737APU的供油方式的问题

消逝的鱼

查了下手册，目前南航机队的apu供油方式按有效性有两种，一种是交流燃油泵，APU直流泵和一号油箱抽吸，另一种是不带apu直流泵（多数）。
不知抽吸方式是如何实现的，把油从左1油箱抽到apu？

cwj0396

Apu自身的燃油泵。

peterpollicy

对于没有DC增压泵的飞机：
The APU fuel feed system supplies fuel from any tank to the APU.

The center tank boost pumps or the boost pumps in main tank No. 1 and main tank No. 2 supply fuel to the APU. If the boost pumps are off, the APU suctions fuel from main tank No. 1.

The APU fuel shutoff valve lets fuel flow from the left engine fuel feed manifold to the APU.

对于有DC增压泵的飞机：   
   The APU dc boost pump supplies fuel to the APU. The APU dc boost pump has a pump assembly and a housing assembly (not shown). The housing assembly is inside the fuel tank. The pump assembly attaches to the outside of the fuel tank. You can remove the pump assembly without defueling the fuel tank.
   
General
   
   The APU dc boost pump supplies fuel to the APU when the center and main tank boost pumps cannot supply fuel to the APU.
   
   APU DC Boost Pump On - Condition 1
   
   The APU dc pump comes on when these conditions occur:
   
   The main tank No. 1 boost pumps have low pressure and
   
   The left center tank boost pump has low pressure and
   
   The crossfeed valve is closed and
   
   The APU master switch is in the ON position and
   
   The APU fire switch is in the normal position and
   
   The ECU finds no protective shutdown faults.
   
  APU DC Boost Pump On - Condition 2
   
   The APU dc pump also comes on when these conditions occur:
   
   The main tank No. 1 boost pumps have low pressure and
   
   The main tank No. 2 boost pumps have low pressure and
   
   The center tank boost pumps have low pressure and
   
   The crossfeed valve is in the open position and
   
   The APU master switch is in the ON position and
   
   The APU fire switch is in the normal position and
   
   The ECU finds no protective shutdown faults.
   
   The fuel control module receives low pressure signals from the boost pump low pressure switches. The fuel control module also receives a crossfeed valve position signal from the crossfeed valve.

消逝的鱼

peterpollicy:对于没有DC增压泵的飞机：
The APU fuel feed system supplies fuel from any tank to the APU.

The center tank boost pumps or the boost pumps in main tank No. 1 and main tank No. 2 supply fuel to the APU. If the boost pumps are off, the APU suctions  .. (2014-09-04 16:42) 

谢谢谢谢

254724788

自身的燃油泵。

wanglei8291

APU启动后，燃油管内燃油消耗，形成负压，油箱内燃油流过来补充形成连续供油

216zhu039

看你的图，我举得也可以suction fuel from main tank NO.2

lttchainanchen

直流泵我们公司没有。