My vent tube has 2 cracks in it and the filler neck has a small crack in it, why will that tank not fill up with gas? I tried to fill up the other day and it wouldnt fill up at a pump so when i got to the firehouse i grabbed a gas can and it wont even fill that way, WHY? Also what kind of rubber hose can i use to replace the filler neck and vent tube, i want to take the metal section out since it is rusted and it cost alot to replace. HELP me cause I need to get everything in working order since its on the road and I need to be able to drive it and know i wont run out of gas. Also my fuel gauge keeps reading over 3/4 tank and when i turn the ignition off it stays where it is and does not go to empty, once again why and what can i do to fix the problem.