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Interesting, my '95 E320 wagon just started doing this a week and a half ago. It doesn't happen constantly, but every few days I notice the fuel pump sounds like it's having to work harder by being noticably loud. During these episodes the car exibits a very interesting behavior. It drives fine except when making right turns. After a right turn if I get on the accelerator more than ~30%, the engine stumbles for a few seconds then clears up. Later in the day, on subsequent restarts the fuel pump is silent again and does not exibit the stumbling problem at all.
I ordered a new fuel filter and will be changing it out tomorrow. Hope that takes care of it.
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