DUMP & BURN!!!
This mod adds Jettison Nozzle which you can change the nozzle size, dump the fuel and burn the fuel. If heated at least 400K, Nozzle will let out spectacle flames! Dump&BURN!
Be aware that nozzle will pump out the liquid fuel from all tanks including locked ones.
forum thread : http://forum.kerbalspaceprogram.com/index.php?/topic/149203-113dumpburn/