  In an earlier publication, we introduced the software package, {\tt
\texttt{ePump}} (error PDF Updating Method Package), that can be used to update
or optimize a set of parton distribution functions (PDFs), including the
best-fit PDF set and Hessian eigenvector pairs of PDF sets (i.e., error PDFs),
and to update any other set of observables, in the Hessian approach. Here, we
validate the {\tt \texttt{ePump}} program with a detailed comparison against a
full global analysis, and we demonstrate the potential of {\tt \texttt{ePump}}
by presenting selected phenomenological applications relevant to the Large
Hadron Collider. For example, we use the package to estimate the impact of the
recent LHC data of the measurements of $W$, $Z$ boson and top quark pair
differential distributions on the CT14HERA2 PDFs.
