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730d noise behind rear seat

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mswatton View Drop Down
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Location: Eastbourne
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    Posted: 16 Oct 2020 at 1:05pm
Hello, I'm new to this forum having recently bought a 2007 730d SE which I am really enjoying!

I have had it since January this year. After about six weeks ownership I noticed a light 'pump' type noise when pushing in the ignition key. It would last about 10 seconds the stop. I thought it might be a fuel pump but I believe the actual pump is below the rear seat swab. The noise appears to be coming from behind the o/s rear seat back and you can also feel it there if you put your hand on the back rest. 
After about two weeks, the noise stopped however it returned about 4 weeks ago. I have had a couple of garages listen to it but they didn't know what it was.

There are no error codes coming up and there is no affect on the running in anyway.

Has anyone come across this issue before or does anyone know what is behind the back seat which may give a clue to what the noise is?

Many thanks 
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