1g fuel rail tap size?(afpr setup)

laserburnt' · 03-03-2008, 07:08 PM

I have done the search and at least found a couple of answers, but the reality is i need a straight answer for the following...
Tap size for the fuel rail to put in a -6 an fitting, which is what i intend to run to and from the rail.
Aeromotive regulator 13109.
I intend to run the regulator right from a 90 cast angle from the rail, but refuse to pay the almighty dollar for the conversion fitting.
Findings on the search include one member using a 3/4npt/-6an fitting(only available in straight), and another person using a 3/8npt/-6an. WTH? HUGE DIFFERENCE IN SIZE!!!
Any clarification would greatly be appreciated!!!
Thankx

laserburnt' · 03-04-2008, 08:30 PM

bump......WISEMAN?..........

absolute_DSM · 03-04-2008, 08:52 PM

Ugh, this isnt a Honda forum, dont bump your post. If Defiant sees this consider it closed.

I easily use a M18x1.5 tap with a M18 to -6 or -8 AN adapter fitting.

92awddsm · 03-04-2008, 09:01 PM

I use a 3/8 npt tap and used a 3/8 to-8 fitting. The same is available for -6 also.

Pass side Earl's Performance 982366ERL - Earl's Performance AN to NPT Adapter Fittings - summitracing.com

Driver side to regulator Summit SUM-220652 - Summit AN to NPT Adapter Fittings - summitracing.com

I didnt go the metric route because they usually arent readily available like the npt type fittings.

boosting_laser · 03-04-2008, 09:12 PM

I tapped my rail with a 3/4"-16 tap.

Fittings:

-6 w/ o-ring

-6 90* w/ o-ring

absolute_DSM · 03-04-2008, 09:12 PM

^ True. I use ANplumbing for all Earl fittings and they are great to deal with. They have never caused me any problems or not been able to get a part for me.

Plus with NPT fittings you wouldnt need the aluminum crush washers

Ill have to remember that.

92awddsm · 03-04-2008, 09:22 PM

Quote:

Originally Posted by boosting_laser

I tapped my rail with a 3/4"-16 tap.

Fittings:

-6 w/ o-ring

-6 90* w/ o-ring

Why does the 90* fitting have left hand threads? I think that may be the wrong part #.

Another advantage to using npt as opposed to metric or sae straight threads is oreintation of angled fittings when tight. With o-rings or crush washers, once it is tight, it is tight. If it is a 90* fitting and pointed 180* opposite of what it needs to be, the only remedy is to start indexing (stacking crush washers or o-rings until it points to where it needs to) which is prone to leak. With npt fittings, once tight, you should have at least120* of adjustment tighter to get the optimal oreintation of the fitting.

absolute_DSM · 03-04-2008, 09:33 PM

Quote:

Originally Posted by 92awddsm

Another advantage to using npt as opposed to metric or sae straight threads is oreintation of angled fittings when tight. With o-rings or crush washers, once it is tight, it is tight. If it is a 90* fitting and pointed 180* opposite of what it needs to be, the only remedy is to start indexing (stacking crush washers or o-rings until it points to where it needs to) which is prone to leak. With npt fittings, once tight, you should have at least120* of adjustment tighter to get the optimal oreintation of the fitting.

Well put. It may cost more, but I use straight AN adapters, then 90* swivels.

Ill learn how to save money eventually.

laserburnt' · 03-05-2008, 02:00 PM

Sorry for the bump, but................

Thankx for the info fellaz!!! Feel free to add more, as I said this (old-previous)info is a little skechy!

Also, is there enough room on the driver's side to run a 3/8-6an staight fitting and a -6an 90* with swivels without hitting the covers? Any pics?

EricR287 · 03-17-2008, 06:40 PM

A few months ago I tapped an extra fuel rail for 3/8" npt and I'm using 3/8 to -6 an fittings from earl's. I just installed it yesterday along with an AFPR. I've tried twice now (removing and tightening) to get the NPT side of the adapter to NOT LEAK. The second time I really cranked on the fuel rail while using a screwdriver thru one of the 3 mounting holes along with keeping the rail portion held in a bench vice. This worked better than the first time, but I still have an extremely slight leak. At this point I'm tempted to jb weld the threads...

Any suggestions? Any one else have these problems? Should I not use teflon tape?

92awddsm · 03-17-2008, 07:11 PM

Quote:

Originally Posted by EricR287

A few months ago I tapped an extra fuel rail for 3/8" npt and I'm using 3/8 to -6 an fittings from earl's. I just installed it yesterday along with an AFPR. I've tried twice now (removing and tightening) to get the NPT side of the adapter to NOT LEAK. The second time I really cranked on the fuel rail while using a screwdriver thru one of the 3 mounting holes along with keeping the rail portion held in a bench vice. This worked better than the first time, but I still have an extremely slight leak. At this point I'm tempted to jb weld the threads...

Any suggestions? Any one else have these problems? Should I not use teflon tape?

You have to use a fuel safe sealer or tape. All tapered pipe threads need some sort of seler on them.

EricR287 · 03-17-2008, 07:42 PM

I bet it's the home plumbing kind of teflon tape I'm using. I didn't realize it would make a difference. Thanks!

Edit: after searching around I found that loctite 567 is supposed to work very well.