Yep I'm with Vin!

Pump setup menu for V5.0K and newer ECUs.
Press and hold the Limits key then press the + key. This will enter the new pump and NiCad battery
cell count menu. To exit, press any blue key.
There are 3 selections available. 1 = U-accelr1, 2 = U-accelr2, 3 = number of NiCad cells (6-10
selectable). Change U-accelr1

I guess the pump start voltage is between .175 and 2. Increase it two steps with what you are saying.
Is it an old pump? How many tanks between the breather and pump?

Dave