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n1cxo320(at)salidaco.com
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 Posted: Fri May 25, 2007 9:46 am Post subject: Eggenfelner FWF Probelm - Help! |
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A friend is about done with an Eggenflener FWF pacakge in his RV7A and
has asked me to look into a problem with the electronic/electrical system.
Here's what is being observed, and if anyone has seen anything like
this, I'd sure like to hear from you before I spend a LOT of time
studying his manuals to see if I can deduce what the problem is.
With the master switch on, fuel pressures appear normal as shown on his
EIS and on a mechanical pressure indicator he has added. BUT when he
switches on the ignition switch, (engine not running) the EIS shows
increasing fuel pressures up to over 200PSI, which is wrong since the
mechanical meter still shows the 31PSI or so that the EIS was showing
before the ignition switch was placed to "on." The engine starts and
runs normally. Also indications are abnormal with the fuel pump selector
placed in the 'auto' position when the EIS voltmeter indication shows an
increase to 19.5-volts while an analog voltmeter shows a rather normal
14.3-volts.
Really weird. I am going to spend the afternoon studying the rather
involved and complex (and sometimes missing) data in his three LARGE
three-ring binders to see if I can explain his symptoms.
Any assistance would be appreciated.
John
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Ed Anderson
Joined: 10 Jan 2006
Posts: 475
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| Posted: Fri May 25, 2007 10:09 am Post subject: Eggenfelner FWF Probelm - Help! |
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John, sounds like the fuel pressure sensor wiring might not be correct. It
appears to me that when you turn on the ignition somehow more current is
flowing in the circuit than the system expects and this is read as more
pressure from the sensor. Check the wiring between the fuel pressure
sensor and the EIS.
Ed
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Ed Anderson
Rv-6A N494BW Rotary Powered
Matthews, NC
eanderson@carolina.rr.com |
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pitts_pilot(at)bellsouth.
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| Posted: Fri May 25, 2007 11:23 am Post subject: Eggenfelner FWF Probelm - Help! |
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John, first I would suspect a poor ground from the engine to the
airframe. Next best guess is a poor ground somewhere else in the
system. So, the bill totals to 2 pennies, one for each SWAG  .
Linn
do not archive
John Fasching wrote:
| Quote: |
A friend is about done with an Eggenflener FWF pacakge in his RV7A and
has asked me to look into a problem with the electronic/electrical
system.
Here's what is being observed, and if anyone has seen anything like
this, I'd sure like to hear from you before I spend a LOT of time
studying his manuals to see if I can deduce what the problem is.
With the master switch on, fuel pressures appear normal as shown on
his EIS and on a mechanical pressure indicator he has added. BUT when
he switches on the ignition switch, (engine not running) the EIS
shows increasing fuel pressures up to over 200PSI, which is wrong
since the mechanical meter still shows the 31PSI or so that the EIS
was showing before the ignition switch was placed to "on." The engine
starts and runs normally. Also indications are abnormal with the fuel
pump selector placed in the 'auto' position when the EIS voltmeter
indication shows an increase to 19.5-volts while an analog voltmeter
shows a rather normal 14.3-volts.
Really weird. I am going to spend the afternoon studying the rather
involved and complex (and sometimes missing) data in his three LARGE
three-ring binders to see if I can explain his symptoms.
Any assistance would be appreciated.
John
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Dale Ensing
Joined: 11 Jan 2006
Posts: 571
Location: Aero Plantation Weddington NC
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| Posted: Fri May 25, 2007 12:06 pm Post subject: Eggenfelner FWF Probelm - Help! |
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Another thing you might check John, is the proximity of the fuel pressure
sensor lead to any 'fat' wires. I had a similar experience with my CHT & EGT
because the sensor wires were too close to the large wire from the battery .
The sensor wires need to be a minimum of 2 inches away from the magnetic
field given off the high current wires.
Dale Ensing
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Dale Ensing
RV-6A
Aero Plantation
Weddington NC |
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marcausman
Joined: 08 Feb 2007
Posts: 70
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| Posted: Sat Jun 02, 2007 5:44 am Post subject: Re: Eggenfelner FWF Probelm - Help! |
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John, the fuel pressure sensor is a bit if an oddball because you also need to connect the sensor wire to a resistor, then to a reference voltage pin on the EIS. Suggest reviewing the install diagram and double check. The reference voltage keeps the sensor accurate while voltage fluctuates.
Also, if you haven't solved it by Monday, call Sandy at GRT and she has seen it all and is very helpful.
Marc
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Marc Ausman
http://www.verticalpower.com "Move up to a modern electrical system"
RV-7 IO-390 Flying |
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