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  #1  
Old 08-30-2013, 08:53 AM
jimfaber jimfaber is offline
 
Join Date: Aug 2013
Location: Cocoa Beach FL
Posts: 21
Default High Fuel Pressure on IO540

I am reading what I would consider high fuel pressure on my IO540. It runs about 30 to 32psi on the ground and increases to 34 psi with the fuel pump on. It drops slightly at full power. In flight it is consistently reading 29 to 32 psi. with the fuel pump off. It will increase another 2 psi with the fuel pump on.

Is this something to be concerned about and what should I do to trouble shoot this?

I just bought this RV-10 in June and any help or suggestions would be appreciated.

Thanks,

Jim Faber
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  #2  
Old 08-30-2013, 09:01 AM
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Mike S Mike S is offline
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Location: Dayton Airpark, NV A34
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Default Welcome to VAF!

Jim, to the good ship VAF.

What brand of injection do you have?? Knowledgeable folks may want to know the brand to determine if the pressures are normal.

In my 10, with AFP injection that is about where my fuel pressures run.

Good to have you aboard, you are gonna love the RV 10.
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  #3  
Old 08-30-2013, 11:17 AM
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n981ms n981ms is offline
 
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Default Fuel pressure

I am no expert but I think I remember that somewhere around 30 psi is required for fuel injection atomization.
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  #4  
Old 08-30-2013, 11:43 AM
jetdriven jetdriven is offline
 
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Location: Houston tx
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Default

My IO-360-A3B6 with the Bendix RSA-5AD1 runs ~28-30 PSI on the ground, 32 PSI on the ground, and will do 34 PSI with the electric pump on. We recently replaced the fuel pump due to fuel pressure dropping to 12 PSI in flight at higher altitudes. It would go from 28-13 PSI randomly. According to Lycoming, 13 PSI is fine but you could feel the engine leaning out and the plane slowing down when the fuel pressure dropped. I didnt like it, regardless of what they said.
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  #5  
Old 08-30-2013, 11:58 AM
jimfaber jimfaber is offline
 
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Location: Cocoa Beach FL
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Default

Quote:
Originally Posted by Mike S View Post
Jim, to the good ship VAF.

What brand of injection do you have?? Knowledgeable folks may want to know the brand to determine if the pressures are normal.

In my 10, with AFP injection that is about where my fuel pressures run.

Good to have you aboard, you are gonna love the RV 10.
Thanks!!

It is a Silver Hawk EX by precision airmotive.
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  #6  
Old 08-30-2013, 02:20 PM
jc11378 jc11378 is offline
 
Join Date: Jul 2009
Location: Dixon Ca
Posts: 91
Default Fuel Pressure

30 Psi is what you want with fuel injection. It will not work right with out that pressure. 15 Psi is what carbs will want to see with engine running.

You are perfectly fine.

My Piper Saratoga runs between 30 and 25 all the time and it runs great.

IO540k1g5
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  #7  
Old 08-30-2013, 05:31 PM
aerhed aerhed is offline
 
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Default

15 psi on a carb won't run.
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  #8  
Old 08-30-2013, 10:03 PM
jc11378 jc11378 is offline
 
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Yep my mistake the low pressure is approx 5 psi, the book says 4 - 6 psi.

My bad
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  #9  
Old 08-30-2013, 10:18 PM
N427EF N427EF is offline
 
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Default 25 PSI

The AFP fuel pump is calibrated to produce 25 PSI.
The high pressure mechanical fuel pump also produces <25psi>
I don't see anything wrong with 30 psi but 25 generally considered normal.
I believe the new EFFII pump is calibrated to produce 30 PSI.
More pressure will reduce the chance of vapor lock.
Can't remember exactly but fuel injection still runs fine at 15 psi or even less.
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  #10  
Old 08-30-2013, 11:24 PM
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Janekom Janekom is offline
 
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Default

With the same AFS and Dynon setup I am getting about 24 with the engine pump and about 34 with the electrical pump on.
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