A volatile organic compounds (“VOC”) collection system has an inlet, a positive displacement pump (“PDP”), a first automated control valve, a pressure vessel (“PV”), and PV top and bottom portion outlets. The PV has PV top and bottom portions. The inlet receives a VOC emission and is in fluid communication with the PDP through an inlet-PDP connector. The PDP is in fluid communication with the PV through a PDP-PV connector. The first automated control valve is in fluid communication with the PDP-PV connector. The PV top and bottom portions are in fluid communication with the PV top and bottom portion outlets respectively. The inlet-PDP connector is under a pressure that keeps the VOC emission in a vapor phase. The PDP-PV connector and the PV are under a pressure that condenses the VOC emission and separates the VOC emission into a gas phase and a liquid phase.