Car whining before startup

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Hi, i just picked up a 1998 VW golf with 130,000 miles on it. I've noticed that when I turn the key to the on position, there is a high pitch noise that stays on for 30-45 seconds and then goes away. I can't hear it once I start the car. No starting issues so far. Any suggestions? Thanks
 
30-45 seconds though for a fuel pump?

I've never heard a fuel pump run pre-ignition for longer than 3-5 secs. If it's running 30-45 seconds something probably isn't right. But I'm not expert.
 
I'm pretty sure it is just a systems check. Appears that VW cars used to do the checks when the car was turned on. The current generation does the checks when you turn the key off
 
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