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View Full Version : DIY adapter 1/8 npt fuel pressure sensor to fuel rail



casias
09-25-2016, 11:30 PM
Not sure how many people have run across this problem, but I thought I would post my solution.

I need to mount a fuel pressure sender on the fuel rail, but no one makes AN4 to 1/8 NPT adapter. The LS dakota got a hobbled up 3-piece adapter that cost way too much money for what it does. So I decided to fabricate my own adapter from a very inexpensive AN4 female to AN4 male pressure port adapter. Initially, I planned on capping the AN4 male end, but it was too long to fit under my engine cover. So I cut it off, tapped it for 1/8 NPT and added a brass plug from Lowes. Now I have the option of straight or 90 mounting location.

LSDAK 3-piece adapter.


http://i1261.photobucket.com/albums/ii596/casias2/IMG_2126_zps365ffphu.jpg (http://s1261.photobucket.com/user/casias2/media/IMG_2126_zps365ffphu.jpg.html)



Started with this.


http://i1261.photobucket.com/albums/ii596/casias2/IMG_2125_zps9nlqwjah.jpg (http://s1261.photobucket.com/user/casias2/media/IMG_2125_zps9nlqwjah.jpg.html)


But it wouldn't fit under my engine cover.


http://i1261.photobucket.com/albums/ii596/casias2/IMG_2124_zpswcqtc5mq.jpg (http://s1261.photobucket.com/user/casias2/media/IMG_2124_zpswcqtc5mq.jpg.html)


Cut the male end off.


http://i1261.photobucket.com/albums/ii596/casias2/IMG_2127_zps8f9jpyoz.jpg (http://s1261.photobucket.com/user/casias2/media/IMG_2127_zps8f9jpyoz.jpg.html)


1/8 tap.


http://i1261.photobucket.com/albums/ii596/casias2/IMG_2128_zpst8bbouln.jpg (http://s1261.photobucket.com/user/casias2/media/IMG_2128_zpst8bbouln.jpg.html)


Drill it out with appropriate size drill bit. In this case, 21/64 drill bit.


http://i1261.photobucket.com/albums/ii596/casias2/IMG_2129_zpsfvopncwh.jpg (http://s1261.photobucket.com/user/casias2/media/IMG_2129_zpsfvopncwh.jpg.html)


Tap, thread in 1/8 brass plug. Done.


http://i1261.photobucket.com/albums/ii596/casias2/IMG_2133_zpse43bhpig.jpg (http://s1261.photobucket.com/user/casias2/media/IMG_2133_zpse43bhpig.jpg.html)

SupaMan86
09-26-2016, 03:01 AM
Racetronix makes the female -4 to female 1/8th npt, they also make the same thing ina swivel 90*

http://www.racetronix.biz/itemdesc.asp?ic=FGAF-418&eq=&Tp=

Have one on my truck, works perfect.

casias
09-26-2016, 06:51 AM
Racetronix makes the female -4 to female 1/8th npt, they also make the same thing ina swivel 90*

http://www.racetronix.biz/itemdesc.asp?ic=FGAF-418&eq=&Tp=

Have one on my truck, works perfect.

Nice to know. Good price too. I searched for a while but didn't see this one.

Edit: No wonder it didn't come up in my search. They have it listed as -4 an MALE to 1/8 FPT. The opposite of how they list every other fitting they sell. Weird.

SupaMan86
09-27-2016, 06:41 AM
Ah true i never caught that, its definitely female tho!

WhiteRT
09-27-2016, 04:59 PM
I would loose the teflon tape on the fuel side. JMO rank amateur opinion. Russell has some really good fuel proof thread sealant I used on everything. I will say you are creative :)

casias
11-02-2016, 10:16 AM
I would loose the teflon tape on the fuel side. JMO rank amateur opinion. Russell has some really good fuel proof thread sealant I used on everything. I will say you are creative :)

How did I miss this post? I will tell you my amateur teflon tape has lasted longer than your full-race fuel lines.

WhiteRT
11-02-2016, 04:58 PM
How did I miss this post? I will tell you my amateur teflon tape has lasted longer than your full-race fuel lines.

I was calling my opinion rank amateur - you know I know nothing, I admit that. And you are stuck on fuel lines. I have no issues now. You should make sure to call all the other people online idiots too. Here is a news flash, I didnt make the fuel lines, Russell did. :jester:

And FWIW I was trying to tell you that the tape may not be the best.

