On 1990 models Chrysler was not using a separate fuel pump relay to power the electric fuel pump. It was powered by the ASD (automatiic shut down) relay. AS Bob L mentioned it should be located on the inside fender well area. Have someone turn the ignition switch to the RUN position from OFF but do not start the engine. You should feel the ASD relay click if you place your hand on the outside of the relay case.
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