Too much pressure in the gas line...spitting?

Just replaced the fuel filler tube gaskets and seal on the Demon. The next day I started the car, stock 340 with Holley single feed 650 Spreadbore, stock fuel pump, backed out of garage and then back in, only to find three pools of fuel on the drive, about 5" dia. I discovered the fuel line going into the stock fuel filter was leaking, when i pulled the fuel line out of the rubber hose, the pressure was spitting fuel. Could the non-venting OEM 71 gas cap cause pressure buildup? thanks