The "check gas cap" comes on when the system senses that the fuel tank is not holding pressure. If the new cap doesn't fix it, then there may be a leak elsewhere, most likely in one of the tubes leading into the tank or the gasket around the pump or sensing unit's entry into the tank. (see below)
2000 XJ8 Anthracite/Charcoal
Last edited by QuadManiac; 04-20-2010 at 05:40 PM.