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I have had the same problem, but in my case the injectors themselves were leaking. Take a look at yours after shutting off the car hot. On mine one was seeping externally. It wasn't the O-rings on the top or the bottom, it was the body of the injector itself. It was really easy to replace. I just loosened the two 12mm bolts that hold the fuel rail down and pulled the rail up enough to lift the injector right out. Carefully lower it all back into place with the new injector and you're set. No more gas smell coming in through the ventilation system.
I had another one leak later. So I ended up replacing all of them eventually.
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'93 SE-R
'89 B12 4WD GA16DET
'86 B11 Euro-Rallycross car
'81 Datsun 210
'77 Datsun B210
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