Yes, you are supposed to have a vented cap. But, a non-vented cap causes the fuel pump to created a vacuum in the tank, not positive pressure. If you have a "original" cap turn it upside down and look at the edges, they should be corrugated which is where the cap vents. ________________________________ From: Sharon Chamberlain <sharonvws@xxxxxxxxx> To: tcb@xxxxxxxxxxxxx Sent: Monday, November 4, 2013 9:26 AM Subject: [tcb] gas gushing out near cap I need some advice on our 67 westy- gas pressure builds up and it runs out from near the gas cap-we were planning on leaving tomorrow morn for Florida shows . Anyone got an idea why and how to fix it. Steve thinks all we need to do is buy a vented cap, we have an original one on there now. Don't want to be a fireball. HELP