flyrotary@lancaironline.net Mailing List Archive

Dean;

Not questioning that your pumps have 5/16 – 24 threads, just mentioning that Tracy also provided pumps with 10-1 metric threaded barb fittings. We know he has sold different pumps, and I’m sure manufacturers provide both metric and British measures.

The 10 – 1 metric to AN-6 adapter is a standard carburetor fitting. I think Earl’s has them, and perhaps also Baker precision.

Subject: [FlyRotary] Re: Fittings for Tracys Fuel Pumps Was Re: Fuel Filter Part Number

Al, Mark, and Scott

The pumps that I received from Tracy had a fixed 5/16 hose barb on the inlet and a 5/16-24 threaded brass hose barb for the outlet. A 5/16-24 bolt was a perfect fit in the outlet. A 10MMx1.0 bolt would not even start to engage the threads in the pump because the max thread dia was too large and the matching metric nut was sloppy on the brass hose barb. The US thread pitch was 24/inch and the metric 1.0 is 25.4/inch. With the 991953 fitting only engaging approx 5/16 inch, and the metric thread being a larger diameter, I felt that I would have sufficient good thread engagement for a sound joint. Perhaps I overlooked it in the Pegasus catalog, but I was unable to find an AN6 to 10-1 metric fitting there. I have purchased other AN fittings there as well as ready made cross-over brake hoses with metallic braid for my dual brake installation to replace Van's plastic lines. I think that my experience just shows, once again, the variation in pumps supplied by the National Aviation Parts Association (:>)}. I am installing Earl's HP 35 micron bronze fuel filters (obtained from Wicks) down stream of the pumps and coupling them with AN6 to AN6 Female Swivel Couplings from Pegasus.

Dean

----- Original Message -----

From: Al Gietzen

To: Rotary motors in aircraft

Sent: Tuesday, August 03, 2004 9:11 AM

Subject: [FlyRotary] Re: Fittings for Tracys Fuel Pumps Was Re: Fuel Filter Part Number

The pumps I got from Tracy had 10-1 metric threads, both ends.

Al

Subject: [FlyRotary] Re: Fittings for Tracys Fuel Pumps Was Re: Fuel Filter Part Number

Dean,
I may be wrong here, but I believe the threads are metric... 10mm if I'm correct. It is very close to the 5/16-24, but not a perfect fit. They sell a 10mm x 1.0 to AN adapter. See: http://www.pegasusautoracing.com/pdfs/069.pdf

Mark

At 09:20 PM 8/2/2004 -0500, you wrote:

Mark and Scott

The NAPA pumps that I purchased from Tracy were marked Carter 2H26A380 and
the screw in barb adapter was a 5/16-24 thread. I was unable to find any
source of 5/16 to AN6 adapters. I obtained the Earl's 991953 fittings which
came with soft aluminum seal washers. Using a 23/64 drill and both standard
and bottoming 10mm-1.0 taps, I was able to cut several almost complete
threads to match the Earl's fittings. After removing any trace of cuttings
and carefully smoothing the pump face, I installed the fittings using the
aluminum washers and fuel lube on the threads. They torqued up well but I
haven't had a chance to leak check them yet.

Dean Van Winkle
RV-9A Fuselage/Finish '89 13B NA, RD-1B, EC2, EM2

----- Original Message -----
From: "marc" <cardmarc@charter.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Thursday, July 29, 2004 6:53 PM
Subject: [FlyRotary] Re: Fittings for Tracys Fuel Pumps Was Re: Fuel Filter
Part Number

> I've always wondered why almost ALL cars never use AN fittings and their
> fuel lines seldom leak. Somehow, with the number of cars on the road
> that are fi, I think AN fuel lines are a waste, (if you do it right,
> using the right clamps and lines!).
>
> Marc Wiese
>
>
> > -----Original Message-----
> > From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
> On
> > Behalf Of Scott
> > Sent: Thursday, July 29, 2004 6:41 PM
> > To: Rotary motors in aircraft
> > Subject: [FlyRotary] Re: Fittings for Tracys Fuel Pumps Was Re: Fuel
> > Filter Part Number
> >
> > >> <snip>
> > >>I have Tracy's fuel pumps as well, and I have a note
> > that says the fittings to convert those to
> > >>AN-6 are Earl's 991953. These are metric 10mm x
> > 1.0P to AN-6.
> >
> > I too purchased Tracy's pumps. The one's sent came
> > from NAPA marked as 3f27a380 purchased from Tracy in
> > November 2003. The screw in barb adapter on the high
> > pressure side of the pump is 3/8" with 24TPI.
> >
> > Though oddly enough the ID of the tube is 7/32. Not
> > 1/4 and not 3/16. Interesting...
> >
> > Regards...
> > -Scott
> >
> >
> >
> >
> >
> >
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