Quote:
Originally Posted by wazzz
This SS relay wouldn't fit. If you look at the details, it is a SPST, that is just a simple switch, while the fuel pump relay needs a SPDT, which is a crossover switch between two lines. Look at the schematic posted above.
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Ok, I see that now. My mistake. I didn't look at the diagram initially as I thought you'd posted a diagram of how the F9 works.
the 87a terminal and associated yellow wire are part of the starting circuit. the yellow (bus 50) wire receives power during cranking and ensures the fuel pump runs during the cranking phase before the airflow sensor contact closes and grounds the trigger coil in the relay.
the easiest solution would be to use a
diode to supply power to the fuel pump during cranking and the Hella SS relay to supply power during running.
below is a quick sketch of the circuit with the Hella relay and diode wired to the original relay socket.
