tor888

Aloha....I was wondering if anybody with a Bluetec notices the DEF pump whine (not high pitch noise just very noticeable) immediately after turning the vehicle off.

Any feedback would be greatly appreciate....

Mahalo,
Tor

Plutoe

DEF pump--------post your VIN!

tor888

Awesome...sent you a PM. Let me know if you need anything further....

larrypmyers

The def pump runs with the engine shutdown?

Plutoe

Your answer is in this document--------https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&u act=8&ved=0ahUKEwic4Oy8gYfUAhXCOCYKHdgHBfcQFggrMAE &url=http%3A%2F%2Fautocats.ws%2Fmanual%2Fsdmedia%2 Fmediadb%2Fmb_Acrobat%2Fbluetec%2Fpkw%2F2009_07_00 2_001_en.pdf&usg=AFQjCNG0XH_tpf5KQf6R64dTBjD9zdJfZ g

tor888

Hi Plutoe...some reason I can't get your link to work. Would you mind attempting to send again?

Thanks...Tor

andreigbs

I don't notice any DEF pump noise at all.

Might it be nearing empty?

tor888

Hi andreigbs....it's like this full DEF and honestly noticed as soon as I had the car. Brought to service twice and they say they do not notice anything. Very frustrating... I wonder if anybody else out there notice and noise after car is turned off in the rear of car.

I'm saying DEF pump but could be another pump or something else but you can hear it for good 10 seconds or so after car turned off.

We are here on Big Island of Hawaii and the GLK's we see are 350 so I would love to ask can I hear your car turn off...wow i must be some car sicko....lol

andreigbs

Wondering if perhaps it might be a fuel pump in the tank, under the seat. There is a high pressure fuel pump in the engine bay but there is also be a sending fuel pump which primes the fuel system every time you switch the ignition on.

Do you notice it more with a full fuel tank or empty?

tor888

Hmm, I would have to say I notice on a regular basis. I try and not let her get low on fuel on a regular basis. So I'm thinking its all the time. You for sure notice the sound a lot more when you go to the rear of the car.

I'm wondering if I can record it and post it here. Yep, thats what I will try and do tomorrow.

Thanks all for your responses.

Tor

Clapforcanada

Hi Tor, were you able to figure this out at all? I've noticed a whine coming from mine for 5-10 seconds after shutoff as well.

Thanks!