After having an interrmittent problem with my 1995 E320, I have a question regarding the dual pump system. One pump was making a really loud noise (whistling, whining ), and, I had absolutley NO power over 2500 rpm. Below 2500, car worked fine. After not driving the car for a few days, now, no noise, and the car is working great. Obviously this is a short term abhoration. Okay, my question is.. how do I now know which fuel pump to replace? Do both pumps run continuously, or, when needed?

Thanks

Jeff

I don't have an answer, but I too have always wondered why some 103 engines have only one pump, and my 300TE has two-why?

And with your 104 engine, should just the noisey pump be replaced, or both?

Had that problem.


Replaced the front pump, and all was good.

__________________
-Justin

91 560 SEC AMG - other dogs dd
01 Honda S2000 - dogs dd
07 MB ML320 CDI - dd
16 Lexus IS250 - wifes dd

it's automatic.