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  #1  
Old 12-27-2022, 07:38 AM
Jcurry Jcurry is offline
 
Join Date: Jul 2021
Location: Cocoa,Fl
Posts: 136
Default Higher fuel pressure when cold OAT?

Hello,
My fuel press is going too high and triggering the alarm on my Dynon D180. This has been happening since we dropped into the 30s. I don't if this is temp related or if the fuel press xducer is failing on me. I suspect the latter. I'm sure I have the old school xducer. My xducer is mounted on the fire wall.
What do you think? Thanks.
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Jack
Titusville, Fl
Already flying 2011 RV12 N214LA


My youtube channel: Southern Latitudes Sport Aviation
https://youtube.com/@SouthernLatitudesAviation
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  #2  
Old 12-27-2022, 09:11 AM
lr172 lr172 is offline
 
Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 8,042
Default

quite unlikely that cold temps would make any meaningful difference in fluid pressure sensor readings. An exception would be a sensor that is failing inside, but only acting up / showing symptoms when cold. That is not uncommon. The old diaphragm style sensors (transducers are solid state) do not last forever and not uncommon to fail early. Sensors have only two connections (sometimes only one connector and grounded via the threads) and transducers have three (almost never grounded via threads).
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Last edited by lr172 : 12-27-2022 at 09:16 AM.
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  #3  
Old 12-27-2022, 09:21 AM
Cth6 Cth6 is offline
 
Join Date: Apr 2017
Location: Central Florida
Posts: 296
Default Temp Related

Quote:
Originally Posted by Jcurry View Post
Hello,
My fuel press is going too high and triggering the alarm on my Dynon D180. This has been happening since we dropped into the 30s. I don't if this is temp related or if the fuel press xducer is failing on me. I suspect the latter. I'm sure I have the old school xducer. My xducer is mounted on the fire wall.
What do you think? Thanks.
Once the engine is warmed up does the alarm go away? If not, I would surmise that the sender is warmed enough by the engine to point to a bad transducer.
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  #4  
Old 12-27-2022, 03:09 PM
Avanza Avanza is offline
 
Join Date: Jul 2020
Location: Vastervik Sweden
Posts: 216
Smile +32F

At +32F water may freeze.
Depending on where the xducer is located in the system this may
show up as high or low pressure.

Good luck
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  #5  
Old 12-28-2022, 07:25 AM
Jcurry Jcurry is offline
 
Join Date: Jul 2021
Location: Cocoa,Fl
Posts: 136
Default

Quote:
Originally Posted by lr172 View Post
quite unlikely that cold temps would make any meaningful difference in fluid pressure sensor readings. An exception would be a sensor that is failing inside, but only acting up / showing symptoms when cold. That is not uncommon. The old diaphragm style sensors (transducers are solid state) do not last forever and not uncommon to fail early. Sensors have only two connections (sometimes only one connector and grounded via the threads) and transducers have three (almost never grounded via threads).
Hi Larry,
I agree with everything you said. I was using the term transducer loosely. Thanks for your reply. I now have a fuel pressure sensor and oil pressure sensor on order.
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Jack
Titusville, Fl
Already flying 2011 RV12 N214LA


My youtube channel: Southern Latitudes Sport Aviation
https://youtube.com/@SouthernLatitudesAviation
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  #6  
Old 12-28-2022, 07:29 AM
Jcurry Jcurry is offline
 
Join Date: Jul 2021
Location: Cocoa,Fl
Posts: 136
Default

Quote:
Originally Posted by Cth6 View Post
Once the engine is warmed up does the alarm go away? If not, I would surmise that the sender is warmed enough by the engine to point to a bad transducer.
Hi CT,
Thanks for your reply. I also believe the sensor is failing.
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Jack
Titusville, Fl
Already flying 2011 RV12 N214LA


My youtube channel: Southern Latitudes Sport Aviation
https://youtube.com/@SouthernLatitudesAviation
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  #7  
Old 12-28-2022, 01:39 PM
IlliniRV12 IlliniRV12 is offline
 
Join Date: Dec 2022
Location: Kewanee, Illinois
Posts: 4
Default fuel pressure sensor and oil pressure sensor

I too had a high fuel pressure alert on my Dynon D180 yesterday in cold weather 24 degrees. If you replaced the fuel pressure sensor and oil pressure sensor did it fix the problem and where did you purchase them from?

Jerry Kewanee Illinois
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  #8  
Old 12-28-2022, 02:49 PM
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tfoster100 tfoster100 is offline
 
Join Date: Feb 2011
Location: Dallas Ft Worth
Posts: 123
Default

I also noticed high fuel pressure readings in the cold weather here in Dallas. Wasnít that cold around 30ís. Newer build with only 45 hours. May look into replacing as well.
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  #9  
Old 12-28-2022, 05:58 PM
Jcurry Jcurry is offline
 
Join Date: Jul 2021
Location: Cocoa,Fl
Posts: 136
Default

Quote:
Originally Posted by IlliniRV12 View Post
I too had a high fuel pressure alert on my Dynon D180 yesterday in cold weather 24 degrees. If you replaced the fuel pressure sensor and oil pressure sensor did it fix the problem and where did you purchase them from?

Jerry Kewanee Illinois
Hi Jerry,
I'm "winging" this but in conjunction with what Larry said above, I suspect the diaphragm in older sensors are less pliable and stiffen considerably in colder temps producing higher readings. That's my theory...
My parts have not arrived yet. They are due in tomorrow. I ordered the sensors on Amazon.
Fuel Sensor 360-043 0-30 psi $58.16
Oil Sensor 360-430 0-150 psi $71.42

Of course it's warming back up here in Florida....
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Jack
Titusville, Fl
Already flying 2011 RV12 N214LA


My youtube channel: Southern Latitudes Sport Aviation
https://youtube.com/@SouthernLatitudesAviation

Last edited by Jcurry : 12-29-2022 at 07:51 AM.
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  #10  
Old 12-29-2022, 10:17 AM
IlliniRV12 IlliniRV12 is offline
 
Join Date: Dec 2022
Location: Kewanee, Illinois
Posts: 4
Default Higher fuel pressure when cold OAT?

Hello Jack

It's 54 degress in Illinois right now all the snow has melted. Thank you for quick your response. My annual is coming up next month so I will have plenty to do, thank you for the part numbers. Jerry
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