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Fuel Pump Replacement
1. Remove any airframe components required to
gain access to the fuel pump in accordance
with the airframe manufacturer's instructions.
Remove the following hoses from their fittings
on the fuel pump and install protective covers
on the hose ends. Identify fuel line location for
proper reinstallation:
a. Airframe to engine fuel connections in
accordance
manufacturer's instructions.
b. Vapor return hose
c. Turbocharger discharge pressure reference
hose.
d. Fuel outlet (unmetered pressure) hose.
2. Remove mixture control cable connection in
accordance with the airframe manufacturer's
instructions.
3. Remove the nuts and washers that hold the fuel
pump on the crankcase:
a. 2 plain nuts
b. 2 lock washers
c. 2 hold down washers
Discard lock washers.
CAUTION...
Do not allow the coupling to fall into the
crankcase. If it does, you must retrieve it before
proceeding.
4. Carefully remove the fuel pump, coupling, and
gasket.
5. Discard gasket.
6. Inspect hoses for condition. Replace any hose
that exhibits wear or deterioration.
7. Discard worn or damaged parts.
8. The fuel pump can be replaced or repaired and
calibrated in accordance with the applicable
instructions in the Fuel Injection System Parts
And Overhaul Manual, Form X30593A, latest
revision.
9. Fittings from the original fuel pump may be
installed and oriented to the same position in
the replacement pump.
(continued)
with
the
airframe
CAUTION...
Never use Teflon tape on fuel injection system
fittings.
10. The fittings must be clean and free of damage
and debris prior to installation. Apply F/I
sealant to tapered male threads in accordance
with Figure 9-6. Install fittings in fuel pump
and orient to the original positions.
11. Apply a small amount of Gasket Maker to the
crankcase split lines above and below the fuel
pump bore.
12. Apply Molyshield Grease to the coupling
receptacle on the fuel pump.
13. Insert the fuel pump coupling into the coupling
receptacle on the fuel pump. Insure that the
coupling is fully seated.
14. Install the gasket on the crankcase fuel pump
bore studs.
15. Install the fuel pump on the crankcase by
sliding the fuel pump on the fuel pump
mounting studs while carefully guiding the
fuel pump coupling into the square hole in the
crankshaft gear.
16. Install hold-down washers, new lock-washers,
and nuts on each stud.
17. Torque the fuel pump nuts to 180 - 220 inch
pounds.
18. Install turbocharger discharge pressure hose
and fuel hoses on fuel pump. Torque fuel
pump hose connections in accordance with
Table 2, "Torque Specifications for Hose
Fittings."
19. Reinstall cowling and airframe accessories in
accordance with the airframe manufacturer's
instructions.
Fuel System
9-15
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