NHTSA Complaint #11521552 — 2007 KIA SPECTRA

I purchased my 2007 Spectra5 used with 155,000 miles on it. The engine had no codes or any stored codes. It ran fine until I filled it up with gas. I DO NOT overfill the tank because I understand EVAP issues. After filling up the vehicle would stall at idle and occasionally lose power (momentarily) at highway speeds (55 mph and up). Obviously this is an extremely dangerous situation! Once the gas level got below 1/2 tank the issues went away…but now I ONLY fill the tank to halfway and the problems arise again every so often. Since there are no codes present I cannot replicate the issue without possibly damaging components further and I already replaced the battery, plugs, IAC valve, MAF sensor, and oil to try to remedy this problem. From reading other’s comments about this same problem I do not want to keep pouring money into a problem that KIA itself seems unable, and unwilling, to fix. This is extremely frustrating and dangerous as occasionally the vehicle loses all power on the highway at speeds exceeding 55mph and I feel an accident is inevitable. I’m not financially well off enough to just eat the cost of this vehicle and get a new (used) vehicle though so KIA has really put me (AND OTHER DRIVERS) in a difficult and dangerous position. As others have stated from mechanics who have tried to diagnose this issue, there may be a serious issue with the EVAP system including, but not limited to, the charcoal canister and purge valve. I will try replacing the fuel filter in the gas tank but I do not have high hopes that this will fix this problem. Once again, there are no codes present before or after these stalling/power loss problems and live data from and OBD2 scanner is within parameters for this vehicle and it’s age. I need to report this now so everyone, ESPECIALLY KIA, is aware of this issue and information.