Friggin' R/T
11-02-2016, 05:23 PM
How did I miss this post? I will tell you my amateur teflon tape has lasted longer than your full-race fuel lines.


I was calling my opinion rank amateur - you know I know nothing, I admit that. And you are stuck on fuel lines. I have no issues now. You should make sure to call all the other people online idiots too. Here is a news flash, I didnt make the fuel lines, Russell did. :jester:

And FWIW I was trying to tell you that the tape may not be the best.

Tape looks like shit.:stirringthepot:

slammedR/T
11-02-2016, 08:06 PM
Loctite thread sealant, way better than tape, also tape can break off and clog stuff, just saying.......

casias
11-02-2016, 08:26 PM
I've used tape for at least 20 years. None of the mentioned issues have happened. And it doesn't dry up in the tube.

slammedR/T
11-02-2016, 10:23 PM
I've used tape for at least 20 years. None of the mentioned issues have happened. And it doesn't dry up in the tube.

Loctite thread sealant doesn't dry up in the tube, go tell any of the nitrous companies what you just said, they will laugh you off the phone! I have personally fixed a couple peoples nitrous issue by finding pieces of Teflon tape in they fuel solenoid and yes the nitrous solenoid also.

slammedR/T
11-02-2016, 10:26 PM
http://i240.photobucket.com/albums/ff250/woody2145/PluggedFilter2_zps4a9c2918.jpg

casias
11-02-2016, 11:47 PM
http://i240.photobucket.com/albums/ff250/woody2145/PluggedFilter2_zps4a9c2918.jpg

I can show you thousands of examples of sloppy work. And I can show you how to use something correctly. I am the latter, not the former.

slammedR/T
11-03-2016, 01:06 AM
I can show you thousands of examples of sloppy work. And I can show you how to use something correctly. I am the latter, not the former.

LOL, Ok if you say so, but I can tell you this for fact if you try to argue with Steve Johnson, or Monte Smith, or Steven "fast" Jackson about Teflon tape on nitrous fittings they won't ever talk to you again and they are the baddest nitrous tuners in the country! I see them every once in awhile on yellowbullet have to correct some of these hilljacks wanting to figure their nitrous issues and claiming Teflon tape works just fine......

Lonesoldier79
11-03-2016, 01:25 AM
Don't argue with him. He's using copper pipe and fittings for his coolant feed and return with Teflon tape one the fittings. Don't try to argue the fact on other systems to include nitrous that the properties of what you are trying to seal is corrosive. This hack knows everything and could teach us a thing or two about saving a few dollars while setting ourselves up for failure. " it worked on my junkyard LS build" GTFO already :jester:

BIGROB
11-03-2016, 01:29 AM
:dontfeed:
This is gonna get interesting

slammedR/T
11-03-2016, 01:38 AM
But it is fun to post facts and get poppycock for a reply....... :finger:

BIGROB
11-03-2016, 01:41 AM
But it is fun to post facts and get poppycock for a reply....... :finger:

It's ok. I'm on your side. :jerry:

slammedR/T
11-03-2016, 01:48 AM
Hey, at least I'm keeping it civil, some of you remember how I use to be :gfy:

Lonesoldier79
11-03-2016, 02:04 AM
Hey, at least I'm keeping it civil, some of you remember how I use to be :gfy:

I miss that guy....just sayin'

slammedR/T
11-03-2016, 02:14 AM
I miss that guy....just sayin'

Bro, don't say that..... I been thinking about bringing him back many times...... :fml:

WhiteRT
11-03-2016, 02:36 AM
Lol!!!

casias
11-03-2016, 11:12 AM
LOL, Ok if you say so, but I can tell you this for fact if you try to argue with Steve Johnson, or Monte Smith, or Steven "fast" Jackson about Teflon tape on nitrous fittings they won't ever talk to you again and they are the baddest nitrous tuners in the country! I see them every once in awhile on yellowbullet have to correct some of these hilljacks wanting to figure their nitrous issues and claiming Teflon tape works just fine......

Not sure where you got the idea that that was a nitrous feed. That is a fuel pressure sender.

So tell me, besides name dropping guys that I don't know, and showing me a picture of someone's sloppy work, what exactly is the issue with teflon tape?

casias
11-03-2016, 11:15 AM
Don't argue with him. He's using copper pipe and fittings for his coolant feed and return with Teflon tape one the fittings. Don't try to argue the fact on other systems to include nitrous that the properties of what you are trying to seal is corrosive. This hack knows everything and could teach us a thing or two about saving a few dollars while setting ourselves up for failure. " it worked on my junkyard LS build" GTFO already :jester:

This from a guy that spent how much for something that, what, caught on fire, I think?

