (air/steam/gas/fuel/chemical etc.) that I have found yet that will eat through it. No tape, just some Leak Lock, tighten it down, then wipe off the excess before it dries and you'll be good.


-Justin

 

Sure. I just feel the correction was necessary. I liken it to gray duct tape is stronger than black.

 

Sounds like "Expando." That stuff is unreal, but you can't take it apart again.

 

You can use the white stuff on gas leaks too

 

Now that you guys have the teflon stuff all figured out, why don't you just use the proper pipe thread with no sealer, designed for the job and be done with it.

There are at least 6 types of pipe thread and NPT is only one of them and not designed for pressurized fuel.

For pressurized fluids especially fuel NPTF Dryseal or above.

NPTF - Dryseal American Standard Taper Pipe Threads

Applicable Standards

* SAE J476 DRYSEAL PIPE THREADS
* ANSI B1.20.3 DRYSEAL PIPE THREADS (INCH)
* FED-STD-H28/8 SCREW-THREAD STANDARDS FOR FEDERAL SERVICES
SECTION 8 DRYSEAL PIPE THREADS