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· BenzWorld W126 & W201 Host
1988 420SE, 2002 C180 Kompressor, 200 ML320
1,150 Posts
Fuel pump relay


The fuel pump relay is a common fault.
when you turn the ignition on but don't actualy crank the engine, you should hear the fuel pump run for about 2 seconds and then shut off. This primes the system.
if you don't hear any noise, either the pumps broke or the relay is not working.
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