RE: Issue with Fuel Tank
make sure the stopper is sandwiched between two pieces of plastic or metal.....whatever your tank came with....and make sure the stopper, or bung, as it is called is for the tank you have....if it is all good...the screw need to be tightened more......then a good leak check under some water....seal all the lines with your finger or a stopper and blow through an open line....you don't want to see bubbles.......