kcab wrote:The Stanton 10508, or 11508 is the correct cap for this car the info If got from site Stanton . My other point is why would it take 3 months to come on if it were the cap.
All modern cars perform a 'system readiness test' to ensure the integrity of the fuel system. It's federally mandated and is designed to reduce evaporative fuel emissions. Basically it uses a combination of sensors to test for leaks in the gas tank either by applying a pressure or a vacuum. There are some pretty strict conditions on when these tests can be done. In some cases, it can take days/weeks before the conditions are right and the system can perform the test. This is why it takes days/weeks for the light to activate/deactivate.
I have heard of many reports regarding Stanton gas caps. Some work flawlessly, others have nothing but problems. It depends on how well the cap fits and how it's used. Unfortunately there is no fix short of trying another gas cap and the dealer will not provide any help as it's not an OEM Nissan part.