Boat ran great on the new Moeller tanks. But.... I see what you're referring to now on the venting of pressure. If the tank sits in the sun and builds up pressure, their new gas cap doesn't vent it out. Here's what I noticed. The vent screw is spring loaded. If you unscrew it, it pops all of the way up blocking the vent. If you push it half way down, the pressure is released. Here's my question, has anyone removed the spring? I'd be willing to bet that would fix it.