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  #1  
Old 09-24-2019, 09:57 AM
Mark33's Avatar
Mark33 Mark33 is offline
 
Join Date: May 2010
Location: Baton Rouge, La.
Posts: 757
Default Help needed diagnosing high fuel pressure readings

Hi gang, I need a little help diagnosing a problem. The fuel pressure readings on my Dynon D-180 started fluctuating all over the place and I?m constantly getting a ?high fuel pressure? alert. The engine is an IO-360 180/HP. equipped with both a mechanical and electric fuel pump along with a red-cube. The engine is running fine and all connections appear to be secure. There?s no rhyme or reason as to when the high pressure alarm goes off. It does it LOP in a low power cruise configuration just as often as it does on takeoff with the electric fuel pump running with high power settings. When I?m looking at the fuel pressure gauge on the EMS page I?m getting constant fluctuations ranging from about 10 psi. all the way to about 40 psi. and it never settles down to any particular steady reading. Like I said above, all connections appear to be good, so where do I start? Fuel filters? Sender? Air trapped in the line? Thanks in advance.
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RV-7- IO-360, EFII, Whirl Wind C/S, (Built and sold)
RV-4- O-320, Catto three blade, P-Mags (Sold)
RV-8- IO-360, Hartzell C/S (Flying)
RV-7- (Building)
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  #2  
Old 09-24-2019, 10:21 AM
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bjdecker bjdecker is offline
 
Join Date: Jun 2005
Location: Georgetown, TX
Posts: 953
Default Wiring...

Mark,

I would start by checking the wiring at the transducer, then I'd swap the transducer with new/known good one.

Another item to check is fuel pressure reading without the engine running -- just turn everything on and run the boost pump and see what the pressure reading is and how it behaves.

Cheers,

B
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  #3  
Old 09-24-2019, 10:28 AM
SPX SPX is offline
 
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Location: San Diego
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Also check in the Dynon settings that the fuel pressure sensor is still set to the correct type. If it isn?t, the fuel pressure indication will be all over the place, and not accurate.
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  #4  
Old 09-24-2019, 11:15 AM
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DanH DanH is offline
 
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Location: 08A
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Which sensor is being used?
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  #5  
Old 09-24-2019, 12:15 PM
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Mark33 Mark33 is offline
 
Join Date: May 2010
Location: Baton Rouge, La.
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Thanks guys for the suggestions, I?ll investigate further.

Quote:
Originally Posted by DanH View Post
Which sensor is being used?
Dan, I?ll have a chance to pull the cowling next week, so I?ll confirm what type it is then.
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Mark H.
RV-7- IO-360, EFII, Whirl Wind C/S, (Built and sold)
RV-4- O-320, Catto three blade, P-Mags (Sold)
RV-8- IO-360, Hartzell C/S (Flying)
RV-7- (Building)
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  #6  
Old 09-24-2019, 06:31 PM
Scott Hersha Scott Hersha is offline
 
Join Date: Jan 2005
Location: Cincinnati, OH
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I?m anxious for an answer to this one too. I have exactly the same indications with my new (to me) O-360 powered RV4, except mine is carbureted and I have the GRT VDO pressure sender/EIS 4000. So help us out please... Thanks. Not trying to rob your thread....
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  #7  
Old 09-24-2019, 08:17 PM
pilot2512 pilot2512 is offline
 
Join Date: Aug 2007
Location: Spring, TX
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You need to find your pressure sensor (red cube is for fuel flow). Then you need to very carefully check the ground connection. Pull the wire at the terminal to make sure it is holding solid and take the connection apart and verify it is clean and to a good ground.

Jay
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  #8  
Old 09-24-2019, 08:29 PM
bob888 bob888 is offline
 
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Location: Fresno, CA
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Carefully check any and all connectors in the circuit.
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  #9  
Old 09-24-2019, 08:42 PM
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Mark33 Mark33 is offline
 
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Location: Baton Rouge, La.
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Thanks again gentlemen for the suggestions. Hopefully I?ll have a chance to get back out to the airplane next week and further investigate and verify everything.
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Mark H.
RV-7- IO-360, EFII, Whirl Wind C/S, (Built and sold)
RV-4- O-320, Catto three blade, P-Mags (Sold)
RV-8- IO-360, Hartzell C/S (Flying)
RV-7- (Building)
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  #10  
Old 09-24-2019, 09:41 PM
alpinelakespilot2000 alpinelakespilot2000 is offline
 
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Quote:
Originally Posted by Mark33 View Post
The fuel pressure readings on my Dynon D-180 started fluctuating all over the place and I’m constantly getting a “high fuel pressure” alert.
I had this problem early in my -9's life. I found the solution to be bleeding the fuel line at the fuel pressure sender. Eventually I put it on my annual condition inspection to do list. It also only happened when I used to have a VDO sender. Now with the Kavlico transducer I don't even have to bleed the system. I think the combination of air in the line with the VDO sender was the problem for me. Hope this helps.
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