Your local auto parts dealer
sawzaw
get a factory service manual. It's pretty straight forward. you can also find it online at http://www.nicoclub.com/FSM/240sx
in the floor of the trunk or hatch
about 300 miles
All 240sxs are fuel injected therefore there is no carburetor.
The 1996 Nissan 240 fuel pump is located on the front side of the fuel tank. You will need to get beneath the vehicle in order to view the fuel pump.
The fuel pump is located in the fuel tank. There is an access plate under the carpet above the fuel tank.
under the hood passanger side there is a fuse block its in there
There is no fuel kill switch on the 1990 Nissan Maxima. There is a fuel pump relay switch that can cause the fuel to be suppressed.
The fuel filter is located under the hood on the back firewall, passenger side.
The fuel pump on a 1991 Nissan 240 SX is located back by the fuel tank. It is an in-line pump, in the fuel line that runs from the gas tank to the carburetor. It is about the same size as a large soup can.
It is in the fuel tank! Access panel is behind the rear seat and under the carpet. Pros only I am afraid.