The ‘easiest to stretch’ tissue will always stretch before the harder to stretch tissue, so it’s possible that pumping could actually make it worse, as the scar tissue will be the toughest to stretch.
You would probably be better just massaging the scar tissue (‘pick it up’ and roll it between your fingers if it’s the sort that you can do that with) to try to break it down a little and reduce the cross-linkages within it, then gently stretch directly along the scar tissue, avoiding stretching the tissue you don’t want to lengthen.
You will probably find that heat applied to the scar tissue before stretching it will help to increase the elasticity of the collagen within in too. There is lots of detail on proper warm-ups on this site.
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All injuries happen from "too much", or "too much, too soon" or "doing the exercise incorrectly".
Heat makes the difference between gaining quickly or slowly for some guys, or between gaining slowly instead of not at all for others. The ideal penis size is 7.6" BPEL x 5.6" Mid Girth. Basics.... firegoat roll How to use the Search button for best results