  Long range correlations multiplicity-multiplicity, $p_T^2$-multiplicity and
$p^2 - p^2_T$ are studied in the percolating colour string picture under
different assumptions of the dynamics of string interaction. It is found that
the strength of these correlations is rather insensitive to these assumptions
nor to the geometry of formed fused string clusters. Both
multiplicity-multiplicity and $p_T^2$-multiplicity correlations are found to
scale and depend only on the string density.
  The $p_T^2$-multiplicity correlations, which are absent in the independent
string picture, are found to be of the order of 10% for central heavy ion
collisions and can serve as a clear signature of string fusion. In contrast the
$p^2_T - p^2_T$ correlations turned out to be inversely proportional to the
number of strings and so very small for relaistic collisions.
