Bud,
The reading was taken off the double banjo that feeds the passenger side
carb. This as done when the engine seemed to be running correctly.
Being at sea level and with about a 29.8pressure day I figured these did not
sound too bad. I do have the original differential pressure sender. I will
fire it up at work on Monday and see if it is reading correctly before
installing it or ordering a new one. Aircraft spruce is very proud of that
little sender now days.
_____
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of ofamerica.com
YERLY
Sent: Thursday, July 02, 2009 11:11 PM
Subject: Re: Europa-List: Fuel system - More Questions!
Rich,
I'll run mine or Bakers tomorrow, weather permitting, and see what my fuel
pressure does. If memory serves, I start at 4 psi at idle and at full
throttle still see about 4 in line, and about 10.0 off the regulator (my
sender reads a little low). My gut feel is that regulated fuel pressure is
going up with manifold pressure as it should, but if line pressure is going
up to the regulator, that does not pass the common sense test. On ground
tests, the fuel pressure goes up as the resistance goes up.
Example:
When I set up a fuel system, I disconnect the feed and pressure gauge from
the engine fuel regulator and pump fuel through the lines past a direct
reading pressure gauge (Tee'd to the aircrafts sender) and through a valve
to a gas can. This allows me to filter the system, verify flow rates (by
timing) and by closing off the valve, I can verify the fuel pressure, the
fuel flow decreases and the pressure goes up well above 7 psi as I check
flows and verify pressure readings. Note: These readings are done before
the regulator.
11.6 psi indicates a strong reduction in flow if reading prior to the
regulator, however if you are reading from the regulator, the regulated
pressure at full power 39.5 MP is about 5 psi boost, and 11.6 psi fuel
pressure is a tad high.
>From Page 9.2.3 of the Rotax maintenance manual, Fuel pressure =Airbox
pressure + 250hPa At takeoff performance the fuel pressure is going to be
about 700hPa or around . 7bar or about 10.15 psi
I'll talk to you after testing.
The shop took a lightning strike and power surge, so I have only one shop
phone left and it blew my shop computer, even with the surge protectors.
Pretty spectacular really. Snap crackle pop all in one. I will be slow at
answering emails for a few more days.
Bud
----- Original Message -----
From: TheSchultzFamily <mailto:Theschultzfamily@comcast.net>
Sent: Thursday, July 02, 2009 9:08 PM
Subject: RE: Europa-List: Fuel system - More Questions!
Can anyone verify these "non" differential fuel pressure readings?
MP = 14.3 Fuel = 4.6
MP - 14 Fuel = 4.9
MP = 20 Fuel = 4.9
MP = 25 Fuel = 6.4
MP = 30 Fuel = 9.1
MP = 39.5 Fuel = 11.6
Engine seems to be running fine with these but earlier in the process the
engine was once again surging. Everyone that hears the surging thinks I have
a fuel problem????
Monitoring and testing continues...
Rich Schultz
N262AE
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