As the title says, the fuel guage is showing empty. I am a pretty smart mechanic but don't know anything about honda's. Are there any good places I can find some tech manuals on how to troubleshoot the system? It may be the sending unit on the tank, maybe the guage, but I'm not sure and would like to troubleshoot the system and wiring before I start replacing parts. It's a 2001 Civic EX.