I'm going to replace the check valve on my fuel pump. It's an 82 with a 1.7L 8V. I haven't received my bentley yet (stuck at the border), So I don't have a replacement procedure. Anything tricky I should watch out for? Do I need to depresurise the system? I've got a lift so I will have pretty good access, anything else I should take care of while I'm under there? Thanks Vince