X-Virus-Scanned: clean according to Sophos on Logan.com From: "Bobby J. Hughes" Received: from [207.91.159.28] (HELO barracuda.qnsi.net) by logan.com (CommuniGate Pro SMTP 6.2c1) with ESMTP id 9580499 for flyrotary@lancaironline.net; Fri, 17 Mar 2017 14:25:49 -0400 Received-SPF: pass receiver=logan.com; client-ip=207.91.159.28; envelope-from=btv1==2493c51bc5f==bhughes@qnsi.net X-ASG-Debug-ID: 1489774899-0276454677194560001-fw4j19 Received: from mail.qnsi.net ([10.0.0.5]) by barracuda.qnsi.net with ESMTP id JczNMqP4x2ar5fuA for ; Fri, 17 Mar 2017 13:21:40 -0500 (CDT) X-Barracuda-Envelope-From: bhughes@qnsi.net X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message Return-Receipt-To: "Bobby J. Hughes" MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01D29F4B.52522DAF" Disposition-Notification-To: "Bobby J. Hughes" Subject: RE: [FlyRotary] Re: Fuel Pump and Regulator Date: Fri, 17 Mar 2017 13:21:39 -0500 X-ASG-Orig-Subj: RE: [FlyRotary] Re: Fuel Pump and Regulator Message-ID: <74120FDE88CAFE4DBDA8814BCE20A3F3C920DF@qnsi-mail.qnsi.net> In-Reply-To: X-MS-Has-Attach: X-MS-TNEF-Correlator: thread-topic: [FlyRotary] Re: Fuel Pump and Regulator thread-index: AdKfRQytb+34HFwRQN6hxrNv08lL/wABLOUA References: To: "Rotary motors in aircraft" X-Barracuda-Connect: UNKNOWN[10.0.0.5] X-Barracuda-Start-Time: 1489774900 X-Barracuda-URL: http://10.0.0.4:8000/cgi-mod/mark.cgi X-Virus-Scanned: by bsmtpd at qnsi.net X-Barracuda-BRTS-Status: 1 X-Barracuda-Spam-Score: 0.50 X-Barracuda-Spam-Status: No, SCORE=0.50 using global scores of TAG_LEVEL=1000.0 QUARANTINE_LEVEL=1000.0 KILL_LEVEL=1000.0 tests=HTML_MESSAGE, WEIRD_PORT X-Barracuda-Spam-Report: Code version 3.2, rules version 3.2.3.37302 Rule breakdown below pts rule name description ---- ---------------------- -------------------------------------------------- 0.50 WEIRD_PORT URI: Uses non-standard port number for HTTP 0.00 HTML_MESSAGE BODY: HTML included in message This is a multi-part message in MIME format. ------_=_NextPart_001_01D29F4B.52522DAF Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I see 5-6 amps per pump. -6 lines for feed and return. 44 psi at 40" MP with both pumps running. About 1 psi increase with both pumps running. I run both pumps at all times except in cruise. I'm sure the fuel pumps has an inrush current but I would not expect it to be more than a couple of amps. What is your initial battery voltage? Does the fuel pump fuse blow before engaging the starter? =20 Bobby =20 =20 =20 From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]=20 Sent: Friday, March 17, 2017 12:35 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Fuel Pump and Regulator =20 Steve, =20 I used a stock Mazda 1986 fuel pressure regulator, two NAPA 2P4028 fuel pumps in parallel, and an Andair duplex fuel selector valve. The fuel lines are -6 (3/8") except that the fuel return to one of the tanks has an additional 3 ft of -4 (1/4") aluminum tubing. The fuel pumps each move 47 gal/hr against a 7 psi head. =20 The fuel pressure in the rail is 38 psi when either pump is running. The current draw from either pump is 6 amps. =20 When both pumps are running, the fuel pressure in the rail is 39.1 psi when the tank without the additional 1/4" return tubing is selected and 39.6 psi when the tank with the additional 1/4" return tubing is selected. The current draw from both pumps is 12 amps. =20 Since with my setup running both pumps only increases the pressure by about 1 psi, and the 3 ft of 1/4" tubing only adds about 0.5 psi of back pressure with both pumps running, it might be worth checking for a restriction somewhere in your system. =20 Steve Boese =20 ________________________________ From: Rotary motors in aircraft on behalf of steve Izett Sent: Friday, March 17, 2017 3:44:46 AM To: Rotary motors in aircraft Subject: [FlyRotary] Fuel Pump and Regulator=20 =20 Hi Guys I fired up my secondary fuel pump for the first time today and was met with what I didn't expect. Instead of seeing a blip in the fuel pressure, I had a 10psi increase and high current draw from the pump which blew its 10amp fuse. I'll up the fuse as its too low me thinks. I used an old fuel regulator I had on a rail. It was of a Toyota 4AGE engine of about 135hp. Seems like its not able to bypass enough fuel with both pumps running. I think I need to install a higher power adjustable regulator. What experience do you guys have with turning both pumps on simultaneously? I'm putting a pressure switch in the circuit to turn on the backup pump if the fuel pressure drops below a preset level. Appreciate your thoughts and experience. Steve Izett Genesis 4 port EC3 EM3 RD1C in a Glasair Super II RG still nearly finished! -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html ------_=_NextPart_001_01D29F4B.52522DAF Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

