Gas expanded and overflowed over night?

67Dart273 said

Not a vent problem, no vent problem could possibly cause that. I think the OP had it right. Maybe you just got "lucky" and got a nozzle that has a poorly operating shut off, and somehow just filled it quite full.

What is the temp difference from the gas station to your garage? Heated garage?

As "tall" as the fillers are on Barracudas and even the other A bodies, that doesn't happen often. I've owned 3 B bodies, a long time ago. The fillers on them are barely above the fuel tank "roof"----out behind the license plate. I used to "wash" my rear plate quite often.

Click to expand...

So I looked into it and apparently gasoline expands 1% with every 15 degrees of temperature. I think it's an 18 gallon tank, so 0.18 gallons or 23.04 fl oz. It was 45 degrees last night and 65 degrees when it overflowed (not unusual in California "winters"). It was 20 degrees not 15 degrees warmer, so roughly a 1.3% increase, which brings it to 29.952 fl oz, which is quite a bit.

The vent has a bit to do with what happened. Someone had removed the vent tube and put just some rubber fuel line in its place. Not even with a hose clamp, just a zip tie around it. So I when the gas vent up towards the gas cap it went past the hose and zip tie, ran down the filler tube and that's were I saw it dripping out.

I will investigate further, but it appears to be a combination of unusual circumstances. I will definitely fix that vent tube situation!