GM Fuel Pump control scheme

[Brent]

My Helms says that the oil pressure switch is a safety backup in case the
ECM fails.

HTH,
Brent
----- Original Message -----

> I'm trying to understand something about GM's fuel pump power circuit on
> both the '730 ECM.     In the diagrams that I have the pump can get power
> either from the ECM controlled fuel pump relay, or from the switch
> controlled by oil pressure.  The '747 appears to do the same thing.
>
> If the pump runs whenever ignition pulses are present, then what's the
need
> for the oil pressure switch?
>
> -> Bob Valentine
> -> bob at tecmark.com



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