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08-30-2013, 08:53 AM
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Join Date: Aug 2013
Location: Cocoa Beach FL
Posts: 21
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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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08-30-2013, 09:01 AM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,420
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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.
__________________
Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010
Phase 1 done, 2/4/2011 
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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08-30-2013, 11:17 AM
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Join Date: Sep 2009
Location: Dublin, GA
Posts: 256
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Fuel pressure
I am no expert but I think I remember that somewhere around 30 psi is required for fuel injection atomization.
__________________
Maxwell Duke
Kitfox S6/TD/IO240/SteamIFR Built it
RV10 IO540/AFS5600x3 Bought it
CH750 O200/AFS5500. Built it with 7 friends. DAR-Vic Syracuse
Maule M7-235C Sold it(kind of miss it)
VAF paid 5/2017
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08-30-2013, 11:43 AM
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Join Date: May 2012
Location: Houston tx
Posts: 124
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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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Byron
1977 Mooney 201
Houston, TX
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08-30-2013, 11:58 AM
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Join Date: Aug 2013
Location: Cocoa Beach FL
Posts: 21
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Quote:
Originally Posted by Mike S
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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Thanks!!
It is a Silver Hawk EX by precision airmotive.
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08-30-2013, 02:20 PM
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Join Date: Jul 2009
Location: Dixon Ca
Posts: 91
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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
__________________
John Cumins A & P for way to long
N864JF Reserved
Emp complete , slow build Wings Fuel Tanks Finished, ailerons, and bottom wing skins ready to rivet on. Working on Flaps
My Build log http://websites.expercraft.com/jcrv10
Home Base VCB Nut Tree
Eaa 1230 VP
VAF 2015 Dues Gladly Paid
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08-30-2013, 05:31 PM
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Join Date: Dec 2008
Location: Big Sandy, WY
Posts: 2,567
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15 psi on a carb won't run.
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Actual repeat offender.
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08-30-2013, 10:03 PM
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Join Date: Jul 2009
Location: Dixon Ca
Posts: 91
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Yep my mistake the low pressure is approx 5 psi, the book says 4 - 6 psi.
My bad
__________________
John Cumins A & P for way to long
N864JF Reserved
Emp complete , slow build Wings Fuel Tanks Finished, ailerons, and bottom wing skins ready to rivet on. Working on Flaps
My Build log http://websites.expercraft.com/jcrv10
Home Base VCB Nut Tree
Eaa 1230 VP
VAF 2015 Dues Gladly Paid
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08-30-2013, 10:18 PM
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Join Date: Oct 2005
Posts: 1,516
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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.
__________________
Ernst Freitag
RV-8 finished (sold)
RV-10 Flyer 600 plus hours
Running on E10 mogas
Don't believe everything you know.
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08-30-2013, 11:24 PM
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Join Date: Jan 2006
Location: South Africa
Posts: 840
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With the same AFS and Dynon setup I am getting about 24 with the engine pump and about 34 with the electrical pump on.
__________________
Jan Hanekom
South Africa
Approved Person nr 325
http://www.rvbits.com
RV10 - ZU-XOX - (Flying)
RV7A - ZU-JRV - (Flying)
RV10 - ZU-JVR - (Written off)
RV7 - ZU-LOL - (Flying)
RV10 - ZU-RVI - (Flying)
RV7A - ZU-MER (Bought back)
RV7A - ZU-JAD (Sold Flying)
Dues paid for 2020 WITH A SMILE
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