My 2072 has the same problem. I have to use a jumper wire sometimes to get the fuel solenoid to open on the Vanguard. I've been meaning to simplify the harness and fix the problem for quite a while. I will get to it one day.
__________________
Travis
1993 Cub Cadet 2064
1988 Cub Cadet 2072
1980 IH Cub Cadet 782 w/CH20
1966 IH Cub Cadet 102 w/K301
1961 IH Cub Cadet O
1967 IH Cub Cadet 102 & 122
JD 2155 w/ 175 loader