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UMA Fuel Pressure Sender Settings and Wiring
Author: Matt Liknaitzky Reference Number: AA-00325 Views: 28121 Created: 2012-07-16 21:41 Last Updated: 2017-02-08 17:15 0 Rating/ Voters

Attached are settings and wiring connections for the UMA Fuel Pressure Senders. This can be used to help if you are experiencing problems or if you suspect your fuel pressure sender is reading incorrectly.

Remember to follow these 3 Steps when troubleshooting senders.


  • Follow mounting instructions with sensor
  • Pressure fitting on the sensor is 1/8” NPT Female (needs male NPT fitting on fuel pressure hose).
  • Outer thread is for optional mounting use and is 5/8-18

Use MGL Avionics Modification “(M)” UMA Fuel Pressure Sensors Only:

Typically used for Injected Lycoming Engines:
100 PSI Fuel Pressure Sender - UMA N1EU100G(M)

Typically used for Carbureted Lycoming Engines:

35 PSI Fuel Pressure Sender - UMA N1EU35G(M)

Typically used for Jabiru and Rotax Engines:
7 PSI Fuel Pressure Sender - UMA N1EU07G(M)

RDAC VD, XB, XD Connections:

For RDAC VD, XB and XD there are 3 possible locations for connecting the signal line of the Fuel Pressure Sensor. Use whichever is available, preferably CHT1/WT/AUX3:

  • CHT1/WT/AUX3
  • Fuel Level 2

RDAC XF and XF MAP Connections

  • Fuel Pressure Input
  • Note: FuelP PU Dipswitch must be ON

Infinity or Velocity Single Connections

  • Pressure Input


Red (or Orange/White)

12V Power

Black (or Blue/White)

RDAC Ground

White Wire

Signal wire - see above for RDAC model or Infinity/Velocity input




Your setup should reflect the correct Probe Type (linear, voltage, 0.5-4.5V), Correct Location, and Correct Pressure range:


Enigma/Voyager/Odyssey EFIS:

Infinity or Velocity Single:

Your Setup should reflect the Correct Sender used (7, 35, 100 PSI models)

IMPORTANT NOTICE: You must make your own determination if the products sold by MGL Avionics are safe and effective for your intended applications. MGL Avionics makes no representations or warranties as to either the suitability of any of the products we sell as to your particular application or the compatibility of any of the products we sell with other products you may buy from us or anywhere else, and we disclaim any warranties or representations that may otherwise arise by law. Also, we offer no specific advice on how to install any of the products we sell other than passing along anything that may have been provided to us by the manufacturer or other users. If you are in need of further information or guidance, please turn to the manufacturer, FAA Advisory Circulars and guidance materials, the Experimental Aircraft Association, or other reputable sources.