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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > 2012-2019 BMW 3 and 4-Series Forums > General F30 Sedan / F32 Coupe / F36 Gran Coupe Forum > 2017 340ix Knocking Noise When Gas Tank is Below 1/4 Full
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      09-23-2017, 11:29 PM   #23
smrtphusr
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Well when I posted my thread no one really cared so I took the car to the dealer and its normal sound. Just fuel pump working

http://f30.bimmerpost.com/forums/sho....php?t=1410955
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      09-23-2017, 11:58 PM   #24
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Quote:
Originally Posted by smrtphusr View Post
Well when I posted my thread no one really cared so I took the car to the dealer and its normal sound. Just fuel pump working

http://f30.bimmerpost.com/forums/sho....php?t=1410955
Thank you! I did a search but your thread didn't show for some reason. But thank you for letting us know what your dealer told you and the fact that they checked another car on the lot and got the same results. I guess that will allow us to rest easier knowing it's nothing serious, although a bit annoying.
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      09-24-2017, 03:09 AM   #25
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I will listen for this noise the next time my racing light comes on (low fuel light).
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      09-24-2017, 09:03 PM   #26
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Quote:
Originally Posted by smrtphusr View Post
Well when I posted my thread no one really cared so I took the car to the dealer and its normal sound. Just fuel pump working

http://f30.bimmerpost.com/forums/sho....php?t=1410955
If BMW considers this sound is really normal...I really don?t know what to say.
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      09-25-2017, 10:09 AM   #27
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Its only when gas tank is 1/4 full dont hear it other times
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      09-25-2017, 01:41 PM   #28
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This is intriguing, will try to get to 1/4 tank and confirm.
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      09-25-2017, 01:55 PM   #29
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This is intriguing, will try to get to 1/4 tank and confirm.
I my case, you need to get to about 1/8 tank or less. Basically my noise started when the car warned me that I had less than 30 miles of fuel left.
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      09-25-2017, 01:57 PM   #30
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If BMW considers this sound is really normal...I really don?t know what to say.
Yup. I hear you. This noise should never occur. I have owned many cars before and none have made such a noise when the tank was low. My 2015 335ix that I traded didnít make this noise either.
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      09-25-2017, 11:23 PM   #31
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The B58 in the 340i has its quarks. I think the most worrying is the cold start warm up then engine shake after about 30 seconds. Regardless you'll go nuts chasing all these little noises that wind up always meaning nothing.
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      10-05-2017, 04:51 PM   #32
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So I got my car back from the dealer today, noise confirmed.

Unfortunately I was told that the noise is normal and is "within BMW spec", whatever that means. The noise is from the "fuel pump return".

I'll just have to turn up my radio I guess and keep the tank full.
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      10-06-2017, 06:05 AM   #33
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Quote:
Originally Posted by KGB_123_99 View Post
So I got my car back from the dealer today, noise confirmed.

Unfortunately I was told that the noise is normal and is "within BMW spec", whatever that means. The noise is from the "fuel pump return".

I'll just have to turn up my radio I guess and keep the tank full.
Thank you for the update. I canít believe thatís normal but that seems to be what we will get told unless it causes drivability issues. Iíve been paying close attention and the noise can be ever so slightly heard at slightly below 1/8 full in my car. Iíve made it a point to just fill up before that point now to not hear it anymore.
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      10-07-2017, 07:45 PM   #34
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i haven't experienced this on my car, but i was figuring if it was either a return or Purge valve. on volkswagens with the TSI engine, the valve is mounted to the intake manifold and sounds like marbles clanging together.
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