there was a humming noise come from the back seat area... so
suspected the fuel pump and put in a nea one... But the noise did not
go away. I then changed the fuel sending unit on the left side
because the noise seemed to be coming from there. But the noise did
not go away... Before doing anything else I want to know what else
should I check... or what else could it be that is causing that noise
Does it make the sound with the gas cap off? You can sometimes get
funny noises from the tank venting system.
If it is the fuel pump, it will usually be much louder when the tank
is low than when the tank is full.
Some fuel pumps are just noisy. Life is like that.
"C'est un Nagra. C'est suisse, et tres, tres precis."
the noise it just there all the time. 10 seconds after starting the
car the noise starts up.... It is coming from the gas tank area. And
is muffled a little when the sound deadening pad is replace onto the
fuel pump access cover plate. but its there even in park
Fuel pump then - look for a leak and bleed the line.
Is there any sort of a pressure switch which should switch it off once
satisfactory pressure is achieved?
PS my third 735i used to whirr for a few seconds after switch on while it
pressurised the fuel line - it was best to wait for this to end before
trying to start the engine.
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