REFLECTOR: Fuel system design

[Jones Nick]

The return line is at the engine driven fuel pump, before the sensor. All the fuel going through the sensor is getting burned, none is being returned to the tank.

Best regards,

Nick and Connie Jones
Velocity XL-RG
N10CN
99% done 90% to go

From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of Alex Balic
Sent: Friday, February 17, 2012 6:35 PM
To: 'Velocity Aircraft Owners and Builders list'
Subject: Re: REFLECTOR: Fuel system design

You need another sensor somewhere on the return line, most equipment can calculate the difference (Dynon, GRT, JPI)

From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of Jones Nick
Sent: Friday, February 17, 2012 3:42 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Fuel system design

I am installing an IO-550 N27B engine from a Cirrus SR22. The fuel flow sensor is attached to the inter cylinder baffle support between #1 and #3 cylinders inline just before the throttle body. In this location, only the fuel that is consumed by the engine is measured. The fuel that is returned to the sump tank is not part of the measurement.
[cid:image001.jpg at 01CCEFAB.0D838170]

I figure that there are thousands flying and this is a good location for them so it's good enough for me.

I would not use hose for your interior fuel lines as they are permeable and will require replacing after 5 years.

Best regards,

Nick and Connie Jones
Velocity XL-RG
N10CN
99% done 90% to go

From: reflector-bounces at tvbf.org<mailto:reflector-bounces at tvbf.org> [mailto:reflector-bounces at tvbf.org] On Behalf Of Reiff Lorenz
Sent: Friday, February 17, 2012 3:10 PM
To: reflector at tvbf.org<mailto:reflector at tvbf.org>
Subject: REFLECTOR: Fuel system design


Reflector,

I will want to start plumbing my fuel and vent system soon, but have many questions. I'd appreciate any advice you have.


1.       Should I use aluminum tubing and flaired connections, as described in the plans? Or would flexible hoses & compression fittings work better? Are there other solutions? I'm looking for the easiest installation and maintenance.

2.       For monitoring fuel flow: What brand of fuel flow sensor should I use? Should there be 2 separate sensors, one between each strake tank and the sump? (I will be installing a Continental 550, so there will be a fuel line to the engine and a fuel return from the engine.)

3.       What's the best resource for learning how to bend/flair/connect/secure the fuel lines. I flipped through 2 of the Bingellis books and did not find much good information. I have not yet checked his engine books . . . maybe there's more info in those.

Thanks for any help you can provide!

Reiff Lorenz
XL-RG, 30% done
wings/canard/strakes/fuselage structure complete
Still to do: install fuel system, controls, hydraulics, electrical system, engine, interior, avionics, sand, prime, paint, fly

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