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-   -   Garmin Fuel Pressure Sender Unit Rupture (https://vansairforce.net/community/showthread.php?t=150042)

Aussieflyer 06-01-2017 12:29 AM

Garmin Fuel Pressure Sender Unit Rupture
 
I fitted Garmin G3X (dual) & GTN650. I used Garmin engine instruments. The Garmin Fuel Pressure Sender Unit (Part Number 494-30004-02) failed after 6 months operation (80 hours). The sender unit ruptured fuel through the sender into the wiring plugs and pins and down the fire wall. Fire Hazard - possibly.

I have never heard of a sender unit rupturing before, however my concerns being if the factory could build one bad sender, there may be a batch of them out there.

Bought my gear in 2014/15. Not happy with Garmin as they provided no warranty. The unit new in the aircraft, however the warranty allegedly expired while sitting on my shelf, what happens when it sits on Garmin's shelves, apparently that's a different matter.

GTRV10 03-16-2020 01:48 AM

Hi @aussieflyer - did you ever get to the bottom of this issue. I'm going through the same problem. One sensor ruptured after 25 hours - I replaced it, now another ones just gone 20 hours later.

TS Flightlines 03-16-2020 08:14 AM

Ruptured? 30 psi?
Some pictures of this would to fabulous.

Tom

g3xpert 03-16-2020 03:00 PM

Failed Fuel Pressure Sensor
 
Quote:

Originally Posted by GTRV10 (Post 1414880)
Hi @aussieflyer - did you ever get to the bottom of this issue. I'm going through the same problem. One sensor ruptured after 25 hours - I replaced it, now another ones just gone 20 hours later.

Good Afternoon,

We would be happy to look into this for you. Can you provide us with a little more information on your installation so we can help get to the bottom of this? What part number fuel pressure sensor are you using?

Thanks,

Justin

Aussieflyer 03-16-2020 03:23 PM

In response to your query. I replaced the sender unit in 2017 @ 80 hours. I'm now at 400 hrs and no problems with the replacement. I'm saddened to hear another unit has ruptured. I suspect more than just two units have faulted, I hope I'm wrong. Anyone else had a failure?

GTRV10 03-17-2020 02:58 AM

Hi Justin,
RV10 with dual garmin G3x and GTN750. 11-09477 GarminG3x Fuel Press Unjected 50 PSIG 1/8-27 NPT.
I've had 2 sensors rupture now each after 20 odd hours, exactly the same scenario as Aussieflyer - fuel through the sender into the wiring plugs and pins and down the fire wall.
I'll be stripping it this weekend and will send photo's.

GTRV10 03-17-2020 03:53 AM

Thanks @aussieflyer - good to hear your issue is sorted out and clearly the sender unit being the problem. In my case having burst 2 sensors now, I'm questioning the pressure output of my primer and fuel pump. I'll test these with external pressure gauge and revert back. This said I've never noticed and excessive fuel pressure reading whilst it's been working.

TS Flightlines 03-17-2020 07:08 AM

Justin, I would think that the senders would be rated to 100 psi at least. With Some electronic injections running near 50psi, I personally think that 100 psi of more is necessary.
Now we dont know that the OPs package is, but gee---this is a cause for pause:
So much attention to hoses to take large amounts of pressure and fluids, and a sender could rupture (using the OPs words) in flight is alarming.

Definitely need more information on this!
Tom

g3xpert 03-17-2020 10:34 AM

Sensor Specifications
 
Quote:

Originally Posted by TS Flightlines (Post 1415226)
Justin, I would think that the senders would be rated to 100 psi at least. With Some electronic injections running near 50psi, I personally think that 100 psi of more is necessary.
Now we dont know that the OPs package is, but gee---this is a cause for pause:
So much attention to hoses to take large amounts of pressure and fluids, and a sender could rupture (using the OPs words) in flight is alarming.

Definitely need more information on this!
Tom

Tom,

The proof pressure of this sensor is 2X and the burst pressure is 3X, which for the 50 psi sensor would be 150 psi.

Thanks,

Justin

g3xpert 03-17-2020 10:43 AM

Fuel Pressure Sensor RMA
 
Quote:

Originally Posted by GTRV10 (Post 1415195)
Hi Justin,
RV10 with dual garmin G3x and GTN750. 11-09477 GarminG3x Fuel Press Unjected 50 PSIG 1/8-27 NPT.
I've had 2 sensors rupture now each after 20 odd hours, exactly the same scenario as Aussieflyer - fuel through the sender into the wiring plugs and pins and down the fire wall.
I'll be stripping it this weekend and will send photo's.

We would like to exchange the sensor for you and bring it in so we can characterize the failure and run some tests on the sensor. Can you email us at G3Xpert@Garmin.com, so we can set up the exchange? Any pictures you have of the sensor installed in the aircraft would be helpful as well.

Thanks,

Justin


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