ok , after a month of driving the car keeping it above a quarter tank of petrol. the problem hasnt returned. however there is still a petrol smell in the back seat. i just lifted the back seat and someone has cut a hole in the fucking floor ( im guessing to acces the fuel tank / change the fuel pump ) and just covered the hole with a bit of riveted sheet metal!!!! is this normal?!?!?!?! can i do anything about it now or do i just throw this thing on the scrap heap now ?