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Any leaks in the fuel system that can leak out vapors will cause this code.It is unable to hold vacuum in the evap system.The seal around the fuel pump,any vapor lines cracking or a corroded fuel filler neck.The filler neck being corroded through is the most common problem we have seen lately.We use a smoke machine to pump smoke into the evap system to find pin hole leaks.You may need to have a shop with a smoke machine test it for you if you don't see any obvious faults.