I don't know if this has been mentioned before but since I've now run into it on 2 Z's I figured I'd post it. On the first Z I had I chased down everything looking for the cause and didn't find it until well after replacing the tank vent hoses (should have noticed it when I replaced them). This time I knew what to look for when replacing the hoses.

On my 73s on the short hose that goes from the main filler hose to the canister just above it there is a little plastic fitting that the hose goes over and then the fitting goes inside the filler hose. You can see the opening for it when you remove the gas cap. That plastic fitting likes to crack and the crack is just enough of an opening to vent fuel fumes to inside the car. It also seems to like to crack just to the side so it is somewhat hidden.

I probably should have gotten a picture of where it goes in the car but after replacing the interior panel the first time and discovering that I'd forgotten a screw from the vent tank and then replacing it again after that and forgetting to get the front of it pushed under the other panel I decided I'd had it off enough for one evening

Trevor

http://240z.me

Edited April 6, 201212 yr by ta240

Did you find a source to replace the plastic fitting?

Did you find a source to replace the plastic fitting?

I just used a threaded brass plumbing fitting. The threads seemed to grab the hose pretty well and I never had anymore problem.

Thanks for the quick response. Mine broke in half and it is just clamped onto the remaining length; not very secure!