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Troubleshooting Fuel System
Problem: Too Rich
Condition
1. Diagnostic trouble code activated
2. Fuel pressure too high
3. Fuel return hose obstructed
4. Injectors leaking
Problem: Too Lean
Condition
1. Diagnostic trouble code activated
2. Fuel pressure too low
3. Vent hose obstructed
4. Fuel filter(s) obstructed
Removing Oil-injection Pump
NOTE: To service the oil-injection pump, the
exhaust system and the air silencer must be
removed.
1. Remove the throttle bodies and secure them out of
the way in an upright position.
2. Disconnect the oil-supply hose from the pump and
plug to prevent oil drainage.
3. Remove the oil-delivery hoses from the intake
flanges.
4. Disconnect the oil-injection cable.
5. Remove the two screws securing the oil-injection
pump and retainer to the crankcase.
6. Pull the oil-injection pump away from the retainer/
crankcase and account for a gasket/O-ring.
NOTE: Remove the oil-injection pump from the
crankcase only if the O-ring or gasket need to be
replaced.
7. Turn the pump sideways; then remove the lower
union bolt. Account for two washer gaskets.
Remove the pump.
8. Remove the remaining union bolts securing the
check valves to the pump. Account for the washer
gaskets.
9. Remove the check valves. Account for two gaskets.
Installing Oil-injection Pump
1. In turn on each front union bolt, install a washer
gasket, check valve, and washer gasket; then
install on the oil-injection pump.
2. Place the gasket and oil-injection pump near the
engine; then install the lower union bolt through a
gasket, check valve, and gasket.
3. Position the oil-injection pump on the engine mak-
ing sure the oil-injection pump gear is correctly
aligned with the oil-injection pump drive gear.
Remedy
1. Replace problem sensor
2. Replace regulator
3. Service — replace hose — remove obstruction
4. Replace injectors
Remedy
1. Replace problem sensor
2. Replace regulator/fuel pump
3. Remove obstruction
4. Replace fuel filter(s)
4. Secure the pump with two screws (coated with
blue Loctite #243). Tighten screws to 96 in.-lb.
5. Connect the oil-delivery hoses to the intake
flanges. Secure with clamps.
6. Connect the oil-injection cable to the pump and
secure.
7. Connect the oil-supply hose to the oil-injection
pump inlet fitting. Secure with the clamp.
8. Bleed the oil-injection system.
9. Check the oil-injection system synchronization
(see Synchronizing Oil-Injection Pump). Tighten
the jam nuts securely.
NOTE: Install the exhaust system and the air
silencer.
10. Install the throttle bodies.
Synchronizing Oil-Injection Pump
NOTE: The oil pump cable adjuster is located at
the juncture of the throttle cable.
CAUTION
Use a 100:1 fuel mixture for the following procedure.
742-331A
65
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