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#1
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Weak Fuel Pump
Could a weak fuel pump cause fuel starvation to the point where the car actually vibrates when trying to accelerate? This has occurred sporadically when accelerating from 2000 rpm at 35-40 mph or so. I've assumed that the driveline was somehow out of balance. The fuel pump has been making a much more noticeable "whirring" noise when listening to it from outside at the right rear of the car. I listened to another c280 i have access to side by side and the fuel pump very quiet and hardly discernable. Impending pump doom and stranding? Of course, I will try to get it to my mechanic as soon as possible.
P.S. I switched out the fuel pressure regulator between the 2 cars and not much difference in my car, and none in the other. |
#2
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Obvious question, but have you replaced the fuel filter recently? That can cause both pump noise and starvation you describe.
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Marty D. 2013 C300 4Matic 1984 BMW 733i 2013 Lincoln MKz ![]() |
#3
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Yes, just replaced 1000 miles ago. Changed every 30k prior to that.
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#4
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Then it is probably the pump itself going bad. The only other thing that happens is over time the rubber shock-mounts that the pump assembly hangs from get brittle and do transmit more vibration to the car then when they are new. I usually just replace them as a matter of course when I replace a pump since they only cost a couple dollars and this way I can rest easy knowing I have done all I can do to quiet them and keep them hanging.
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Marty D. 2013 C300 4Matic 1984 BMW 733i 2013 Lincoln MKz ![]() |
#5
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I believe my fuel pump is the "in the gas tank" style?
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#6
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I am pretty sure yours is like just about every other MB, mounted under the rear right fender area. There is a plastic cover held on by 3 screws and the pump and filter is under there...
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Marty D. 2013 C300 4Matic 1984 BMW 733i 2013 Lincoln MKz ![]() |
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