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S-Class (W140) 1991-1999: 300 SD, S 350TD, 300 SE 2.8, S280, 300 SE 3.2, 300 SEL 3.2, S320, S320L, 400 SE, S420, 400 SEL, S420L, 500 SE, S500, 500 SEL, S500L, 600 SE, S600, 600 SEL, S600L, 500 SEC, 600 SEC

Fuel pump no power

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Old 11-01-2023, 03:22 PM
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Fuel pump no power
Hi I need help finding the fuel pump relay or the mas control module, I am working on a 1993 mb 300se the set up is battery is the trunk



I am not getting power to the fuel pumps with the key in the on position
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Old 12-08-2023, 09:18 PM
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You will only get power to the fuel pumps once the engine is cranked. This is by design such that should the vehicle be in an accident fuel pumps (yes; plural) won’t deliver a LOT of fuel to potentially damaged fuel lines under hood to fuel a raging inferno of a car-be-que.
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