Thanks to everyone who responded. It is indeed the in-tank fuel pump. There is
a fuse for the fuel pump in the main fuse block. If I remove the fuse the noise
goes from S8 to S3.
I have the maintainance manual for this car and I thought I would be able to
find something showing where the pump wiring exits the tank but I guess they
figure everyone knows that.
I'll let you all know how the filter experiment goes once I find the pump
wiring.
- Bill
-- 
=====================================================================
#  Bill Putney - WB6RFW            | My repeater:443.400 Mhz-100 Hz #
#  WWPC                            | It's not open, it's not closed,#
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#  Oakland, CA 94619               | membership (which is free...). #
#  billp@wwpc.com - (510)531-2412  | Go figure...                   #
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