Recently, I had a problem with my 1999 S70. While fueling my car, the gas kicked back as if the tank were full, despite it being nearly empty. As a result, it took about twenty minutes to put fifteen gallons into the tank. Has anybody experienced this before? Could it be a problem with the air vent in the tank? Thank you so much.

 

Yes it most likely is but not sure where.
We have the same problem at times with customers cars but they never want to spend the money to figure it out.

 

Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 Style Definitions table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:"; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin-top:0in; mso-para-margin-right:0in; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0in; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin;} There is a “filter� known as a spider trap within the fuel spout. This is most likely blocked. It happened to me last month. I took it to the dealer and they used compressed air to blow out the spout, which in turn solved the problem.

 

we removed the flapper valve and were able to shoot compressed air through both ends of the valve. There does not seem to be any obstruction. We replaced it and still have the same problem. Is it possible there is an obstruction somewhere else between that valve and the tank?

 

Did you try shooting the air into the tank through the filler neck and see if it vents out the side.