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Yeah Ed I remember the whole saginaw thing now. It was an odd thread and I could never find the exact fitting at the usual hydraulic supply places. Someone mentioned the 10mmx1.0 working so I tried them and they seemed to work. Funny thing is when I went out tonight no leak, ran the engine up to 3400rpm still no leak( well at least not fuel )...
Thank you everyone for the info on your pumps. I think I am going to try the GSL392's( http://www.summitracing.com/parts/VPN-GSL392/ ) as their spec's call for the 10x1.0 so they should seal without too much problem...
--- On Wed, 6/29/11, Mark Steitle <msteitle@gmail.com> wrote:
From: Mark Steitle <msteitle@gmail.com>
Subject: [FlyRotary] Re:
GSL393/74028 Fuel Pump Replacement/Fuel Leak
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Date: Wednesday, June 29, 2011, 10:30 PM
Hi Scott,
I am using an Aeeromotive fuel pump that looks like the MSD pump Ed uses, except for the MSD label. I did a google search and one popped up for $136.
Mark S.
On Wed, Jun 29, 2011 at 9:20 PM, Ed Anderson <eanderson@carolina.rr.com> wrote:
Hi Scott,
I have used the MDS inline fuel pump (very similar to the
ones Tracy sells). I have used them for over 10 years and never had them
leak. They use (what used to be called "Saginaw fittings - I think because
they were metric and used in Automobile fuel systems" - with the small "O"
ring. In fact, it looks exactly like the summit racing part.
There is always the possibility you got a defective fitting or an
old "O" ring.
Ed
Sent: Wednesday, June 29, 2011 9:56 PM
Subject: [FlyRotary] GSL393/74028 Fuel Pump Replacement/Fuel
Leak
I have inline fuel pumps from Tracy from a while
back. They were from Napa and were the 74028 flavor( http://www.summitracing.com/parts/CRT-P74028/?rtype=10
seems most like them currently ) Tracy used to provide.
The fixed
hose barb side of course does not leak, but on the screw fitting side I
have a 10mmx1.0( http://www.summitracing.com/parts/RUS-670480/
) with an o-ring and everytime I think I have the fuel drip fixed and
start the pump without the engine it doesn't leak. But, after a
short engine run the drip returns.
As I burned out one of
the pumps already( important safety note make sure the fuel selector valve
is not off while you have the pump turned on and are checking for leaks )
and will need to replace it what other inline pumps have folks been
using? The 74028 flavor fuel pumps, the 10mm fits but does not
seal. I did not use thread tape or other thread sealer. And no
amount of tightening seems to keep it from leaking again.
Thoughts
on a fuel pump substitute? Way to seal that fitting to the existing
74028 pump?
Thank
You.
-Scott
http://n820wa.blogspot.com/2011/06/engine-runs.html
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