Bad hesitation/power loss/gas mileage poor

[justmazduh]

Hi guys. Just wondering if anyone had thesame issue .im at 111km So i own a 2011 mazda 3 2.0 Been having problems accelerating at 60-80kmh feels like a BAD hesitation/ power loss/ gas mileage whenever my gas is half way full or Gets worse when my gas is almost empty. Its been happening for a while now when I hit 100k then i tried replacing sparkplugs at 108km . Drive belts and battery were replaced as well but after that for a 1 month of driving the problem was gone but its happening again . So I tried using a fuel system cleaner every gas fill ups cuz i thought it couldve been a carbon build up thats blocking it but turned out a waste. ive used about 40oz already but seems the problem isnt getting fixed.couldd it be a fuel pump issues?Any thoughts? Let me know 😊😊 thanks

[jeff7670]

Fuel pump no because it is either a works or doesn't situation. I'm thinking it is a MAF issue. Are you not getting a CEL?

[justmazduh]

Fuel pump no because it is either a works or doesn't situation. I'm thinking it is a MAF issue. Are you not getting a CEL?

No i dont. when battery was replaced 2months ago ive had cel on for few hours but that was it.

[morganc]

You could have water in your tank as well. But yeah, as mentioned below, you should have CEL's accompanying this.

[Default User]

I'm thinking vacuum leak.