Olds fuel pump won't shut off.
93 olds hanged ecm 2supeme s w/3.1 liter v6. fuel pump keeps running after key (ignition) turned off. check ignition switch, ok, remove relay still runs. checked wires in trunk coming from gas tank ok. changed ecm 2x car thought 1st was defective , will crank but not turn over. put back old ecm car cranks and starts right up. to shut fuel pump have to disconnect wire to battery. any help appreciated applejoe