[Diy_efi] GM TPI fuel lines/rails and Saginaw fittings

[Dave Dahlgren]

YES
you can machine the metric fitting for the o-ring.. Simpler is to call Kinsler
fuel injecdtion and just buy one though.
Dave

"Marteney, Steve" wrote:
> 
> FWIW - I think I solved my own problem, but all I have is logic and little
> bit of research, but nothing that says this is what it is.  It appears the
> 5/16" Saginaw is the same thing as a 14mm x 1.5 Saginaw as well as a 3/8"
> Saginaw being the same as a 16mm x 1.5.  After doing some research, I
> reconcile that the 5/16 and 3/8 nomenclature is a lot like the AN -X
> nomenclature.  A -6AN fitting really doesn't specify anything except the max
> O.D. of the hose/line (6/16 of an inch).  Likewise, in the Saginaw
> nomenclature, 3/8" specifies the O.D. of the incoming hose/line since no
> part of the thread dimensions comes anywhere close to 5/16".
> 
> Now, the Saginaw fittings are also specified as M16 x 1.5 metric fittings
> (or M14).  According to the Machinist's Handbook, the M nomenclature
> indicates an M16 would have a 16mm major diameter, where major diamter, in
> millimeters, is majored from outer thread to outer thread on a male type
> fitting.  The x 1.5 indicates the thread pitch, distance from one thread
> peak to an adjacent thread peak, also in millimeters.  Some rough caliper
> measurements seem to confirm this.
> 
> Furthermore, which most everyone knows, the Saginaw fitting has an o-ring at
> the tip of the male fitting and a mating recess in the female fitting.
> 
> Am I on track?
> Steve
> 
> -----Original Message-----
> From: Marteney, Steve [mailto:Steve_Marteney at drsoptronics.com]
> Sent: Tuesday, September 17, 2002 1:53 PM
> To: 'diy_efi at diy-efi.org'
> Subject: [Diy_efi] GM TPI fuel lines/rails and Saginaw fittings
> 
> Sorry for being slightly off-topic, but I'm building a custom EFI system for
> a Firebird that currently has GM TPI injection (350-V8).  I have come across
> some conflicting stories with regard to fuel line fittings and adapters.  I
> am told the existing fuel lines coming in (one feed, one return) are Saginaw
> fittings, specifically 16mm x 1.5 and 14mm x 1.5.  Now, I also see other
> data (specifically from Accel) where they sell an adpater kit that contains
> 5/16" and 3/8" fittings.  Anybody know which is correct, or are these the
> same things?
> 
> Related, I am looking for a 5/16" Saginaw (male) to -6AN male adapter.  I
> know Accel sells the 74730 kit that has both 3/8 and 5/16, but I don't want
> the 3/8 fitting and I definitely don't want to pay $30 for both.  I have
> looked at ANPlumbing.com, Earl's, and Russell (forgot Aeroquip) but have
> found nothing.  Anybody know a source for these fittings beside Accel?  As a
> knock against Accel, their 74560 rail-mount adjustable fuel pressure
> regulator comes with a female 5/16" Saginaw as the return port and they ONLY
> sell the two fittings together, which I find stupid.
> 
> Thanks for the help,
> Steve Marteney
> 
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