For some reason i left the key on acc until the battery on my v6 vp drained down to absolutely nothing. i replaced the battery and now cannot get it to start. it will crank all day but just won't kick over. this is what i have checked: fuel pump relay- ok fuel pump fuse- ok spark- ok fuel pump- whirring happily fuel- yes the car is on dual fuel. i have not run it on gas during the month i have owned it. i have been trying to start it on petrol but it won't start on gas either. the security option in the left hand door jamb is 'off'. this hasn't changed. as stated, it ran perfectly before the battery died. that's the only thing i have changed. any advice will be much appreciated.