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High Fuel Pressure - Extreme Rich

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jkreidler

Joined: 13 Feb 2008
Posts: 151
Location: Sheboygan Falls WI

Posted: Sat May 09, 2009 5:48 pm Post subject: High Fuel Pressure - Extreme Rich

Fired up today for our first short taxi test.  The engine would not run over 1350 RPM WOT.  Fuel pressure was 48 PSI.  After shutting down we pulled the plugs, they were all black, way black.  Indicating the engine was very rich.  The air box had raw fuel in it.  We have an Airflow Performance injection.



We didn't have this problem during our last test run.  Since then we have performed the service bulletin on the mags, I double checked the timing.  I did not try to lean the engine using mixture, I think the richness may be caused by the excess fuel pressure, and not the actual mixture setting.  I could be wrong but I don't think the mixture would be that far off.



Any thoughts??



Jason Kreidler

4-Partner Build

N44YH - #40617

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rene(at)felker.com
Guest

Posted: Sat May 09, 2009 6:39 pm Post subject: High Fuel Pressure - Extreme Rich

There is a service bulletin on the RSA fuel injection systems.  I don't have

it here to get the numbers, but if I remember right, that is the failure

mod......you lose power.  There is a screw on the side of the controller

that needs to be checked.....



Just an idea.



Rene'

801-721-6080

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gengrumpy(at)aol.com
Guest

Posted: Sat May 09, 2009 6:41 pm Post subject: High Fuel Pressure - Extreme Rich

You gotta lean this engine on the ground.  Sounds like you had it  

flooded to have the fuel in the air box.



Did it run right on the first runup (ie, confirm your tach is correct?)



grumpy



do not archive



On May 9, 2009, at 8:48 PM, jkreidler wrote:



 	  Quote: 	
		   

 >



 Fired up today for our first short taxi test.  The engine would not  

 run over 1350 RPM WOT.  Fuel pressure was 48 PSI.  After shutting  

 down we pulled the plugs, they were all black, way black.   

 Indicating the engine was very rich.  The air box had raw fuel in  

 it.  We have an Airflow Performance injection.



 We didn't have this problem during our last test run.  Since then we  

 have performed the service bulletin on the mags, I double checked  

 the timing.  I did not try to lean the engine using mixture, I think  

 the richness may be caused by the excess fuel pressure, and not the  

 actual mixture setting.  I could be wrong but I don't think the  

 mixture would be that far off.



 Any thoughts??



 Jason Kreidler

 4-Partner Build

 N44YH - #40617





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p 43333#243333

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jkreidler

Joined: 13 Feb 2008
Posts: 151
Location: Sheboygan Falls WI

Posted: Sat May 09, 2009 6:52 pm Post subject: Re: High Fuel Pressure - Extreme Rich

Seemed to run OK on the first run up, we had normal fuel pressures around 30.  I understand the theory behind leaning while on the ground, but if the idle mixture has been set correctly leaning on the ground is not required (for 'standard' conditions).  This is according to the folks at Airflow Performance.  The manual provided with our fuel controller goes through this procedure.



Leaning also does not explain the high fuel pressure......



Thanks, Jason

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Kellym

Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ

Posted: Sat May 09, 2009 6:53 pm Post subject: High Fuel Pressure - Extreme Rich

He has AirFlow Perfomance injection, not RSA, so should not have that 

issue. I'm still trying to figure how he gets fuel pressure 50% above 

redline.



Rene wrote:

[quote] 



 There is a service bulletin on the RSA fuel injection systems.  I don't have

 it here to get the numbers, but if I remember right, that is the failure

 mod......you lose power.  There is a screw on the side of the controller

 that needs to be checked.....



 Just an idea.



 Rene'

 801-721-6080

 --

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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD

nicholscatoauto(at)aol.co
Guest

Posted: Sun May 10, 2009 11:33 am Post subject: High Fuel Pressure - Extreme Rich

Jason,

 I am not real familiar with mechanical fuel injection but on a car high fuel pressure is usually caused by a blocked return line and the pump putting out max pressure. 

 

 Jeff

 #648

 

 

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