WEHAVEFUN FJ504 Spider Fuel Injector With Bracket Instruction Manual
- June 1, 2024
- WEHAVEFUN
Table of Contents
WEHAVEFUN FJ504 Spider Fuel Injector With Bracket
Central SFI Conversion to MFI (VS)
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 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
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Depressurize the fuel system by disabling the vehicles fuel pump. Consult Service Repair Manual for proper steps.
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Disconnect negative ground terminal from the battery.
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Remove Upper Intake Manifold cover and SCPI Fuel Meter Body according to Service Repair Manual procedures.
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Remove the Fuel Meter Body bracket and replace it with the updated bracket.
NOTE : Updated Bracket is sold separately -
Position Fuel Tubes of MFI Fuel Meter Body as shown in Figure 1. Fuel tubes 1, 3, 5 and 7 are oriented toward the fuel inlet side of the fuel meter body. Fuel tubes 2, 4, 6 and 8 are oriented toward the fuel pressure regulator side of the fuel meter body.
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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 until the tabs snap into the bracket locking the fuel meter body in place.
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Orient the fuel tubes to coincide with their corresponding cylinder. The fuel tubes are numbered on the side of the fuel meter body and the corresponding cylinder number is cast in the intake manifold.
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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. -
Insert the fuel injector tips into their corresponding holes in the intake manifold. Install tubes for cylinders 1, 3, 6 and 8 making sure that the injector electrical connectors are facing in toward the center of the manifold.
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Insert fuel tubes for cylinders 2, 4, 5 and 7 in the same manner.
NOTE : When installing fuel tubes, it is important that the tubes are oriented properly to provide minimal interference when installing the upper intake manifold plenum. Intake holes for cylinders 2, 4, 5 and 7 are closer to the fuel meter body. It is necessary to cross tube 7 over tube 5 and tube 2 over tube 4 as shown in Figure 2
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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. -
Reconnect the battery and vehicle’s fuel pump.
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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.
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Depressurize the fuel system and remove the fuel lines from the Fuel Meter Body.
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Lubricate the Fuel Meter Body Upper Manifold O-ring 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. -
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.