X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [129.116.87.142] (HELO MAIL01.austin.utexas.edu) by logan.com (CommuniGate Pro SMTP 4.3.6) with ESMTP id 618095 for flyrotary@lancaironline.net; Thu, 28 Jul 2005 15:59:32 -0400 Received-SPF: none receiver=logan.com; client-ip=129.116.87.142; envelope-from=mark.steitle@austin.utexas.edu X-MimeOLE: Produced By Microsoft Exchange V6.5.7226.0 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C593AE.C465BCCA" Subject: RE: [FlyRotary] Re: fuel filter question Date: Thu, 28 Jul 2005 14:58:47 -0500 Message-ID: <87DBA06C9A5CB84B80439BA09D86E69E016C1C05@MAIL01.austin.utexas.edu> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [FlyRotary] Re: fuel filter question Thread-Index: AcWTrT5TVkuOcnpaS1aSa8VqHFX/1QAAIddw From: "Mark R Steitle" To: "Rotary motors in aircraft" This is a multi-part message in MIME format. ------_=_NextPart_001_01C593AE.C465BCCA Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable A little more searching and I found a schematic of a Peugeot on the Bosch web site. Both diagrams show the tank, then the pump, then the filter. Not that some others don't do it differently, but I haven't seen any. I think there is a good reason the designers put the filter downstream from the pump. As Tracy has pointed out before, efi pumps don't suck very well, they are designed to push fuel at high pressure. My system has coarse screen filters in the tank, and two efi filters downstream from the pumps. Caveat... I have done 9 hours of ground testing, but no flight test as yet. Mark S. =20 ________________________________ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Mark R Steitle Sent: Thursday, July 28, 2005 2:47 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: fuel filter question =20 Did a Google search on "VW Jetta fuel system". Here is a cut-n-paste from the very first hit. =20 1985 Volkswagen Jetta NHTSA Recall ID Number: 87V053000 Recall Date: APR 14, 1987=20 Component: FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP=20 Potential Units Affected: 278520=20 Summary: FUEL PUMP, LOCATED INSIDE FUEL TANK, COULD SEIZE DURING HIGH AMBIENT TEMPERATURES BECAUSE OF AN EXTREME FINE MESH FUEL FILTER RESTRICTING THE FUEL FLOW.=20 Consequence: FUEL SUPPLY TO ENGINE WOULD BE PARTIALLY INTERRUPTED,RESULTING IN STALLING.=20 Remedy: INSTALL A MODIFIED FUEL PUMP AND FILTER.=20 Notes: VOLKSWAGEN OF AMERICA,INC,=20 =20 =20 Mark S. =20 =20 ________________________________ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of jesse farr Sent: Thursday, July 28, 2005 2:42 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: fuel filter question =20 Isn't the reason for that most efi cars have pump in tank so would be kind of hard to do ? jofarr, soddy tn ----- Original Message ----- From: Mark R Steitle =20 ,=20 As I recall, putting the filter between the tank and pump was true for the pre EFI cars, which were prone to vapor locking. But I can't think of any of the newer EFI cars that put the filter before the pump (excluding screen filters). Can you provide any examples? ------_=_NextPart_001_01C593AE.C465BCCA Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

A little more searching and I found = a schematic of a Peugeot on the Bosch web site.  Both diagrams show = the tank, then the pump, then the filter.  Not that some others = don’t do it differently, but I haven’t seen any.  I think there is a = good reason the designers put the filter downstream from the pump.  As = Tracy has = pointed out before, efi pumps don’t suck very well, they are designed to push = fuel at high pressure.  My system has coarse screen filters in the tank, = and two efi filters downstream from the pumps.  Caveat… I have done 9 = hours of ground testing, but no flight test as yet.

Mark = S.

 

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Mark R Steitle
Sent: Thursday, July 28, = 2005 2:47 PM
To: Rotary motors in = aircraft
Subject: [FlyRotary] Re: = fuel filter question

 

Did a Google search on “VW = Jetta fuel system”.  Here is a cut-n-paste from the very first = hit. 

1985 Volkswagen Jetta NHTSA Recall ID = Number: 87V053000

Recall Date: APR 14, 1987
Component: FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP
Potential Units = Affected: 278520
Summary: = FUEL PUMP, LOCATED INSIDE FUEL TANK, COULD SEIZE DURING = HIGH AMBIENT TEMPERATURES BECAUSE OF AN EXTREME FINE MESH FUEL FILTER = RESTRICTING THE FUEL FLOW.
Consequence: FUEL = SUPPLY TO ENGINE WOULD BE PARTIALLY INTERRUPTED,RESULTING IN = STALLING.
Remedy: INSTALL A = MODIFIED FUEL PUMP AND FILTER.
Notes: VOLKSWAGEN OF AMERICA,INC,

 

 

Mark S.  =

 

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of jesse farr
Sent: Thursday, July 28, = 2005 2:42 PM
To: Rotary motors in = aircraft
Subject: [FlyRotary] Re: = fuel filter question

 

Isn't = the reason for that most efi cars have pump in tank so would be kind of hard to do = ?

jofarr, = soddy tn

----- = Original Message ----- From: Mark R Steitle =

,

As I recall, putting the filter = between the tank and pump was true for the pre EFI cars, which were prone to = vapor locking.  But I can’t think of any of the newer EFI cars that = put the filter before the pump (excluding screen filters).  Can you = provide any examples?

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