X-CGP-ClamAV-Result: CLEAN X-VirusScanner: Niversoft's CGPClamav Helper v1.23.0 (ClamAV engine v0.103.0) X-Junk-Score: 0 [] X-KAS-Score: 0 [] From: "Bobby Hughes BHughes@qnsinc.net" Received: from us-smtp-delivery-128.mimecast.com ([170.10.133.128] verified) by logan.com (CommuniGate Pro SMTP 6.3.11) with ESMTPS id 1012211 for flyrotary@lancaironline.net; Sat, 21 May 2022 12:14:12 -0400 Received-SPF: pass receiver=logan.com; client-ip=170.10.133.128; envelope-from=bhughes@qnsinc.net Received: from QNSI-EX2016.qnsinc.local (207-91-159-28.nstci.net [207.91.159.28]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id us-mta-260-sDaERk7lNi64kMjxdsUAxQ-1; Sat, 21 May 2022 12:13:51 -0400 X-MC-Unique: sDaERk7lNi64kMjxdsUAxQ-1 Received: from QNSI-EX2016.qnsinc.local (10.0.0.34) by QNSI-EX2016.qnsinc.local (10.0.0.34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.20; Sat, 21 May 2022 11:13:50 -0500 Received: from QNSI-EX2016.qnsinc.local ([fe80::e455:3daa:dac4:de26]) by QNSI-EX2016.qnsinc.local ([fe80::e455:3daa:dac4:de26%2]) with mapi id 15.01.2308.020; Sat, 21 May 2022 11:13:50 -0500 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Fuel pressure trending lower. Thread-Topic: [FlyRotary] Fuel pressure trending lower. Thread-Index: AQHYbR9jsXxmcuOzFESWauMgeASv+K0pgUTj Date: Sat, 21 May 2022 16:13:50 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA28A264 smtp.mailfrom=bhughes@qnsinc.net X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: qnsinc.net Content-Language: en-US Content-Type: multipart/alternative; boundary="_000_SN6PR05MB53112483B0BCB691E25EDE93A6D29SN6PR05MB5311namp_" --_000_SN6PR05MB53112483B0BCB691E25EDE93A6D29SN6PR05MB5311namp_ Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Do EFI pumps have an internal check valve? Dirty fuel filter? Bobby Get Outlook for iOS ________________________________ From: Rotary motors in aircraft on behalf of = Finn Lassen finn.lassen@verizon.net Sent: Saturday, May 21, 2022 9:30:30 AM To: Rotary motors in aircraft Subject: [FlyRotary] Fuel pressure trending lower. Recently I noticed my fuel pressure being low. Noticed because engine did n= ot come up in power when advancing to full throttle. Noticed mixture real l= ean. Checking fuel pressure as low as 28 psi (normally 35 and up to 40 at f= ull throttle). Going over my engine logs since first flight I now see that fuel pressure h= as been trending lower through each flight -- more pronounced on longer fli= ghts (40+ minutes). More and more pronounced over the months and became rea= lly noticeable over last month. Could explain why mixture tuning appeared t= o have changed. Nice to have engine logs from practically each flight. But why? Pump getting weaker? My primary fuel pump is a GSL414. I figured it was wasted energy to push wa= y more fuel than needed through the pressure regulator back to the tank. My secondary (backup) pump is a GSL393. When turning that on, fuel pressure= comes back up to where it needs to be. Anyone have experience with failing or weak EFI pumps, particularly the GSL= 414? Finn Disclaimer The information contained in this communication from the sender is confiden= tial. It is intended solely for use by the recipient and others authorized = to receive it. If you are not the recipient, you are hereby notified that a= ny disclosure, copying, distribution or taking action in relation of the co= ntents of this information is strictly prohibited and may be unlawful. This email has been scanned for viruses and malware, and may have been auto= matically archived by Mimecast Ltd, an innovator in Software as a Service (= SaaS) for business. Providing a safer and more useful place for your human = generated data. Specializing in; Security, archiving and compliance. To fin= d out more visit the Mimecast website. --_000_SN6PR05MB53112483B0BCB691E25EDE93A6D29SN6PR05MB5311namp_ Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable <= /head>
Do EFI pumps have an internal check valve? Dirt= y fuel filter?  

Bobby
From: Rotary motors in airc= raft <flyrotary@lancaironline.net> on behalf of Finn Lassen finn.lass= en@verizon.net <flyrotary@lancaironline.net>
Sent: Saturday, May 21, 2022 9:30:30 AM
To: Rotary motors in aircraft <flyrotary@lancaironline.net> Subject: [FlyRotary] Fuel pressure trending lower.
 

Recently I noticed my fuel pressure being low. Noticed because engine di= d not come up in power when advancing to full throttle. Noticed mixture rea= l lean. Checking fuel pressure as low as 28 psi (normally 35 and up to 40 a= t full throttle).

Going over my engine logs since first flight I now see that fuel pressur= e has been trending lower through each flight -- more pronounced on longer = flights (40+ minutes). More and more pronounced over the months and bec= ame really noticeable over last month. Could explain why mixture tuning appeared to have changed. Nice to = have engine logs from practically each flight.

But why? Pump getting weaker?

My primary fuel pump is a GSL414. I figured it was wasted energy to push= way more fuel than needed through the pressure regulator back to the tank.=

My secondary (backup) pump is a GSL393. When turning that on, fuel press= ure comes back up to where it needs to be.

Anyone have experience with failing or weak EFI pumps, particularly the = GSL414?

Finn



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The information contained in this communication from the sender i= s confidential. It is intended solely for use by the recipient and others a= uthorized to receive it. If you are not the recipient, you are hereby notif= ied that any disclosure, copying, distribution or taking action in relation= of the contents of this information is strictly prohibited and may be unla= wful.

This email has been scanned for viruses and malware, and may h= ave been automatically archived by Mimecast Ltd, an innovator in Sof= tware as a Service (SaaS) for business. Providing a safer and mo= re useful place for your human generated data. Specializing in; Securi= ty, archiving and compliance. To find out more Click Here.

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