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

[Marteney, Steve]

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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