My old 03 Rio was feeling a bit underpowered under acceleration and sometimes it would cut out momentarily. I thought it might be an idea to change the fuel filter. When I took the old one off it was full of water! Looks like I'm going to have to flush the tank out now before I put the new filter on. Never had this problem on a car before, I'm wondering if it's due to the petrol having to contain a certain percentage of bio ethanol these days. Ethanol picks up moisture from the air. Anyone else had these sort of symptoms?