How can remove the rear seat on a 1990 mercury sable
Yes, but you'll have to pull the plenum first.
Yes
According to my Chilton's Auto Repair Manual : For a 1990 Mercury Sable : ( 16.0 U.S. gallons or the optional extended range tank which is 18.6 )
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In the relay block with the other relays.
On a 1990 Mercury Sable : The ELECTRIC fuel pump is INSIDE the fuel tank ( it is installed through an access hole in the top of the fuel tank )
Usually that would be the case, however their are variations in both cars.
Take it to a shop
1990
Go online to any auto parts store and look up the alternator for both the 1990 and the 1999. If the part number is the same you're good to go.
you have to go under the dash and take out the steering column. and the ignition switch should have a wire going down to the bottom of the column coming from the ignition lock.