I have a 69 Camaro which I recently worked on the sending unit to get my fuel gauge to work. Last night I took the car out for its first run of the spring. After returning and later going back into the garage, it smelled bad of gas. So my question is, is the O ring to seal the sending unit suppose to go on or face a certain diection? I know it has a little tab on it and just figured that was to help with removal of it. Also is everything supposed to be totally sealed up? I'm just wondering if the feed tube of the sender has a small crack around where it enters the top.