Message Name:

MAIN EJECTOR FUEL PRESSURE DISPLAYED WITH NO ENGINES OR APU RUNNING

While engines and APU are not running, the fuel synoptic page displaying fuel pressure at the left or right Main Ejectors.

• Left Main Ejector Pressure Switch (S4)
• Right Main Ejector Pressure Switch (S5)
• Remote Data Concentrator Unit (A13)
• Associated Wiring

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

1. Make sure no engines or APU are running.
2. Access and remove the Remote Data Concentrator Unit (RDC). Perform a continuity to ground check of the affected side Main Ejector Pressure Switch as follows:
   NOTE: Continuity to ground = Low fuel pressure 28 VDC = Pressure
   
   Left Main Ejector Pressure Switch:
   

   From	To	Expected Result	Result
   A13BP1-3F	Ground	Continuity

   Right Main Ejector Pressure Switch:

   From	To	Expected Result	Result
   A13EP1-10G	Ground	Continuity

   1. If there is continuity to ground, replace the RDC and do close out.
   2. If there is no continuity to ground, continue with next step.

3. Perform a 28 VDC voltage check on the affected side as follows:
   
   Left Main Ejector Pressure Switch:
   

   From	To	Expected Result	Result
   A13BP1-3F	Ground	0 VDC

   Right Main Ejector Pressure Switch:

   From	To	Expected Result	Result
   A13EP1-10G	Ground	0 VDC

   1. If there is 28 VDC, replace the affected Main Ejector pressure switch and do close out.
   2. If there is no 28 VDC, continue with next step.

4. Perform a wiring check between the Main Ejector pressure switch and the RDCU as follows and repair defective wiring as required.
   
   Left Main Ejector Pressure Switch:
   

   From	To	Result
   A13BP1-3F	S4P1-A

   Right Main Ejector Pressure Switch:

   From	To	Result
   A13EP1-10G	S5P1-A

5. Do close out.