Ok so I started my car yesterday and the check engine light popped on code says low fuel pressure figured the pump maybe fixed that codes still there car runs a little run sometimes as if it's stalling but then pressure increases looking to switch the regulator but can't find it can any help anyone know the location for it?

 

I have read that it is in the gas tank along with the pump and filter
Don't know for certain

 

That year model of Sonata has an engine recall. You should call your nearest Hyundai dealer and ask if it's been performed on your car yet. Be sure to have the VIN handy so they can look it up in the warranty system. If so, bring it in and they will perform an engine inspection for free. If it fails that inspection, you could get a brand new engine for free! As far as the low fuel pressure...can you post the exact code (like P01234 or whatever)?