noise in new 128 coupe

arthur1920 · 11-28-2012, 01:00 PM

I have a new 128 coupe, M sport.

The car is kind of noisy in generals. It seems like i can ear each pebble bouncing of the bottom of the car.

I hear two unusual noises. There is a soft "pha-lump" noise I hear like you took a phone book, held it by the binding, and swatted the underside of the floor pan with the loose end. I am driving gently when I hear this.

The second noise, I hear after I shut off the car. I hear a faint high pitched whine..no, not the radiator fan. It sounds like it could be an electric fuel pump, also, the sound is coming from the back of the car underneath. Is the fuel pump inside the tank? Doesn't do it every time, just some times.

Anyone hear these noises? Know what they are?

TIA

KingOfJericho · 11-28-2012, 01:23 PM

I believe the latter is your fuel pump.

bmw1racer · 11-28-2012, 09:55 PM

Quote:

Originally Posted by KingOfJericho

I believe the latter is your fuel pump.

Yup... I hear the same thing after shutdown.

BenDiem · 11-29-2012, 12:08 PM

^^^ me too. It's normal... My X3 makes the same noise.

arthur1920 · 11-29-2012, 07:31 PM

Quote:

Originally Posted by KingOfJericho

I believe the latter is your fuel pump.

Why in the hell would it be designed to do that?

Dackelone · 11-29-2012, 08:53 PM

Quote:

Originally Posted by arthur1920

Why in the hell would it be designed to do that?

So the fuel at the fuel rail doesn't boil and cause vapor lock. The fuel pump will recirculate the fuel in the system/rail. Those crafty Germans!

Bill B. · 11-29-2012, 09:01 PM

Quote:

Originally Posted by arthur1920

Why in the hell would it be designed to do that?

What you are hearing is probably the evap system leak detection pump performing a leak test. It creates a slight vacuum in the tank and monitors for leaks. If found, it sets a code.

arthur1920 · 11-29-2012, 09:14 PM

thanks for the suggestions.

I hate the **** govt for making it necessary to put this crap on my car.

11-28-2012, 01:00 PM	#1
arthur1920 Enlisted Member 0 Rep 36 Posts Drives: 128 coupe, M Sport, 6 MT Join Date: Oct 2012 Location: New England iTrader: (0)	noise in new 128 coupe I have a new 128 coupe, M sport. The car is kind of noisy in generals. It seems like i can ear each pebble bouncing of the bottom of the car. I hear two unusual noises. There is a soft "pha-lump" noise I hear like you took a phone book, held it by the binding, and swatted the underside of the floor pan with the loose end. I am driving gently when I hear this. The second noise, I hear after I shut off the car. I hear a faint high pitched whine..no, not the radiator fan. It sounds like it could be an electric fuel pump, also, the sound is coming from the back of the car underneath. Is the fuel pump inside the tank? Doesn't do it every time, just some times. Anyone hear these noises? Know what they are? TIA
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11-28-2012, 01:23 PM	#2
KingOfJericho Major General 2452 Rep 7,341 Posts Drives: Yes Join Date: Aug 2007 Location: CT iTrader: (1) Garage List 2010 135i Coupe [5.26]	I believe the latter is your fuel pump. __________________ The views and opinions expressed in this post are those of the author and do not necessarily reflect the official policy or position of Bimmerpost. 2018 Jeep Grand Cherokee High Altitude Hemi \| 2010 S4 Sold \| 2010 BMW 135i Retired \| 2006 Lotus Exige Sold
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11-29-2012, 12:08 PM	#4
BenDiem Private First Class 76 Rep 184 Posts Drives: '19 M240i xDrive Join Date: Mar 2011 Location: OH-10 iTrader: (0)	^^^ me too. It's normal... My X3 makes the same noise.
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11-29-2012, 09:14 PM	#8
arthur1920 Enlisted Member 0 Rep 36 Posts Drives: 128 coupe, M Sport, 6 MT Join Date: Oct 2012 Location: New England iTrader: (0)	thanks for the suggestions. I hate the **** govt for making it necessary to put this crap on my car.
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