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Fuse panel is drivers side panel next to your left leg (near door). The fact that you can hear the main pump humming means the fuse isn't completely blown, but it could be providing intermittant contact (corroded) - You Might want to pull the fuse out and check both ends - but just rolling it back and forth in the copper contacts should allow it to get a better contact with the ends where it connected.
The pump inside the tank (often refered to as the lifter pump) primarily raises the fuel out of the tank - so it is easier for the main pump to push it to the fuel rails (read engine compartment). If you have a healthy main pump - it will often pull the fuel out down to a half a tank or less even with a dead internal pump. Below a half tank, the internal pump is necessary to get at the fuel (hence everyone's questions about how much fuel was in the tank).
I would originally have suspected the internal pump (as this one seems to be a regular problem) but you said that you're getting the problem even with a nearly full tank.
Based upon the whine you mention (and the fact that it is occurring with a full tank - I'm suspecting the main fuel pump is "going" and that your repair shop charged you for work that they didn't perform. (Are you sure they changed the "oil filter" and not your "fuel filter" ???) Also Check the hoses (as previously stated) before going out and purchasing a new fuel pump. With that many miles, it could be any of the above parts.
(with most other cars - after 250,000 it would be needing a new engine!!!)
Hope that helps
Charles
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