  A comparison between the CO and HI Tully-Fisher relation for a sample of 30
Virgo ga\-la\-xies shows no significant difference concerning the intrinsic
scatter. The distance moduli from both relations after correcting for the
sample incompleteness bias agree within the errors and also show no significant
difference with previous studies of the Virgo cluster using a complete sample.
The CO total linewidth and the CO flux were found to be not well correlated.
However, if the distances to the individual galaxies were calculated by the CO
Tully-Fisher relation, the CO luminosities calculated using these distances are
correlated with the CO linewidths. This correlation does not show up when the
distances were calculated by the conventional HI Tully-Fisher relation. Finally
we give the structure of the cluster as derived from this small subsample using
the distances to the individual galaxies. The large depth of the cluster is
confirmed both by the HI and the CO Tully-Fisher relation.
