car was parked up for 3 months, brought a new battery put it on drove about 1 mile and a warning light came on looked in manual and it said drain sediment out of fuel filter did that light still on so decided to go and buy a new filter, put that on and light still on drove car for about a hour fine light still didnt go out parked it up over night came out and wont start now and light still on. any ideas please.