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Old 02-04-2008, 11:56 AM
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Join Date: Apr 2000
Posts: 75
w124 Dual Fuel Pump Question

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?



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Old 02-04-2008, 12:57 PM
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Join Date: May 2006
Posts: 590
Yes, why two?

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?
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Old 02-04-2008, 02:38 PM
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Join Date: Nov 2003
Location: Hella NorCal
Posts: 3,313
Had that problem.

Replaced the front pump, and all was good.


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.
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