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: " 12348ung@gmail.com" Received: from mail-pf1-f181.google.com ([209.85.210.181] verified) by logan.com (CommuniGate Pro SMTP 6.3.11) with ESMTPS id 1013109 for flyrotary@lancaironline.net; Sat, 21 May 2022 17:58:35 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.210.181; envelope-from=12348ung@gmail.com Received: by mail-pf1-f181.google.com with SMTP id y41so10511158pfw.12 for ; Sat, 21 May 2022 14:58:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:references:in-reply-to:subject:date:message-id:mime-version :thread-index:content-language; bh=ReBIBB5QXJ6aZSU0t+Ga5e9F2PMmyWcwBIPdxsTvDSY=; b=ZM+Eb46im2f9OpefraaQykK8S68ekoVWmAQqlF0FdP9b7AF+WoFZZJ8TwvFA119ov9 iyPSADNLzHXngxe/DRaEVsfYhil3VCWYi01bcy5Cdb1h/DrZD3Sjmig6XBGqRboVsUtq MdIaJxfXKBPCpDjWzImnC6UUVdVTGyxk/ASxQRWlWBxn5jA+HTlZHPt9WPEGajZ0Ij9e J54QvdKtpdg0GopwzvooyoWhChB75N8OSYxD7Kx7sM32N8TEXgLNJV8LPSqDBypqyekF FtzdBni2B0oCvqjt9v+l8UfQuvcZ3rgfRTmahAYCasG92n5iXQf1epbevmF40KypRuGD 8/gw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:references:in-reply-to:subject:date :message-id:mime-version:thread-index:content-language; bh=ReBIBB5QXJ6aZSU0t+Ga5e9F2PMmyWcwBIPdxsTvDSY=; b=Yisu8DP29gS+2+vU+aFfzYJ1reoyQ8oHutv3SagupYVYGYU9s/OopNFu+tqqTQlcL8 1rjB7fISY8g4R8tytGr5I7oSSW55BvE2ojnBaWUbim4ODotktg65KBnolrjuUlt8IfJt BFNLOO2MFVw+DUBSnfrJlQKjYyicSmc+lKOmTe4KRQ4W6nESDMhmKYXr1yXX/FPWMgug woBiU8futMwitEdNr1O3ISG6HA9aZzA78Ys2LEH0lL2A1IOEFx3BCyuYXqLbXuxJ0ZX/ XDgHk5vYvQHd7myCMx8M7CFlh5WgsZR+VSPdT9Zv3Z0Zsedb6QFj+ey9XtQzR1/bT26R eWcA== X-Gm-Message-State: AOAM5302jB/8gQEpn/v2wRBR0ia9vKVMjzRfP78GSro71pWb6MOYZvVd sFGo2J0a+zS0+VK0/MQiyGP/rp2dnsQ= X-Google-Smtp-Source: ABdhPJzynCBRmlOHz9Ab9eoJjJW0YDGKrZH4nLHSvRLBcrA1OQ/zhwNQIgTNPk2F1r7VFbvWK23fOA== X-Received: by 2002:a05:6a00:1348:b0:518:6ef5:ac3 with SMTP id k8-20020a056a00134800b005186ef50ac3mr9632097pfu.69.1653170297934; Sat, 21 May 2022 14:58:17 -0700 (PDT) Return-Path: <12348ung@gmail.com> Received: from UserPC ([103.198.24.78]) by smtp.gmail.com with ESMTPSA id p187-20020a6229c4000000b0050dc762818esm4059170pfp.104.2022.05.21.14.58.15 for (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sat, 21 May 2022 14:58:17 -0700 (PDT) To: "'Rotary motors in aircraft'" References: In-Reply-To: Subject: RE: [FlyRotary] Re: Fuel pressure trending lower. Date: Sun, 22 May 2022 07:58:13 +1000 Message-ID: <000001d86d5d$e033d8f0$a09b8ad0$@gmail.com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01D86DB1.B1DFE8F0" X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQJ0l04R84kRp7rXV/1o6A+nK5kAgqvxjBXw Content-Language: en-us This is a multipart message in MIME format. ------=_NextPart_000_0001_01D86DB1.B1DFE8F0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Finn, Once again the blind leading the blind, but it appears that = wear and old age has gotten to your pump. I suspect that as with the = second pump all is normal, then that excludes filter and water etc, just = needs a replacement pump IMHO. Easy when it is your money! Neil. =20 =20 From: Rotary motors in aircraft =20 Sent: Sunday, May 22, 2022 2:14 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Fuel pressure trending lower. =20 Do EFI pumps have an internal check valve? Dirty fuel filter? =20 =20 Bobby =20 Get Outlook for iOS =20 _____ =20 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.=20 =20 Recently I noticed my fuel pressure being low. Noticed because engine = did not come up in power when advancing to full throttle. Noticed = mixture real lean. Checking fuel pressure as low as 28 psi (normally 35 = and up to 40 at full throttle). Going over my engine logs since first flight I now see that fuel = pressure has been trending lower through each flight -- more pronounced = on longer flights (40+ minutes). More and more pronounced over the = months and became 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 = pressure comes back up to where it needs to be. Anyone have experience with failing or weak EFI pumps, particularly the = GSL414? Finn =20 Disclaimer The information contained in this communication from the sender is = confidential. 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 any disclosure, copying, distribution or taking action in = relation of the contents of this information is strictly prohibited and = may be unlawful. This email has been scanned for viruses and malware, and may have been = automatically 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 find out more Click = Here. ------=_NextPart_000_0001_01D86DB1.B1DFE8F0 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

Finn,

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0 Once again the blind leading the blind, but it appears that wear = and old age has gotten to your pump.=C2=A0 I suspect that as with the = second pump all is normal, then that excludes filter and water etc, just = needs a replacement pump IMHO.

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Easy when it is your = money!

Neil.

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0

 

From: Rotary motors in aircraft = <flyrotary@lancaironline.net>
Sent: Sunday, May 22, = 2022 2:14 AM
To: Rotary motors in aircraft = <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: = Fuel pressure trending lower.

 

Do EFI pumps have an internal check valve? Dirty fuel = filter?  

 

Bobby

Recently I = noticed my fuel pressure being low. Noticed because engine did not come = up in power when advancing to full throttle. Noticed mixture real lean. = Checking fuel pressure as low as 28 psi (normally 35 and up to 40 at = full throttle).

Going over my engine logs since first flight I now = see that fuel pressure has been trending lower through each flight -- = more pronounced on longer flights (40+ minutes). More and more = pronounced over the months and became 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 pressure comes = back up to where it needs to be.

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

Finn

 

Disclaimer

= The information contained in this communication from the sender is = confidential. 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 any disclosure, copying, distribution or taking action in = relation of the contents of this information is strictly prohibited and = may be unlawful.

This email has been scanned for viruses and = malware, and may have been automatically 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 = find out more Click = Here= .

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