Date: Monday, September 6, 2010, 1:26 PM when Tracy asks me why I'm using check valves, maybe I'm missing a big poin= t [not again!].=A0 I thought it was std practice to run redundant electric = fuel pumps in parallel.=A0 I was going to use check valves to keep the flow= going the right direction.=A0 some facet pumps have built-in check valves,= [40148] but I have yet to locate anyone who sells them.=A0 I am using a Web= er carb, so only need low-pressure pumps.=A0 I had actually bought a "red p= ump" like Lynn suggested, but two of them weigh like 10 lbs.=A0 I was hopin= g 2 facet cube pumps would work for me.=A0 a bosch 68758 also may work, but= I can't find all the specs for it.[pressure?, volume?] so is the redundancy overkill?=A0 =A0 =A0 KevinLane Carpentry www.KevinLaneCarpentry.com --0-607759655-1283804852=:47743 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable

Kevin,

You are on the right track.

If you are using Facet fuel pumps they typically do not have the built= in

check valves like the high pressure pumps that Tracy sells.

I am using a Facet pump as a "Boost" pump mounted close to the fuel ta= nk

to feed the high pressure pumps on the firewall.

I also have a gravity feed line to the fuel pumps with a check valve i= n it to allow fuel to flow

to the pumps, by-passing the boost pump.

The boost pump was something that the designer of my plane though= t I might need when he inspected my fuel system.

Jim Maher

Dyke Delta 13B

--- On Mon, 9/6/10, kevin lane <n3773@c= omcast.net> wrote:

From: kevin lane <n3773@comcast.net>
Sub= ject: [FlyRotary] check valves [again]
To: "Rotary motors in aircraft" &= lt;flyrotary@lancaironline.net>
Date: Monday, September 6, 2010, 1:26= PM

when Tracy asks me why I'm using check va= lves, maybe I'm missing a big point [not again!]. I thought it was st= d practice to run redundant electric fuel pumps in parallel. I was go= ing to use check valves to keep the flow going the right direction. s= ome facet pumps have built-in check valves,[40148] but I have yet to locate= anyone who sells them. I am using a Weber carb, so only need low-pre= ssure pumps. I had actually bought a "red pump" like Lynn suggested, = but two of them weigh like 10 lbs. I was hoping 2 facet cube pumps wo= uld work for me. a bosch 68758 also may work, but I can't find all th= e specs for it.[pressure?, volume?]

so is the redundancy overkill?

KevinLane Carpentry
www.KevinLaneCa= rpentry.com

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