ok ive been getting a pretty bad petrol smell in my car lately so i checked the fuel lines and theyre all cracked, ive done them before but its was 2 years ago, how long are they meant to last cos im pretty sure itd be more than two years, anyway i remember doing it last time was quite difficult because of the angles and from memory the fuel lines go under the throttle body? i think. any tips or tricks for doing this job? oh its for my VR 3.8

cheers michael