Car not starting with less than half a tank

[Ronin]

So after replacing the fuel pump the car starts misfiring and slowly dies... This happened today while en route to a house viewing..

Last month the car wouldn't start as well with less than half a tank so I thought it was the fuel pump so I replaced it along with 2 o rings, 1 large and 1 small...

Any ideas what this could be before I set this car on fire?

I really don't have any more patience or willingness to pour money and time into it...