Q: fuel pump relay always cut off from Ecu(Ecm) on 1995 Mercedes-Benz S320

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
fuel pump always cuts off and check out by bypassing relay and car still starts.but the voltage feed wire to the relay shuts off,I suspect from the computer.After few hours vehicle start up again.This will run for few more Km/Ml then it shuts itself same thing relay disconnected.
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