Fsharp9

Seems I'm getting a gasoline smell coming from the the rear of my 84. Gas cap seal was replaced last year and I can't find anything leaking. Could there be a vent valve malfunctioning and allowing fumes out ? The tank was replaced a few years ago. I'm thinking maybe a evap hose ?

aj986s

If you smell it all the time, the probably some sort of leak. If like a 944, there's probably a access panel on top of the tank, accessible through an opening in the cargo deck, that provides access to the fuel connections and fuel level sending unit.

But, if it happens to occur only after driving for a while, and moreso when the tank is low on fuel, then check for blockage of the vent line. My 944Cup did this a while ago, and finally traced it to a crushed plastic line under the car. When car is running, fuel pump runs all the time, and any fuel not needed by the injectors/fuel rail simply returns to the tank. But the vent line is clogged, the tank builds up pressure, and can eventually overpower the gasket beneath the access panel. And if more air space is in the tank (low fuel) the pressure builds up even higher. I cut out the crushed portion of tubing, and sleeved slightly large tubing over the remaining tubing ends. Since no fluid travels through it, a couple of zip ties to secure, and no more fumes.

bureau13

There is indeed an access panel under the carpet in the hatch. Pull it up and first, see if there's evidence of visible fuel around the large plastic nut that holds the fuel level sender in place. In any case, there's an o-ring or gasket of some sort on the top of the sender, it's cheap and easy to replace, and is a frequent culprit in fuel smell issues from the rear.