Leaking inlet nut

[tucsonjwt]

I have a leaking inlet nut on my 83 C20 454 Quadrajet. I replaced the white nylon washer but it is still leaking. I think the problem is that the washer does not extend past the end of the inlet nut - I can feel the end of the inlet nut threads when I run my fingernail across the end of the nut with the new washer installed. Where can I get the correct washer and shouldn't it extend past the end of the inlet nut threads?