REFLECTOR: FUEL PRESSURE PUZZLE

Tom Martino tmartino at troubleshooter.com
Sat Aug 26 09:05:42 CDT 2006


  
The sensor is on the firewall and has worked great for 60 hours.
 
-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Ron Brown
Sent: Saturday, August 26, 2006 7:04 AM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: FUEL PRESSURE PUZZLE
 
Tom,
 
You're right - that doesn't make sense.  
 
Make sure the fuel pressure sensor is not mounted on the engine or
otherwise picking up engine vibration.
 
This sensor should be mounted on the firewall and be fed from a fitting
off the discharge of engine's mechanical fuel pump.  There should be a
restriction (small orifice - 1/16" or smaller) which should dampen any
pulses to the fuel pressure sensor as well as limit fuel flow if the
sensor or its line ruptures.
 
Has it been acting this way ever since you started flying it or did this
just start happening?
 
Ronnie  
 
 
	----- Original Message ----- 
	From: Tom Martino <mailto:tmartino at troubleshooter.com>  
	To: reflector at tvbf.org 
	Sent: Saturday, August 26, 2006 2:17 AM
	Subject: REFLECTOR: FUEL PRESSURE PUZZLE
	 
	Something is happening that I can't figure out.   My engine
(IO-540) runs great ... but the fuel pressure reading (EFIS One w/
resistive sender) goes down as I increase power.  In fact, at 2700 RPM
... fuel pressure reads "0".  Obviously, I was getting pressure because
the engine was running perfectly, but the reading was zero.
	 As I decrease power, the fuel pressure goes back up to normal
(28 - 30).
	I thought it was simply an instrument error ... BUT ... when I
turn on the "boost" pump ... during the low readings ... the pressure
reading goes back up to normal.  Turn the boost pump off and it goes
down to zero.  So, the gauge is reading the Boost Pump but NOT the
mechanical pump.
	What would cause my pressure reading to go down at higher power
settings in an almost linear fashion?
	By the way ... I checked the fuel venting and cleaned the fuel
filter.  Everything is good on that end.
	Where do I begin?
	Tom
	
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