2016 Chevrolet Trax - Hard start rough idle after refill

Hard start and rough idle every fuel up

If this consistently occurs immediately after re-fueling, worse if refueling w/a lot of gas, pretty good chance the evap system purge valve is faulty. That is only supposed to open when driving. If it opens mistakenly during refueling it will allow fuel vapors from tank to move into the engine and cause an overly rich mixture.