I have a 2013 Xpress H20B bay boat and I am having issues while re-fueling. The fuel line seems restricted since I cannot press the pump handle more than 1/4 of the way before it bottoms out. I removed the fuel fill line and the check valve is working properly. There are no blockages in the main fill line. I even tried adding fuel directly to the tank with the same problem. Could this be due to a venting issue from one of the lines coming in/out of the tank?