Fuel pressure is measured on the unmetered side of the servo (between the fuel pump and the servo), fuel flow is measured on the metered side (between the servo and the spider).

 

On the metered side of the servo, fuel pressure will vary according to throttle position. Some cheap FF gages will connect to the spider and read this pressure, the face of the gage is marked in GPH/PPH but it’s still just a pressure gage.

 

-----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Jon Socolof
Sent: Wednesday, April 14, 2010 8:49 AM
To: lml@lancaironline.net
Subject: [LML] Fuel Pressure Setup

 

I’m setting up IO 550 in my Legacy. I’m taking the fuel pressure off the metered side (spider). The typical Lancair setup attaches the fuel pressure line to the unmetered side which I think would only show the fuel pump output. How is everybody else setting up?

 

Jon

Lancair Legacy