325D high pitched humming

smithy79 · 02-09-2015, 07:40 AM

Hi
Last week my car started to produce a high pitched humming noise from what seems to be around the back right of the car. It is a constant humming, and does not change in speeds and it there at idle? I cant see any change in the cars performance?
Does anyone have any ideas, before i get it checked.
Thanks
Mark

Phil325i · 02-09-2015, 08:02 AM

The facts it's there when the car is at rest rules out all the usual suspects like tyres, wheel bearings, seized calipers etc. Only source of a noise like that at the rest I know of is the low pressure fuel pump. I think you need to get the car up on a ramp and have a listen...

EDIT - just realised you have a diesel. Not so sure what the fuel pumping arrangements are on the diesel. On petrol cars there is a two-stage process - low pressure pumping from the rear and a high pressure pump in the engine bay.

kiel_dafo_kenyg_as · 02-09-2015, 12:15 PM

You may have a vacuum in the tank. When the humming is back pull the tank cap and see if it stops.

Oneeb · 02-09-2015, 03:20 PM

I had a constant high pitched whining type noise coming from the right back, turned out to be the fuel filter.

Previous owner didn't change it when it got serviced and so it was getting blocked.

02-09-2015, 07:40 AM	#1
smithy79 Enlisted Member 1 Rep 38 Posts Drives: E92 325d M Sport Coupe Join Date: Oct 2013 Location: UK iTrader: (0)	325D high pitched humming Hi Last week my car started to produce a high pitched humming noise from what seems to be around the back right of the car. It is a constant humming, and does not change in speeds and it there at idle? I cant see any change in the cars performance? Does anyone have any ideas, before i get it checked. Thanks Mark
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02-09-2015, 08:02 AM	#2
Phil325i Brigadier General 616 Rep 3,194 Posts Drives: E92 325i MSport Coupe Join Date: Apr 2012 Location: UK South East iTrader: (1) Garage List 2009 BMW 325i Coupe [6.00]	The facts it's there when the car is at rest rules out all the usual suspects like tyres, wheel bearings, seized calipers etc. Only source of a noise like that at the rest I know of is the low pressure fuel pump. I think you need to get the car up on a ramp and have a listen... EDIT - just realised you have a diesel. Not so sure what the fuel pumping arrangements are on the diesel. On petrol cars there is a two-stage process - low pressure pumping from the rear and a high pressure pump in the engine bay. __________________ E92 pre-LCI 325i - Ohlins R&T; H&R spacers; M3 strut brace; Swift thrust sheets; 3 x chassis braces; diff brace; N53 V-brace; 034 subframe inserts; BMS clutch stop; BMS CDV; RE g/box mounts; Delrin shift bushes; Saikoumichi OCC; Cyba scoops; BMW Perf Exhaust; HEL s/steel brake hoses; M3 rear spoiler; Recaro Sportster CSs; M3 white dash LEDs; LED Angels; LED side repeaters; BMW Perf black grille; CSL reps; SSDD carbon diffuser; Monster Wrap black roof/clear front
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02-09-2015, 12:15 PM	#3
kiel_dafo_kenyg_as DIE ANTWOORD 68 Rep 640 Posts Drives: 335d E92 Join Date: Jul 2014 Location: Bimmer's home - Bavaria iTrader: (0)	You may have a vacuum in the tank. When the humming is back pull the tank cap and see if it stops. __________________ King of the road says you move to slow
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02-09-2015, 03:20 PM	#4
Oneeb New Member 1 Rep 16 Posts Drives: BMW 330d Join Date: Aug 2014 Location: Dudley iTrader: (0)	I had a constant high pitched whining type noise coming from the right back, turned out to be the fuel filter. Previous owner didn't change it when it got serviced and so it was getting blocked.
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