My 200sx has been having a persistent fuel odor after parking it. When I get in the car I can smell a fuel odor, as well as around the car in the garage. I tried to trace it down and it seems it is coming from the fuel tank filler area. There's a strong fuel odor there. When I remove the cap it still seems to be holding pressure ok. I looked all around for leaks near the filler but found none. Is it possible it could have a very small pinhole leak causing this? Is there some type of fuel filler test I could get done at a shop?

I think the car is most likely having some injector problems too, gas mileage goes from good to really bad every other tank.

maybe the sending unit o ring? is it worse when you fill up?

its probablly the o ring under the back seat four 10mm bolts hold the plate down