EDM Fuel pressure

[cbogie]

 

repost to engine monitor group.

Anyone else seen this scenario????

EDM 900 fuel pressure shows a red X only when boost pump is on.  Shows normal indication when running on engine driven pump only.  

Ideas.??   Sensor going open when at higher pressure??  trying to reach JPI now.

[ArtVandelay]

Is this one of the models with low and high boost?

[PeteMc]

Is there a Max Pressure setting?  Maybe when you turn the Boost Pump on it exceeds whatever is set in there as Max.  Though I guess it would/should show a Max, not an X. 

I wonder if the pump causes some sort of turbulence so the transducer doesn't give an accurate reading?  (But purely a guess on fluids, no clue on the actual setup.) 

[ArtVandelay]

Is there a Max Pressure setting?  Maybe when you turn the Boost Pump on it exceeds whatever is set in there as Max.  Though I guess it would/should show a Max, not an X. 
I wonder if the pump causes some sort of turbulence so the transducer doesn't give an accurate reading?  (But purely a guess on fluids, no clue on the actual setup.) 

I thought it was boost pump->engine pump->fuel servo and this is where pressure is measured, so far downstream it should not be effected?