moseiny FJ503 Spider Fuel Injectors 6 Cylinder Instructions

FJ503 Spider Fuel Injectors 6 Cylinder

Central SFI Conversion to MFI (V6)

This procedure outlines the steps required to
replace the existing Central SF] Fuel System
with anew MFI (Multiport Fuel Injection) Fuel
System. Be sure to use the appropriate year
and model Service Manual for proper
disassembly and reassembly procedure(s).
Be sure to properly depressurize the fuel
system before proceeding. Extinguish all
sources of flame.

NOTE: Central SFI denotes the Fuel
System commonly known as SCPI.
Installation Instructions:

1 Depressurize the fuel system by
disabling the vehicles fuel pump. Consult
Service Repair Manual for proper steps.

2. Disconnect negative ground terminal
from the battery.

3 Remove Upper Intake Manifold cover
and SCPI Fuel Meter Body according to Service
Repair Manual procedures.

4. Remove the Fuel Meter Body bracket
and replace it with the updated bracket.

5. Position Fuel Tubes of MFI Fuel Meter
Body as shown in Figure 1. Tubes must be
oriented away from the fuel pressure regulator
end of the fuel meter body.

6. Insert the MFI Fuel Meter Body into the
Fuel Meter Body Bracket on the Lower Intake
Manifold being careful not to bind the Fuel
Tubes. Push down firmly on the fuel meter body
locking it into the bracket.

NOTE: The number 3 Fuel Tube must be
positioned behind the number 1 Fuel Tube to

eliminate interference with the Upper Intake
Manifold plenum when installed. See Figure 2.

NOTE: Make sure that the number 3 Fuel Tube
is routed in behind number 1 and 5 Fuel Tubes
from MFI Fuel Meter Body. See Figure 2.

7. Apply a coat of clean motor oil or non-
silicone lubricant to the injector tip for easier
installation.

NOTE: Injector Tips do not require o-rings for
proper sealing.

8. Insert the number 3 injector into the
correct hole in the Lower Intake Manifold first.
Install the number 5 injector next and then
number 1. See Figure 3.

NOTE: This sequence must be followed
correctly to prevent interference of the Fuel
Tubes. Injectors 2, 4, and 6 are then installed.

NOTE: The injector holes are numbered on the
Lower Intake Manifold. The injectors are
numbered on the side of the Fuel Meter Body.

9. Insure that the electrical connectors of
the injectors are positioned so that they do not
interfere with each other and are pointing
towards the center of the Intake Manifold. if
necessary, rotate the electrical connectors
inboard.

10. Temporarily reinstall the Fuel Inlet and
Return Lines into the Fuel Meter Body.

NOTE: Lubricate the Fuel Inlet and Return Lines
with clean engine oil or a non-silicone lubricant
before inserting them into the Fuel Meter Body.

11. Reconnect the battery and vehicle’s fuel
pump.

12. _ Perform a Fuel Pressure System check
to verify that the injectors are not leaking. DO
NOT ATTEMPT TO CRANK THE ENGINE OR
START THE VEHICLE. Consult Service Repair
Manual for proper Fuel Pressure check
procedures. If fuel pressure is not held, find the
cause of the problem and correct it at once.
Failure to do so can result in engine damage.

13. Depressurize the fuel system and
remove the fuel lines from the Fuel Meter Body.

14. Lubricate the Fuel Meter Body Upper
clean

Manifold O-ring (orange in color)
engine oil or non-silicone lubricant.

NOTE: Lack of lubrication will make installation
of the Upper Intake Manifold cover difficult
and may cause damage to the O-ring.

15. Replace the Upper Intake Manifold
cover gasket with a new gasket. Reinstall the
Upper Intake Manifold cover and Fuel lines,
follow the procedures outlined in the Service
Repair Manual

NOTE: Make sure that the Fuel Line Retaining
Bracket is properly oriented with the tabs
down.

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