Does a w201 have 2 fuel pumps??? - PeachParts Mercedes-Benz Forum

JB380SEL · #1 01-27-2010, 07:16 PM

I just got under the rear of my 1989 190E to change the fuel pump but for some reason there are two. Correct if I'm wrong because I do not know why there should be two or how to test which one is bad.

I have located the accumulator, filter and pump but there is an additional pump.

pawoSD · #2 01-28-2010, 12:33 AM

Yes there are two pumps, they work in tandem. If one dies the car will not run.

Earlier cars (pre-88 I believe) had only one pump.

My sister's W201 and my W124 both have two pumps.

JB380SEL · #3 01-28-2010, 04:03 AM

Thanks. However the car does run so now I don't know if I should change them.

Ivanerrol · #4 01-28-2010, 05:42 AM

Some symptoms of a fuel pump on the way out.

Noisy buzz from pump.

Intermittent fuel starvation - indicated by engine miss or stalling.

Low power.

The fuel system should be pressure tested to diagnose these problems.

If there is a slight leak at the fuel pump area then air could be getting into the system causing low power or rough idling.

JB380SEL · #5 01-28-2010, 11:29 PM

Thank you guys for your help. I am going to purchase another pump so I change both at the same time.

Does anyone know why Mercedes made the change from 1 to 2 fuel pumps???
I have been trying to think of some logical reason for the design but I am drawing a blank.

Just wondering...

Ivanerrol · #6 01-29-2010, 07:19 PM

KE is critical for correct running on fuel pressure. Two be sure, two be sure.

While you are spending cash make sure you get a new filter. (there's another filter at the entrance to the fuel distributor make sure you change that as well).