The most elegant, space-saving and simple solution to your water pump problems would be Liquid Tesseracts connected to Aqueous Accumulators.
Place the Accumulator in the centre of a 3x3x1 hole filled with water with the tesseract connected on top of it. You can have one tesseract outputting to all other tesseracts. However to be truly explosion proof you would want one tesseract on each engine feeding them water. This way you avoid the need for pipes and extra things that can go wrong.