Your truck was built by the biggest hack on the planet.

slammedR/T
11-03-2016, 08:36 PM
Not sure where you got the idea that that was a nitrous feed. That is a fuel pressure sender.

So tell me, besides name dropping guys that I don't know, and showing me a picture of someone's sloppy work, what exactly is the issue with teflon tape?

Teflon tape is old out dated plumber technology that has no place on a vehicle in this day and age. Teflon tape can and will break off small pieces and clog things like nitrous solenoids, and oh I don't know FUEL INJECTORS!!!!!!

slammedR/T
11-03-2016, 08:37 PM
I think casias and Arro should get together and build a super engine, just saying......

WhiteRT
11-03-2016, 09:30 PM
Why on gods green earth would you use tape when the paste is superior in every way, shape and form.

casias
11-03-2016, 10:30 PM
Man, I was really hoping someone would claim that is "disintigrates" or "dissolves" in the presence of gas and nitrous.

It does not.

So first, you have to know the story behind why teflon tape is shunned by manufacturers in the automotive aftermarket, and why it is a myth.

If you sell carburetors, fuel injectors, nitrous systems, or fuel systems, you have to know that the vast majority of your customers are morons. They put way too much of everything, and over-tighten the snot out of everything. And when shit doesn't work, they blame the company for a failure. So you have to give them really, really simple instructions.

This is where the idea that "teflon" tape causes stringing and clogging in the fuel system comes into play. "Teflon" tape is not Teflon at all. That is a brand name. It is PTFE film. When most people grab a roll to wrap some threads, they go around about 6 times, right up to the tip of the threads. This film gets squished into the line, and causes strings and clogs.

How about contact with nitrous oxide? A study was conducted in 2010 that showed significant changes to PTFE valve seats exposed to nitrous oxide above 150 psi. But below that, it worked just fine. So don't use any ptfe in any line that is above 150 psi for any length of time. http://www.aptech-online.com/PDF/Technical_Briefs/Test_Reports/30016497rev2.pdf

What is thread sealant? It is PTFE paste. The reason it is user friendly, and heavily encouraged by manufacturers, is that any that might get squished in, and it does, will travel thought the system and not clog it, usually.

So, here is a tutorial.

A length of PTFE tape soaking in my lawn mower gas tank for 48 hours.

http://i1261.photobucket.com/albums/ii596/casias2/IMG_2188_zpsowzwatl7.jpg (http://s1261.photobucket.com/user/casias2/media/IMG_2188_zpsowzwatl7.jpg.html)


http://i1261.photobucket.com/albums/ii596/casias2/IMG_2189_zps2bddfyer.jpg (http://s1261.photobucket.com/user/casias2/media/IMG_2189_zps2bddfyer.jpg.html)

And 5 minutes later after it is dry. Going to wrap this 1/8 npt nipple and thread it into a Barry Grant y adapter.


http://i1261.photobucket.com/albums/ii596/casias2/IMG_2190_zpsbbxxdwsu.jpg (http://s1261.photobucket.com/user/casias2/media/IMG_2190_zpsbbxxdwsu.jpg.html)


Properly wrapped ptfe film on fitting. 2 threads are exposed, single layer of film.


http://i1261.photobucket.com/albums/ii596/casias2/IMG_2191_zpsgitwtf7a.jpg (http://s1261.photobucket.com/user/casias2/media/IMG_2191_zpsgitwtf7a.jpg.html)

Threaded in. Just to snug. If it leaks a little, tighten it a little more. If it is in a difficult spot after installation, pressure test it first.


http://i1261.photobucket.com/albums/ii596/casias2/IMG_2192_zpsnrtcel1x.jpg (http://s1261.photobucket.com/user/casias2/media/IMG_2192_zpsnrtcel1x.jpg.html)


I couldn't get a good picture, but the threads don't actually protrude into the body of the adapter. As it should be.


http://i1261.photobucket.com/albums/ii596/casias2/IMG_2193_zpsfncovsdc.jpg (http://s1261.photobucket.com/user/casias2/media/IMG_2193_zpsfncovsdc.jpg.html)

And this is what it looks like when the fitting comes out. No chance of any ptfe film getting into the fuel system at all.

http://i1261.photobucket.com/albums/ii596/casias2/IMG_2196_zpscjelb83n.jpg (http://s1261.photobucket.com/user/casias2/media/IMG_2196_zpscjelb83n.jpg.html)

