yes, the 90 240sx is EFI. To release gas pressure, twist your gas cap off (you'll hear the pressure hiss). You can put it back in or leave it off it doesn't matter. Then, find your fuel filter. Loosen the upper rubber line and pull it off, some fuel will spill, that can't be prevented. Tuck the line away and do the same to the bottom line. Install is reverse of removal, make sure both lines are connected and tightened, and make sure fuel filter is secure.
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