Originally Posted by Js139
It is super weird to me that the fuel level impacts this...
The ESIM, (Evaporative System Integrity Monitor), conducts tests on the evaporative system as follows: An engine off, non-intrusive test
for small leaks and an engine running, intrusive test
for medium/large leaks.
Conditions for running the intrusive EVAP test are:
After the vehicle is started, the engine coolant temperature must be within 50°F of ambient to indicate a cold start.
The fuel level must be between 12% and 88%.
The engine must be in closed loop.
Manifold vacuum must be greater than a minimum specified value.
Ambient temperature must be between 39°F and 98°F and the elevation level must be below 8500 feet.