(c)  
Remove and discard the O-ring from the drain plug.

 (d)  
Loosen the fuel inlet line at the strut disconnect panel
 sufficiently to let the air enter the fuel inlet line.

 NOTE: Put a funnel or a container below the line connection of
____ the fuel inlet. Do not let the fuel fall on the fan case.
 (e)  
Lubricate a new O-ring with the petrolatum.

 (f)  
Install the new O-ring on the drain plug.

 (g)  
Apply a thin layer of graphite grease on the threads of the
 drain plug.

 (h)  
Install the drain plug.

 1)  Tighten the drain plug to 45-55 pound-inches
 (5.1-6.2 Newton meters).

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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
2) Install a lockwire. S 034-018-C00
 CAUTION:_______ USE TWO WRENCHES TO REMOVE TUBE COUPLING NUTS, ONE TO HOLD THE
 FITTING AND ONE TO LOOSEN THE COUPLING NUT.  THIS WILL PREVENT
 DAMAGE TO THE HARDWARE.

 (10) Remove the plumbing lines from the outboard side of the MEC that follows (Fig. 405, Sheet 1):
 (a)  
Disconnect the fuel outlet line at the MEC DISCHARGE port.

 (b)  
Remove the clamp block for the drain line installed below the MEC.

 (c)  
Loosen the clamp blocks downstream of the MEC.

 (d)  
Disconnect the drain line for the main oil/fuel heat exchanger.

 1)  Move the drain line forward and attach it to the accessory gearbox (AGB).

 (e)  
Disconnect the lower overboard drain line from the 45° elbow fitting below the MEC fuel control box. 1) Move the drain line down and forward and attach it to the

 line you removed above.

 (f)  
Disconnect the drain line for the starter case.

 1)  Move the drain line down and attach it to the lines you removed above.

 (g)  
Disconnect the floating clamps from the upper overboard drain line and the OIL-IN line. 1) Do not remove the clamps.

 (h)  
Disconnect the upper overboard drain line from the 90° elbow fitting on top of the MEC and behind the servo fuel heater. 1) Move the drain line down and forward and attach it to the

 lines you removed above.

 (i)  
Remove the OIL-IN line that goes from the main oil scavenge filter to the servo fuel heater (outboard side) (Fig. 405, Sheet 2). 1) Disconnect the clamps 1 and 2 from the bracket behind the

 MEC.
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////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FUEL PUMP ASSEMBLY 
SEE  A  PBP BLANKING 
PLATE 
1  3 

PUSH-PULL CABLES
ELECTRICAL CABLE AND SUPPORT TUBE
FUEL OUTLET
LINE

PB LINE 2 ELECTRICAL CABLE
OIL RETURN LINE
MAIN OIL/FUEL

HEAT EXCHANGER SEE B
DRAIN LINE 4 OIL-IN LINE
STARTER CASE FLOATING CLAMPS
DRAIN LINE UPPER OVERBOARD PBP
DRAIN LINE ELBOW
FUEL FILTER LOWER OVERBOARDDRAIN PLUG DRAIN LINE
FWD
PRESSURIZING VALVE
FUEL PUMP ASSEMBLY
(LOCATED AT THE 8:30 O'CLOCK POSITION)

1 INSTALLED ONLY ON ENGINES  A 3 ENGINES WITHOUT THE PBP ELBOW
WITHOUT THE HPTCC TIMER
ON THE FUEL PUMP HP HOUSING 2
INSTALLED ONLY ON ENGINES 4 ENGINES WITH THE PBP ELBOW
WITH THE HPTCC TIMER ON THE FUEL PUMP HP HOUSING
Fuel Pump Package Outboard Plumbing Line Installation
Figure 405 (Sheet 1)

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