I have a 84 Mercedes 380SE. When I turn the key on I dont hear a buzz from the pump. Where is the relay located and what does it look like? Is there just the 1 fuel pump located near the tank or does it run a second near the engine? Does someone have a diagram of the fuel system and the electronics under the hood??

Thank you

Not sure about the relay, but the fuel pumps (there are two) are under the rear seat, outside the car, under a plastic cover.

Should run when cranking, don't know if they do the 1 sec buzz at at start or not.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!

Somebody must know where the relay is located and what it looks like. I cant seem to find it anywhere. The fuel pumps dont buzz!

On a 1989 420SEL the fuel pump relay is between the 2 firewalls, the one closest to the passenger side. It is rectangular box. My fuel pumps do not buzz and they are brand new. My old pumps buzzed, and then one started to scream, which motivated me to replace both pumps..

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1989 420 SEL