Fuel pump replaced 2 years ago and a filter replaced 6 months ago....I'd say you better properly diagnose the problem before you throw parts at it. Prime the pumps and crack open the main fuel line to see that fuel is indeed being passed by the pumps. If it does, check everything from that point forward. If fuel seems to be reaching the injectors, try to check the air.

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1990 190E 3.0L