Fuel pump diagnosis chart

 

TYPICAL FUEL PUMP RELAY CIRCUIT

1986-89 SHOWN, 1985 (ECM 1226870) USES SAME PINOUTS

 

1990-92 FUEL PUMP CIRCUIT (ECM 1227730) F BODY

1990-91 FUEL PUMP CIRCUIT (ECM 1227727 ) CORVETTE 

 

 

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