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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:
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.
Sent:
Wednesday, June 29, 2011 9:56 PM
Subject:
[FlyRotary] GSL393/74028 Fuel Pump Replacement/Fuel Leak
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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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