Post by
MinisterofDOOM »
https://forums.nicoclub.com/ministerofdoom-u16506.html
Tue Jan 06, 2009 10:02 pm
EVAP CEL codes are usually caused by a poorly sealing gas cap. It is possible that your fuel fill issue is related, though. Anytime the fuel system sees a loss in pressure retention it'll trigger an EVAP code and the CEL (check engine light). The fuel system is supposed to be a closed system to prevent fuel vapor escape for emissions standards, which is why the code trips. You may have an issue elsewhere in the fuel/EVAP system that's causing one or both problems, or it may just be your gas cap.
EVAP codes will normally reset themselves (and the CEL) after they see the fuel system is sealing properly. Usually with "faulty" EVAP codes triggered by a gas cap not sealing properly, all you need to do is tighten or replace (as in get a new cap, not just re-secure) the cap and drive for a little while and it'll reset.