How a sloppy mechanic uses ptfe film. And the reason why their shit doesn't run.

http://i1261.photobucket.com/albums/ii596/casias2/IMG_2195_zpslasbmanb.jpg (http://s1261.photobucket.com/user/casias2/media/IMG_2195_zpslasbmanb.jpg.html)


Oh. And I lied. I have ptfe thread sealant. I just don't use it all the time, because ptfe film is superior most of the time.

http://i1261.photobucket.com/albums/ii596/casias2/IMG_2194_zps2oxu3tdx.jpg (http://s1261.photobucket.com/user/casias2/media/IMG_2194_zps2oxu3tdx.jpg.html)

Permatex thread sealant IS ptfe.


http://i1261.photobucket.com/albums/ii596/casias2/Permatex%20thead%20sealant_zpsutgifev6.jpg (http://s1261.photobucket.com/user/casias2/media/Permatex%20thead%20sealant_zpsutgifev6.jpg.html)

http://i1261.photobucket.com/albums/ii596/casias2/Permatex%20thead%20sealant_zpsutgifev6.jpg (http://s1261.photobucket.com/user/casias2/media/Permatex%20thead%20sealant_zpsutgifev6.jpg.html)

slammedR/T
11-03-2016, 10:35 PM
LOL, why would ptfe dissolve in gasoline?

casias
11-03-2016, 10:37 PM
LOL, why would ptfe dissolve in gasoline?

Dunno. That's what most internet experts claim.

Adobedude
11-03-2016, 11:02 PM
Good grief....Tape is fine if you use it correctly, I use it, fuck that pipe dope crap.

Lonesoldier79
11-04-2016, 12:21 AM
This from a guy that spent how much for something that, what, caught on fire, I think?

Your truck was built by the biggest hack on the planet.

You're right I had a circuit ground out to the chassis because it wasn't insulated properly, but I was able to hit the kill switch in time before any significant damage could happen and had it fixed the next day. That work wasn't done by Chris, but by one of his guys Mike. It still falls back on Chris, but I wouldn't call him a hack. And yeah my truck is still faster than yours :nana:

Adobedude
11-04-2016, 12:29 AM
11.39@117 ?

:secret squirrel:

Lonesoldier79
11-04-2016, 01:09 AM
11.39@117 ?

:secret squirrel:

I know right :fml: Trans is finally working the way it should just need to get on a drag strip again as soon as possible.

WhiteRT
11-04-2016, 03:41 AM
Good grief....Tape is fine if you use it correctly, I use it, fuck that pipe dope crap.

Who said anything about pipe dope? Talking about thread sealant specific for gasoline applications. It just plain works, you know, new technology.

Jeezus do you guys use a crescent wrench for all your bolts too?

I dont see the harm in recommending a better method even over one that probably works with the correct application technique.

wow.

casias
11-04-2016, 10:56 AM
It still falls back on Chris, but I wouldn't call him a hack. And yeah my truck is still faster than yours :nana:

Well shit, it should be. Considering I have a bone-stock 6.0 with a cam.



Who said anything about pipe dope? Talking about thread sealant specific for gasoline applications. It just plain works, you know, new technology.

Jeezus do you guys use a crescent wrench for all your bolts too?

I dont see the harm in recommending a better method even over one that probably works with the correct application technique.

wow.

Yes. PTFE thread sealant is new technology. Straight from 1938. PTFE film is superior, if used correctly. You, my friend, are the customer the companies fear.

WhiteRT
11-04-2016, 01:44 PM
Well shit, it should be. Considering I have a bone-stock 6.0 with a cam.




Yes. PTFE thread sealant is new technology. Straight from 1938. PTFE film is superior, if used correctly. You, my friend, are the customer the companies fear.

Don't forget to call just about every major builder in the country an idiot that use and recommend SPECIFIC thread sealant designed for the application.

You my friend are the customer companies DONT WANT!!!

Sick 660r
11-04-2016, 03:56 PM
Bro, don't say that..... I been thinking about bringing him back many times...... :fml:

You bipolar fuck

casias
11-04-2016, 08:07 PM
You my friend are the customer companies DONT WANT!!!

And you are the idiot who believes them.


Edit: Guess it would blow your mind if I told you that NPT is a TAPERED thread, and shouldn't need any kind of sealant if it was precise enough. The ptfe, film or paste, is actually a friction modifier, more than anything else.