Hello, I'm Danny.
It sounds like you might be having an issue with a weak or failing fuel pump. Just because you hear it working doesn't mean it's supplying adequate fuel pressure. I would suggest performing a fuel pressure test first to rule out fuel issues.
Here is a tutorial showing how to perform a fuel pressure test:
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
The fuel pressure specification for your Kia is 49-50 PSI. After performing the fuel pressure test get back to us with the results and we'll go from there. Hope this helps and thanks for using 2CarPros.
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Monday, August 23rd, 2021 AT 3:05 AM