[vettestr]

Hey olddog,
If you can post a photo of fuel cap it will save a bunch of ??
If you have the standard flip top fuel cap then does it have an internal cap inside that, is it a sealed or a vented cap? Is the vent hose run outside the body where fumes will not fill the trunk or cockpit? Does it have a fuel filter on the end of vent to keep crap out (this is not for fumes)?
If no leaks in fuel cell or hoses it leads to vent hose and vented fuel cap. You can get a rubber plug that expands when you turn a wing nut from local hardware store like Ace. Place this plug in the filler hose end for time of checks only and extend vent hose away from car 6 to 8 feet just for checks. You can not plug fill hose completely and the vent hose completely for long (days) as temp changes will pressurize the cell and that is not good as it will leak fumes for sure.