Can You Put a 67 Non Vented Tank in a 72

[PbFut]

I'll add that while working in the area of the fill cap on warm afternoon and fairly full tank there is a faint hint of fuel. I am within 18 to 24 inches from the cap. I beleive it is as Mr 48 chevy says. Full tank will have little air to compress and expansion will push some air out the vent. Less full tank the air will have more air to compress and pressure not rise above vent cap spring pressure. Closest gas station is about 6 miles from me so I have at least a 1/2 gallon of air in tank.