There are 6 fuel injectors, one per cylinder. They are located on the top of the engine.
has 6 injectors
6
http://www.ehow.com/how_7744525_change-injectors-1994-nissan-maxima.html
Fuel injectors
The original fuel injectors on that model were recalled - did you ever have them replaced?
in the fuel tank
I heard that racing fuel will clean out your injectors and converter.
You either have bad fuel injectors or your fuel pressure regulator has gone bad
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Fuel Tank capacity of 1996 1997 1998 Maxima is 18.5 Gallons. See the Edmunds and other automotive web pages to get the specifications.
6