[W126 Coupe] Buzzing Fuel Pump

[Dick Spellman]

Hi Dave,

If you notice the buzz while sitting in the car and it's either 
noticeable for the first time or louder since the fuel filter was 
replaced, it's a good indicator that the pump is at the end of it's 
life.  Time for a new one. I've also just had them start buzzing loudly 
as cold weather has set in.  Again time for a new pump.

Dick

DCrawford at tompkinsinc.com wrote:

> Perhaps someone can give me advice regarding the fuel pump on my "84 500SEC.

> I recently had the fuel filter replaced as a part of a routine maintenance

> visit to my local MB shop.  When I got the car back I discovered the fuel

> pump was now continuously humming/buzzing.  The shop said it is not uncommon

> for buzzing to occur and that it was not an indicator that the pump was

> beginning to fail.  At roughly $250 for the pump plus labor, I'd put up with

> the noise if I were sure it was not getting ready to fail - I do not want to

> get stuck somewhere in the boonies in the middle of the night.

>

> Any opinions about what the best course would be or past experience with this

> type of problem?

>

> Thanks for all the help,

> Dave C