Jimm 10/28/2013Usually, this issue is related to plugged evaporative fuel tank vent hoses - these run from the top of the fuel tank to just next to the fuel filler neck by the gas cap.
As a firststep - simply try to unplug the hoses using a length of hanger wire. If this does not clear up the issue, you will have to replace the vent hoses.
Jimm 10/29/2013The problem may not be related to either inexpensive, poor quality fuel, or the fuel pump installation. The issue - as you have described - is more than likely related to plugged vent / evaporative hose - along the length of tube from the fuel fill tube down to the fuel tank.
Try the suggested repair using a length of wire to unplug the vent hose / tube as first step. Check the 'How-To-Guides' feature on the AutoMD website for more specific steps and instruction, even videos - as needed.