there are 3 clips in trunk that have to be released by squeezing and pushing up that would be easier if you had a friend to help you and pull up from inside of car then there are 4 10 mm blots pull the ears of the seat back from top both sides but one at a time and you will see the 2 bolts there and then 2 more pull up bottom seat at edges both sides one at a time you may have to remove so tape covering these to see them but they are there once that is all done the back of seat will come out make sure the back is clear of seat belts. There are 2 more bolt you get to from under the car to remove bottom seat if needed you cannot see them easy the are inside frame but if you lift bottom seat once the back of the seat is removed to will see the line up in the bolts and that way you will know where to look under the car to find those bolts holding down the down seat.
My '91 Stanza has automatic shoulder restraint but I have to buckle the lap belt.
Take it to the dealer the seat belts have a life time warrantee form Nissan they will fix them for free. Check the warrantee section of you user manual.
The fuel pump relay on a 1991 Nissan Sentra is in the gas tank. To get to it you have to remove the back seat in the car and you will see a compartment that is at the top of the gas tank.
it might be under the passenger's seat covered by some carpet.
Remove the rear seat, there is an access panel right above the tank. You'll be able to access both fuel hoses and sending unit connection.
The pump is located in the fuel tank. There is an access panel under the back seat to get to the fuel tank.
quickly
by your left foot when sitting in the drivers seat
just 2 simple yellow clips under seat pull them and its out
next to the engine on the back seat part
Under the back seat on the right side. Lift the seat bottom.
Its under the passenger seat,undo spring clips at front of seat and flip seat back.