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Home >> Geo >> 1990 >> Prizm Base, 4D Hatchback, Standard >> Repair and Diagnosis >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Fuel System >> Fuel Delivery >> EFI Main Relay

EFI Main Relay

EFI main relay supplies voltage to circuit opening relay when ignition is turned on. The ECM controls the fuel pump relay for fuel pump operation.

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