Setting up gph k factor on -60 red cube

Okay, I have finally got gph flow thingy on my G3X. When I turn on master (aux fuel pump running), I'm showing 1 gph fuel flow (engine not running).

Obliviously, I need to adjust k factor to account for return to tank fuel flow. Current k factor is 68,000 (I think)...anybody got suggestions as to how much and what direction to fix?

Ric.
I got 107829 after a 1 hour cross country flight.

http://www.vansairforce.com/community/showpost.php?p=1069069&postcount=1

A more recent discussion here:-

http://www.vansairforce.com/community/showthread.php?t=152452

I recently asked Van's support about putting a second red cube onto the return line and got this reply:-

"I have no reasons to tell you not to install a second flow transducer. We opted to only use one as it proved accurate enough for our needs.

Sterling

Van's Aircraft
14401 Keil Rd
Aurora, Oregon 97002
503.678.6545"

I always start with empty wing tanks, then add a known quantity - 20-30 gallons or so. After burning that down to empty tanks again, I compare how much I actually burned to what the totalizer says and adjust the K factor accordingly. (I can completely empty the wings on my plane because my engine runs off a header tank.)

If you can't empty the wings in flight and if you have a scale, you can weigh the gas you drain out of the wings.