need to end a debate

[bkusa_2]

when instaling threaded fuel fittings can you use teflon pipe tape or must you use a pipe dope ? we have 2 schools of thought around here 2 different shops both say different ..........my partner and i just want the best seal

 

[clanton]

Re: need to end a debate

One of the common hyd pump thats fit on side of transmission in some dump trucks, comes with tag, that says if you use telfon tape warranty is void.<br />The pump inlet threads are tapered pipe threads, very easy to crack the pump housing, because there is no resistance on the threads, when tighting, and using telfon tape.

 

[B_Eager]

Re: need to end a debate

Dealt with both kinds for the last 20 years. First like the gentlman above, you have tapered thread, so you should not need it at all. The goop as I call it, I would not use on anything to do with fuel. One glob in the wrong spot and you could have a mess at just the wrong time. Me, I prefer the tape, one and a half loops around to two and a half. Just remember you are only using the tape for lubrication, not sealing!

 

[bkusa_2]

Re: need to end a debate

hummm interesting 1 for 1 against ........even money so far ........wave we did have a shop owner site no goop for same reasion............anyone if you read this post add your 2 cents worth interested in the out come of this long debate we have had

 

[Ralph 123]

Re: need to end a debate

Sounds like Wave ended the debate. You can't take a chance that the dope will get into the fuel system and foul it.... that's my 2

 

[Bondo]

Re: need to end a debate

Pipe dope, Tape, Silicone,etc.... they all have their place,+ Should be used Sparingly.... I've seen brand new engines turn to Junk in a matter of Minutes, by a mechanic who thought, If a little is good, Alot Must be Better......<br /> Stray Silicone in the Oil Pump.....<br /><br />I use pipe dope on oil/fuel pipe threads....<br />And tape on water/other fluid fittings.....<br /><br />Diesel fuel,+ several other petrolchemicals will desolve teflon tape......

 

[jdkzrt]

Re: need to end a debate

I am not aware of any fuel line fittings (brass or steel) that need tape or goop to seal.

 

[walleyehed]

Re: need to end a debate

Pipe dope is the only excepted method in aviation, and the tape is a BAD no-no...too many times a piece of the tape somehow gets into the system rather it be fuel or hydr. system.<br /> Anytime you install pipe type fittings-metal to metal, Always use pipe dope of some sort to avoid gaulding when installing, sealer while in place and anti-sieze when it comes apart.<br />Aircraft advisory circular, 43-13, 1A, thru 2B, excepted methods and practices.

 

[eurolarva]

Re: need to end a debate

Not sure how this works in the boat enviornment but in the home there are two types of teflon tape. You are not suppose to use the white on gas lines(LP Gas) you are suppose to use the yellow. The lp gas will deterioate the white tape causing it to leak when you least expect it to. Not sure if this is true for gasoline.

 

[Ralph 123]

Re: need to end a debate

walleyehed does the advisory discuss the need and/or methods to keep the dope from fouling the system? It just seems that a paste would be more likely to enter the system than a tape...Juts curious...

 

[magster65]

Re: need to end a debate

We have 2 different kinds of t-tape, one is for water and the other for petroleum products but I don't recall any fuel fittings on my boat that require any sealer.

 

[walleyehed]

Re: need to end a debate

That part is left to common sense. the first thread or 2 doesn't need sealer, or dope, so you don't glob it over the end.<br /> Also, you NEVER put metal to metal together without thread dope, I don't care what you are working on........

 

[catfish1]

Re: need to end a debate

i like tape! on everything. if i use dope it goes over the tape.(steam pipe)

 

[walleyehed]

Re: need to end a debate

And To think I was secretly looking thru my prop stash for a wheel that would work for you catfish!!!!!!!!!!! <br />I'm still lookin'........

 

[catfish1]

Re: need to end a debate

walleyehed, that would be awesome. man you are one cool cat!

 

[akriverrat]

Re: need to end a debate

eurolarva, yellow tape is allways safe for lpg, ng. required to be used in some areas so inspectors can visually verify that the tape is approved for that use. many white tapes are also safe for lpg but you can't tell by just looking. you have to read the label. same with pipe dope. walleyedhed, the first 2 threads left bare is accepted practice, but aluminum to brass or steel will sometimes "weld" to those bare bottom 2 threads and destroy the aluminum threads when they joint is dis-assembled. a VERY light coat of dope will seal and act as anti-seize without contaminating your fuel system. the thread seal pastes that i use, the carrier will disolve in petroleum products and be carried harmlessly away. the solids are small enough to not present a problem in carbs unless you end up with gobs of it in the system. pipe joints assembled dry probably all leak but at a slow enough rate that the gasoline evaporates befor its visible as a wetted area. liquid lpg can't be contained by bare tapered pipe threads at even very low system pressure and i doubt gasoline can either.