fuel cell questions

what are you guys using for fuel cells when relocating your tank?? Any particular depth?? how did you go about extending your lines?? All help will be appricated

I reused the factory pump and sending unit in mine.I had a custom built fuel cell made that was the same depth as the factory tank and cut the top and installed the factory stuff.As far as the fuel lines I made some hard lines with flared fittings.