Near enuf is good enuf,
"Fuel to start and operate the APU comes from the left side of the fuel manifold when the AC fuel pumps are operating. A DC operated APU fuel boost pump is installed to ensure positive fuel pressure to the APU fuel control unit. During APU start and operation, the pump operates automatically when the APU fuel control unit senses low fuel pressure. The pump shuts off automatically when an AC fuel pump pressurizes the fuel manifold. If the AC and DC fuel pumps are not operating, fuel is suction fed from the No.1 tank."
The above is a quote from the 737 NG AOM.
I dont want to sound like a p***k, but there is no mention of another pump anywhere. Of course, this doesnt mean it doesnt excist, the APU section in the AOM covers three(3) whole pages. Its so short, you can actually read it and not fall asleep.
