My fuel pump runs continuously. I don't know enough about the system to decide between the cold start valve, fuel distributor, or something I am not aware of where can I start looking?

If the car is running, so is the fuel pump. What is the problem?

And BTW what is the car?

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician

300E, I was under the impression that if the pressure was up the pump would stop.

On this car & all MB's with electric pumps the pump is designed to run any & ALL of the time that the engine is running.

As Steve asked, "What is the problem"?

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

My ignorance I suppose, the pump is noisy, I am not used to an MB making noise. I have replaced the pump, and still have the noise. The car will run faster than I want to drive it, so fuel volume is adequate. With 180k miles I start to wonder. Hence the concern.