X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from willowsprings.uwyo.edu ([129.72.10.31] verified) by logan.com (CommuniGate Pro SMTP 5.4.0) with ESMTPS id 5039175 for flyrotary@lancaironline.net; Fri, 01 Jul 2011 01:04:42 -0400 Received-SPF: none receiver=logan.com; client-ip=129.72.10.31; envelope-from=SBoese@uwyo.edu Received: from ponyexpress-ht3.uwyo.edu (extlb.uwyo.edu [172.26.4.4]) by willowsprings.uwyo.edu (8.14.4/8.14.4) with ESMTP id p6153vgv003180 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL) for ; Thu, 30 Jun 2011 23:04:04 -0600 (MDT) (envelope-from SBoese@uwyo.edu) Received: from ponyexpress-m10.uwyo.edu ([fe80::60dd:cb9e:6f71:3d48]) by ponyexpress-ht3.uwyo.edu ([fe80::dc63:d646:8a62:d32f%13]) with mapi id 14.01.0289.001; Thu, 30 Jun 2011 23:03:57 -0600 From: "Steven W. Boese" To: Rotary motors in aircraft Subject: RE: [FlyRotary] Re: GSL393/74028 Fuel Pump Replacement/Fuel Leak Thread-Topic: [FlyRotary] Re: GSL393/74028 Fuel Pump Replacement/Fuel Leak Thread-Index: AQHMN5BdI/sEsWmiY02G5nviM1i+5pTW5Ggm Date: Fri, 1 Jul 2011 05:03:56 +0000 Message-ID: <3E8191F276108F4481AB0721BBA9269E05814561@ponyexpress-m10.uwyo.edu> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [75.220.193.78] Content-Type: multipart/alternative; boundary="_000_3E8191F276108F4481AB0721BBA9269E05814561ponyexpressm10u_" MIME-Version: 1.0 --_000_3E8191F276108F4481AB0721BBA9269E05814561ponyexpressm10u_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Scott, I have used the pumps with the 10mmx1.0 connection without leak problems. = I use a soft aluminum or soft copper crush washer between the pump and fitt= ing, not a rubber o-ring. The mating surfaces should be square and smooth = and could be retooled in a lathe if needed. The thread is a straight threa= d, not tapered, so it doesn't seem like trying to seal the joint in the thr= eads with tape or other sealant would work very well. Steve Boese From: Scott Sent: Wednesday, June 29, 2011 9:56 PM To: Rotary motors in aircraft 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/?r= type=3D10 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/ ) wit= h 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 t= he 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 h= ave 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 existi= ng 74028 pump? Thank You. -Scott http://n820wa.blogspot.com/2011/06/engine-runs.html -----Inline Attachment Follows----- -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.= html --_000_3E8191F276108F4481AB0721BBA9269E05814561ponyexpressm10u_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Scott,

I have used the pumps with the 10mmx1.0 connection without leak problems= . I use a soft aluminum or soft copper crush washer between the pump = and fitting, not a rubber o-ring. The mating surfaces should be squar= e and smooth and could be retooled in a lathe if needed. The thread is a straight thread, not tapered, so it = doesn't seem like trying to seal the joint in the threads with tape or othe= r sealant would work very well.

Steve Boese

From: Scott

Sent: Wednesday, June 29, 2011 9:56 PM

To: Rotary motors in aircraft

Subject: [FlyRotary] GSL393/74028 Fuel Pump Replacement/Fuel Le= ak

I have inline fuel pumps from Tracy from a while back.&n= bsp; They were from Napa and were the 74028 flavor( http://www.summitracing.com/parts/CRT-P74028/?rtype=3D10 seems most lik= e 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 ever= ytime I think I have the fuel drip fixed and start the pump without the eng= ine it doesn't leak. But, after a short engine run the drip returns.&= nbsp;

As I burned out one of the pumps already( important safety note make sure t= he 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 h= ave folks been using? The 74028 flavor fuel pumps, the 10mm fits but does not seal. I did not use th= read tape or other thread sealer. And no amount of tightening seems t= o keep it from leaking again.

Thoughts on a fuel pump substitute? Way to seal that fitting to the e= xisting 74028 pump?

Thank You.
-Scott
http://n820wa.blogspot.com/2011/06/engine-runs.html=

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