You might want to check these threads....
http://www.zilvia.net/f/showthread.php?t=63587
http://www.zilvia.net/f/showthread.php?t=54065
If your going thru gasoline like there is no tomorrow then you might want to check your ECU first before you attempt any repairs. Put your ECU into Diagnostic Mode...see
www.240sx.org FAQ page for instructions. Once you put your ECU into Diagnostic Mode, then check to see what type of Diagnostic Trouble Codes your car is kicking out.
Once you pull the Diagnostic Trouble Codes, then pop the hood of your car & try to figure out what may be causing your problem. Areas to check are.
1). Fuel Regulator....sufficient / not enough / too much vacuum going to the Fuel Regulator??
2). Fuel Injectors...is one or more leaking??
3). Engine Cooltant Temperature Sensor - a faulty ECTS or bad wire leading to your ECTS may have your ECU thinking your engine is still cold & causing the extra fuel to be dumped in your intake manifold.
4). Idle & Timing...check your Idle & Timing - make sure they are set properly
5). Oxygen sensor - test it thru the ECU..The Check Engine Light .should flash 5 times or more in a 10 second period when the ECU/O2 Sensors are placed into Diagnostic mode.
Check these items out & let us know what your results are..
Anyhow, hope this helps..
ID