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No it's not tied to oil pressure, many people believe this, but not true.
More than likely it's a bad fuel pump relay. It is between the double firewall area behind the engine on your type of MB.
There are two relays that look about the same.
One of them says "Klima", that's NOT it, it's the other one, it should show an engine RPM and also say "8 zyl" (cylinder) on it. You could jump 2 of the sockets on the plug-in to see if you can get power to the pumps that way, but just for testing, don't leave it plugged in that way.
Gilly
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