Displaying fuel pressure on EDM830

[Ibra]

Hi all,

Does anyone know how to display fuel pressure on EDM830? 

I have fuel flow indication (GPH), however, no fuel pressure (PSI) and I can’t find how in programming menu and I am not sure if it need some sensor?

I still have an analog display on Rochester gauges, however, it’s getting tired and wiggly 

On a side note does M20J require indication of fuel pressure? it seems ok to fly without according to 91.205 

 

[kortopates]

You mean after you buy and install an appropriate fuel pressure transducer? then go into programming mode to enable its display following instructions in your pilot guide.
It’s required, it being your factory oem fuel pressure gauge because Mooney published limitations on fuel pressure.
Your EDM-830 doesn’t legally replace the factory gauge so you might prefer to put your $ towards fixing it; else upgrade to an EDM-900 so you can ditch the factory gauges.

you should realize there is a ton of required equipment on your Mooney not listed in 91.205 starting with the stall horn. Modern mooney’s include a KOEL list that gets more complete the more recent the manufacturing date.

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[Ibra]

I think I will have more luck with upgrading to new EDM than fixing anything with so many gremlins behind the pannel 

I could not find fuel pressure limits  (14-30PSI) on Mooney TCDS, however, it's on Lycoming IO360 TCDS, I assume this what makes it a legal requirement? 

Edited November 8 by Ibra

[kortopates]

section 2 of your POH and my recollection is that Mooney spec the upper limit much lower than lycoming did causing a lot of grief with mooney’s that had to replace their fuel pumps since the newer/updated lycoming pump pressure runs higher.


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[PT20J]

The airframe manufacturer gets to set limitations for the engine as installed because the airframe manufacturer designs the fuel, induction, exhaust and mounting systems. Of course the airframe manufacturer will have coordinated the design and limitations with the engine manufacturer.

Section II of the POH constitutes the FAA-approved Airplane Flight Manual and the limitations therein are approved by the FAA and legally binding. 

[Ibra]

6 hours ago, PT20J said:

Section II of the POH constitutes the FAA-approved Airplane Flight Manual and the limitations therein are approved by the FAA and legally binding. 

Yes I see Fuel Pressure limit in Section2

Indeed, the limits by aeroplane manufacturer can be different from engine limits, I see CHT 500F limit on my Lycoming in engine data versus CHT 475F limit on  Mooney in airframe data 

It's not clear when an airframe limitation would require an equipment? I have G-limit on my airframe in Section2, yet I don't have G-meter sensor in aircraft 

Maybe it's likely an overkill for "normal category" and nice yo have on "aerobatic category", having said that I can my use my body to measure G-limit as well as combination airspeed, vertical speed and bank angle but I don't have a certified instrument to do it

For fuel pressure, one can't comply with limitation without having working sensor and data displayed 

Edited November 9 by Ibra

[Aerodon]

On 11/8/2024 at 12:47 PM, Ibra said:

Hi all,

Does anyone know how to display fuel pressure on EDM830? 

I have fuel flow indication (GPH), however, no fuel pressure (PSI) and I can’t find how in programming menu and I am not sure if it need some sensor?

I still have an analog display on Rochester gauges, however, it’s getting tired and wiggly 

On a side note does M20J require indication of fuel pressure? it seems ok to fly without according to 91.205 

 

Fuel Pressure is not an option available on an EDM830.  Time to upgrade to an EDM900.

 

Aerodon

[Pinecone]

Check your limitations.

My 252/Encore lists fuel flow limits in Section II, but nothing about Fuel Pressure.

[kortopates]

58 minutes ago, Pinecone said:

Check your limitations.

My 252/Encore lists fuel flow limits in Section II, but nothing about Fuel Pressure.

You just switched the discussion from Lycoming to Continental - very different. 

[Pinecone]

Someone had to.

[jetdriven]

On 11/10/2024 at 8:08 AM, Aerodon said:

Fuel Pressure is not an option available on an EDM830.  Time to upgrade to an EDM900.

 

Aerodon

For the same money, the GI275 EIS is better.  

[kortopates]

I’ll disagree on Garmin EIS. EDM is still superior especially when it comes to leaning tools and Fuel pressure. Fuel pressure on the Garmin EIS’ suffer from large fluctuations that don’t typically respond with a snubber to dampen them. JPI has invested in quite a bit of smoothing s/w to dampen fluctuations.

The big pro on Garmin is its level of integration of the EIS with flight data which is very nice but it comes at expense of some basic needs which surprises me after all these years.


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[Ibra]

1 hour ago, jetdriven said:

For the same money, the GI275 EIS is better.

That could be an option as well 

[jetdriven]

1 hour ago, kortopates said:

I’ll disagree on Garmin EIS. EDM is still superior especially when it comes to leaning tools and Fuel pressure. Fuel pressure on the Garmin EIS’ suffer from large fluctuations that don’t typically respond with a snubber to dampen them. JPI has invested in quite a bit of smoothing s/w to dampen fluctuations.

The big pro on Garmin is its level of integration of the EIS with flight data which is very nice but it comes at expense of some basic needs which surprises me after all these years.


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We probably put 300 hours on the Garmin EIS, and when you install the GEA 24B there's no wild fuel pressure fluctuation in fact there's no fluctuation at all. The latest install had a GEA24 and it has no fluctuation, the software has been updated. 

The Garmin EIS also has a superior leaning algorithm, and it even gives you the GAMI spread and which cylinder peaks first and last and which fuel flow. 

It's also a touchscreen it also displays other pages such as a summary page that shows Max Rpm, Max oil temp and Max CHT, including peak cooling rate. You can also place tick marks in different areas, including the normal gauge value.  And if you have a 275 MFD, you can display your NAV2 on that you can also display the EGT page on that full-time.    Or traffic,  weather, terrain.  etc.