I see 5-6 amps per pump. -6 lines for feed and return. 44 psi at = 40” MP with both pumps running. About 1 psi increase with both = pumps running. I run both pumps at all times except in cruise. I’m = sure the fuel pumps has an inrush current but I would not expect it to = be more than a couple of amps. What is your initial battery voltage? = Does the fuel pump fuse blow before engaging the = starter?

 

Bobby

 

 

 

From:= = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] =
Sent: Friday, March 17, 2017 12:35 PM
To: Rotary = motors in aircraft
Subject: [FlyRotary] Re: Fuel Pump and = Regulator

 

Steve,

 

I used a stock = Mazda 1986 fuel pressure regulator, two NAPA 2P4028 fuel pumps in = parallel, and an Andair duplex fuel selector valve. The fuel lines are = -6 (3/8") except that the fuel return to one of the tanks has an = additional 3 ft of -4 (1/4") aluminum tubing.  The fuel pumps = each move 47 gal/hr against a 7 psi head.

 

The fuel = pressure in the rail is 38 psi when either pump is running.  The = current draw from either pump is 6 amps.

 

When both pumps = are running, the fuel pressure in the rail is 39.1 psi when the tank = without the additional 1/4" return tubing is selected and 39.6 psi = when the tank with the additional 1/4" return tubing is = selected.  The current draw from both pumps is 12 = amps.

 

Since with my = setup running both pumps only increases the pressure by about 1 psi, and = the 3 ft of 1/4" tubing only adds about 0.5 psi of back pressure = with both pumps running, it might be worth checking for a restriction = somewhere in your system.

 

Steve = Boese

 

Hi Guys

I = fired up my secondary fuel pump for  the first time today and was = met with what I didn’t expect.
Instead of seeing a blip in the = fuel pressure, I had a 10psi increase and high current draw from the = pump which blew its 10amp fuse.
I’ll up the fuse as its too low = me thinks.

I used an old fuel regulator I had on a rail. It was = of a Toyota 4AGE engine of about 135hp.
Seems like its not able to = bypass enough fuel with both pumps running.

I think I need to = install a higher power adjustable regulator.
What experience do you = guys have with turning both pumps on simultaneously?

I’m = putting a pressure switch in the circuit to turn on the backup pump if = the fuel pressure drops below a preset level.

Appreciate your = thoughts and experience.

Steve Izett
Genesis 4 port EC3 EM3 = RD1C in a Glasair Super II RG still nearly = finished!
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Homepage:  http://www.flyrotary.com/
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