During deceleration, fuel dumping out of the tanks vent line. What gives?

[fullmetaljacket]

Does your fuel tank have two vent lines like some of the OEM tanks (like 1969)? If so, one is short and one is long. My 1969 Roadrunner aftermarket tank had these reversed. The short one should vent through the long tube that routes through the trunk. The long one (that goes to the rear of the tank) vents under the car through a short tube. If these connections are reversed, fuel will dump out the short vent tube on deceleration.

View attachment 1563392

View attachment 1563393

Found the problem fellas. The vent tube was not high enough above the tank and it had dislodged from the fitting, so there was a cavity there where the fuel could leak and spill. Went to the local speed shop and bought a new higher and bigger coil tube and all is dry.
Thank you all for your suggestions as it seems that this problem has many cousin reasons why it could happen. Glad it brought out all the different remedies.
FMJ