Central SFI Conversion to MFI (V6)
This procedure outlines the steps required to replace the existing Central SFI Fuel System with a new MFI
(Multiport Fuel Injection) Fuel System. Be sure to use the appropriate year and model Service Manual for
proper disassembly and reassembly procedures. 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 vehicle's 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.
NOTE: Updated Bracket is sold separately.
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 1.
NOTE: Make sure that the number 3 Fuel Tube is routed in behind number 1 and 5 Fuel Tubes as
shown in 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 Manifold O-ring (orange in color) with clean 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.
Please view our 'Central SFI Conversion to MFI (V6)' instructional video prior to product
installation. You can access the video by scanning the QR code with a mobile device or by
entering www.youtube.com/InstallSpotlight into your browser and selecting Central SFI
Conversion to MFI (V6) Playlist.
Avant d'installer le produit, nous vous recommandons de visionner notre vidéo didactique sur la
conversion d'un système d'injection SFI en système MFI (V6). Pour accéder à la vidéo, il suffit de
balayer le code QR au moyen d'un appareil mobile ou d'entrer dans votre navigateur l'URL
www.youtube.com/InstallSpotlight, puis de sélectionner la liste d'écoute Central SFI
Conversion to MFI (V6).
Por favor, mire nuestro video instructivo "Conversión de SFI central a MFI (V6)" antes de instalar
el producto. Usted puede acceder al video escaneando el código QR con un dispositivo móvil o
ingresando a www.youtube.com/InstallSpotlight en el explorador que utilice y seleccionando el
listado de Conversión de SFI central a MFI (V6).
Figure 1
Position behind #1
Fuel Tube
Figure 2
Figure 3
Scan this code for installation video.
Balayez ce code pour voir la vidéo
d'installation.
Escanee este código para ver el
video de instalación
GF10853