REFLECTOR: Fuel Flow Sensor

[Keith Hallsten]

Vapor lock in the fuel flow transducer sounds ridiculous as a concern!  If
that was real, you would obviously have much more significant issues with
cavitation in the pump itself.  I'm just installing my FloScan fuel flow
transducer - upstream of the boost pump, and downstream of the fuel filter.
I've got about 8" of "nearly straight" line between the filter and the
transducer, and about 4" of straight line after the transducer before the
first 90-degree bend.  I will be very surprised if there is any problem with
calibration of the fuel flow reading.

I am trying to keep all of these devices (shut-off valve, filter,
transducer, pump) at or below the level of the middle of the sump tank, so
that there is at least a tiny bit of fuel pressure to help prevent
cavitation at the pump, but I'm not real worried about it.

Keith Hallsten
XLFG


-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Brett Ferrell
Sent: Thursday, June 30, 2005 6:07 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Fuel Flow Sensor

I agree that it should be fine, there is a note in the sensor section of 
this month's Kitplanes that claims the issue is vapor lock due to the sensor

being on the suction side.  That *could* be an issue, but sounds like a 
wives tale to me.

Brett