Teflon tape and gasoline
 

On 3/2/2011 5:41 PM, Gene wrote:
On Tue, 01 Mar 2011 19:59:01 -0500, L wrote:

Google results show differing opinions. Has anyone used Teflon tape
without success on a fuel line thread?

TIA,
Larry
FIRST and FOREMOST.... teflon ONLY works on TAPERED threads. If it
isn't a tapered thread.... forget the teflon (or any other sealant..
fix what is wrong).

There are different formulations of "teflon" for different
applications. For fuel, a "non-white" tape is probably called for.
Don't use the wrong kind. Not all tapes are created equal.

Don't put ANY tape on the first 1-2 threads.

There are semi-liquid thread sealants that are better than the tape.
Globs of pipe dope don't seal better; don't put pipe dope on the first
1-2 threads.





I might be wrong but aren't you supposed to use double flared on metal
fittings? I don't think compression or pipe thread is allowed.

Teflon tape and gasoline
 

Teflon tape and gasoline
 

I_am_Tosk wrote:
In ,
says...

On Wed, 2 Mar 2011 07:09:12 -0500, wrote:


GreaT question. I have always thought teflon tape was impervious to
everything.

It's not, diesel mechanics never use teflon tape for anything because
small pieces of it can break off and clog injectors. They use lliquid
sealants like Permatex or Loctite instead.

I suppose the new Loctite tape is a no-no with Diesels too?

I would not use it downstream of the filters. Liquid sealant is
actually easier to use than tape in my experience. Removal is no
problem if you use the right stuff.

Did the op suggest why he wants to use the "wrong" stuff when the right
stuff is so easy?

The op - me - was unaware of the right stuff. I'm familiar with pipe
dope but I don't keep it around the house and wouldn't have thought it
would be any better.

Teflon tape and gasoline
 

Gene wrote:
On Tue, 01 Mar 2011 19:59:01 -0500, L wrote:


Google results show differing opinions. Has anyone used Teflon tape
without success on a fuel line thread?

TIA,
Larry

FIRST and FOREMOST.... teflon ONLY works on TAPERED threads. If it
isn't a tapered thread.... forget the teflon (or any other sealant..
fix what is wrong).

There are different formulations of "teflon" for different
applications. For fuel, a "non-white" tape is probably called for.
Don't use the wrong kind. Not all tapes are created equal.

Don't put ANY tape on the first 1-2 threads.

There are semi-liquid thread sealants that are better than the tape.
Globs of pipe dope don't seal better; don't put pipe dope on the first
1-2 threads.






They are tapered threads. It is a fuel line with the correct fittings.

Teflon tape and gasoline
 

Boating All Out wrote:
In ,
says...

On Tue, 01 Mar 2011 19:59:01 -0500, L wrote:


Google results show differing opinions. Has anyone used Teflon tape
without success on a fuel line thread?

TIA,
Larry

FIRST and FOREMOST.... teflon ONLY works on TAPERED threads. If it
isn't a tapered thread.... forget the teflon (or any other sealant..
fix what is wrong).


Right. Most gasoline fittings are flared.
Teflon tape is for NPT fittings.



There are different formulations of "teflon" for different
applications. For fuel, a "non-white" tape is probably called for.
Don't use the wrong kind. Not all tapes are created equal.


Right.


Don't put ANY tape on the first 1-2 threads.


Right. And it easier to avoid the first threads with tape than it is
with dope. The argument about using not using tape because it can enter
the line is bogus. Improperly applied dope does the same.


There are semi-liquid thread sealants that are better than the tape.
Globs of pipe dope don't seal better; don't put pipe dope on the first
1-2 threads.

Right. But unless NPT, gasoline fittings will be flared or o-ring.
Neither needs tape or dope.



The fittings I replaced were not flared and the larger, replacement
fittings are also not flared.

Teflon tape and gasoline
 

In article ,
says...

I_am_Tosk wrote:
In ,
says...

On Wed, 2 Mar 2011 07:09:12 -0500, wrote:


GreaT question. I have always thought teflon tape was impervious to
everything.

It's not, diesel mechanics never use teflon tape for anything because
small pieces of it can break off and clog injectors. They use lliquid
sealants like Permatex or Loctite instead.

I suppose the new Loctite tape is a no-no with Diesels too?

I would not use it downstream of the filters. Liquid sealant is
actually easier to use than tape in my experience. Removal is no
problem if you use the right stuff.

Did the op suggest why he wants to use the "wrong" stuff when the right
stuff is so easy?

The op - me - was unaware of the right stuff. I'm familiar with pipe
dope but I don't keep it around the house and wouldn't have thought it
would be any better.

Ahhh, makes sense now.

Teflon tape and gasoline
 

HenryK wrote:
On 3/2/2011 5:41 PM, Gene wrote:
On Tue, 01 Mar 2011 19:59:01 -0500, L wrote:

Google results show differing opinions. Has anyone used Teflon tape
without success on a fuel line thread?

TIA,
Larry
FIRST and FOREMOST.... teflon ONLY works on TAPERED threads. If it
isn't a tapered thread.... forget the teflon (or any other sealant..
fix what is wrong).

There are different formulations of "teflon" for different
applications. For fuel, a "non-white" tape is probably called for.
Don't use the wrong kind. Not all tapes are created equal.

Don't put ANY tape on the first 1-2 threads.

There are semi-liquid thread sealants that are better than the tape.
Globs of pipe dope don't seal better; don't put pipe dope on the first
1-2 threads.





I might be wrong but aren't you supposed to use double flared on metal
fittings? I don't think compression or pipe thread is allowed.
The original Yamaha fittings weren't flared. They also didn't seem to
have any Teflon tape or any other pipe dope on them.

Teflon tape and gasoline
 

Gene wrote:
On Wed, 02 Mar 2011 19:25:54 -0500, wrote:


On 3/2/2011 5:41 PM, Gene wrote:

On Tue, 01 Mar 2011 19:59:01 -0500, L wrote:


Google results show differing opinions. Has anyone used Teflon tape
without success on a fuel line thread?

TIA,
Larry

FIRST and FOREMOST.... teflon ONLY works on TAPERED threads. If it
isn't a tapered thread.... forget the teflon (or any other sealant..
fix what is wrong).

There are different formulations of "teflon" for different
applications. For fuel, a "non-white" tape is probably called for.
Don't use the wrong kind. Not all tapes are created equal.

Don't put ANY tape on the first 1-2 threads.

There are semi-liquid thread sealants that are better than the tape.
Globs of pipe dope don't seal better; don't put pipe dope on the first
1-2 threads.






I might be wrong but aren't you supposed to use double flared on metal
fittings? I don't think compression or pipe thread is allowed.

You will see a lot of tapered pipe threads, AN flares, and SAE
flares.... maybe even a bubble flare!

No compression fittings, but if high pressure (fuel injection), maybe
a double flare...






It is an EFI motor. The fittings are on the fuel/water separator.

Teflon tape and gasoline
 

Teflon tape and gasoline