: = --------------=20 The Facet pump in this position is a two edged sword. It can help = eliminate a vapor lock when on but it is a restriction that can create a = vapor lock when off. A properly laid out fuel system should not = require another pump to prime the main EFI pump. It is a bandaid IMO. = Again, any restriction other than a strainer to stop the 'big chunks' = before the EFI pumps is not a good thing. Tracy -------------------------------------------------------------------------= ----- No virus found in this incoming message. Checked by AVG Anti-Virus. Version: 7.0.300 / Virus Database: 265.8.8 - Release Date: 2/14/2005 ------=_NextPart_000_00F0_01C514C3.D6C7E550 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable

Hi, Kelly....the efi pumps are the last = item before=20 the fuel rail and fuel pressure regulator. Here is the basic = system... The=20 fuel in the main tanks goes downhill to the fuel selector. Fuel then = goes=20 downhill again through the Facet pump into the top of the sump tank. = Fuel then=20 comes out of the bottom of the sump tank through the gascolator into the = EFI=20 pump(s), then to the fuel rail with fuel pressure regulator attached, = then that=20 returned fuel goes back into the top of the sump tank. That is the = complete system. Take care. Paul Conner

----- Original Message -----

From:=20 Kelly = Troyer

To: Rotary motors in = aircraft

Sent: Thursday, February 17, = 2005 12:36=20 AM

Subject: [FlyRotary] Re: Vapor = Lock

Paul,

I have forgotton your exact fuel system layout.......Do = your efi=20 pumps push

fuel from sump tank to fuel valve then to engine or are they = installed=20 after the

fuel valve and suck fuel from all the way back to the sump = tank =20 ? I tend to

agree with Tracy and others that the Facet boost pump is a=20 restriction.....Have

you tried removing it and heating the engine as in previous tests = to see=20 if

you get a vapor lock ?

--
Kelly Troyer
Dyke=20 Delta/13B/RD1C/EC2

--------------=20 Original message from "Tracy Crook" <lors01@msn.com>: = --------------=20

The Facet pump in this position is a two edged sword. It = can help=20 eliminate a vapor lock when on but it is a restriction that can = create a=20 vapor lock when off. A properly laid out fuel system = should not=20 require another pump to prime the main EFI pump. It is a = bandaid=20 IMO. Again, any restriction other than a strainer to stop the = 'big=20 chunks' before the EFI pumps is not a good thing.

Tracy

No virus found in this incoming message.
Checked by AVG=20 Anti-Virus.
Version: 7.0.300 / Virus Database: 265.8.8 - Release = Date:=20 2/14/2005
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