6.  
During the above test, observe for signs of external leakage.  Any leakage is cause for rejection of the regulator.  After satisfactory adjustment has been made, apply Glyptol around the threads of the adjustment screw and in the slot.

21-40-00 Page 21-34 Revised: February 28, 2002
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INSTALLATION OF FUEL REGULATOR.
1.  
Position the regulator into position between the fuel line and fuel pump.  Ascertain that the inlet side of the regulator is towards the fuel pump.

2.  
Connect the regulator to the pump and the heater fuel line to the regulator outlet port.

3.  
Connect the electrical leads from the regulator.

4.  
Operate the heater to make sure the unit is functioning properly.

HEATER FUEL PUMP. (Refer to Figure 21-15)
The maintenance required for this type of fuel pump is very limited, consisting of inspection and replacing parts that are worn or broken.
REMOVAL OF HEATER FUEL PUMP.
The heater fuel pump is located on the upper left side of the forward bulkhead assembly.  Access is obtained by lowering the nose cone.
1.  
Ascertain that the left fuel tanks are empty and the fuel selector controls are in the OFF position.

2.  
Disconnect the electrical lead from the pump.

3.  
Disconnect the fuel line from the inlet end of the pump and the regulator from the outlet end.  Cap all open fuel lines to prevent contamination.

4.  
Remove the bolts which secure the pump to its mounting bracket.

21-40-00 Page 21-35 Revised: February 28, 2002

DISASSEMBLY OF PUMP. (Refer to Figure 21-15.)
1.  
Remove the safety wire that secures the bottom cover to the pump.

2.  
Using a 5/8 inch wrench, release the bottom cover from the bayonet fittings.  Twist the cover by hand to remove it from the pump body.

3.  
Remove the filter, magnet and cover gasket.

4.  
Remove the retainer spring from the plunger tube using thin nose pliers to spread and remove ends of retainer from tube.

5.  
Remove washers, O-ring seal cup valve, plunger spring and plunger from the tube.

CLEANING OF PUMP.
1.  
Wash all pans in cleaning solvent and blow out with air pressure.

2.  
If plunger does not wash clean or if there are any rough spots, gently clean the surface with crocus cloth.

3.  
Slosh the pump assembly in cleaning solvent and blow out with air pressure.

4.  
Swab the inside of the tube with a cloth wrapped around a stick.

21-40-00 Page 21-36 Revised: February 28, 2002
1I10
INSPECTION AND REPAIR OF PUMP.
1.  
Disassemble the pump.

2.  
The filter usually comes off with the cover; it may stick inside the fuel pump.  Carefully remove the filter and replace it, if distorted.

3.  
Check cover gasket and replace if deteriorated.

4.  
Check the O-ring seal and plunger spring and replace if worn.

ASSEMBLY OF PUMP. (Refer to Figure 21-15.)
1.  
Insert the plunger into the tube with the buffer spring end first.  Check fit by slowly raising and lowering the plunger in the tube. It should move fully without any tendency to stick.  If a click cannot be heard, the interrupter assembly is not functioning properly in which case the pump should be replaced.

2.  
Install the plunger spring, cup valve, O-ring seal and washer.

3.  
Compress spring and assembly retainer with ends of retainer in side holes of tube.

4.  
Place the cover gasket and magnet in the bottom cover and assemble the filter and cover assembly.

5.  
Twist the cover by hand to hold in position on pump housing.  Using a 5/8 inch wrench, securely tighten the bottom cover with the bayonet fittings on the pump body and install safety wire.

INSTALLATION OF HEATER FUEL PUMP.
1.  
Position the fuel pump on the forward bulkhead assembly and secure in place with bolts.

2.  
Connect the regulator to the pump outlet and the fuel line to the pump inlet.

3.  
Connect the electrical lead from the pump.

4.  
Operate the heater to make sure the unit is functioning properly.

5.  
Replace nose cone and secure.

DUCT SWITCH. (Refer to Figure 21-19.)
1.  Removal:
A.  Disconnect the electrical leads from the terminals on the exposed face of the switch and mark to facilitate installation.
B.  Remove the two attaching screws and washers from the duct switch bracket.
C.  Carefully lift out the switch and gasket (if gasket is used).
　
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