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Are you sure it's a fuse box? On my 1999 Explorer, the fuse box under the hood is on the driver's side, up near the fire-wall. On mine there is a small tab on the back (as you face it standing on the driver's side of the vehicle) that I depress, and then the lid flips towards you.
PS. My windshield washer reservoir, and I think pump, are on the passenger side.
It's a relay box. I believe it has 3-4 relays inside. One or two for the washers and one for the fog/driving lights. Never opened one, but usually there's a part of the cover you pull or press on to release it.
I'm trying to figure out the same thing.. how do I get into that box to replace the washer relay. It's not very accessible. There are what looks like clips on the side, but I'm not sure and don't want to force anything...