IH1 pin 6 is for fuel pump speed control, I'd have to look up my mx83 diagrams to determine what pin that needs connection to.
IH1 pin 4 is the actual "control" for the fuel pump, comes from the FC pin on the ECU. In the mx83 the AFM switched this circuit so you need to wire it to the MX83 grey plug pin 15
I'd also ensure you hook up the W pin from the ECU to the MX83 check engine light.
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