I replaced two leaking lines. I bought high pressure 1/8" ID hose online (several sites have it). Each line is individually removable. At the pump end, each pair of lines is held in the pump body by a star-head screw. Remove the screw and just pull out the fitting.
End fittings can be re-used by carefully cutting around the crimped area about 1/8" from the end and grinding it flat. It will pull off, exposing the hose underneath. Carefuliy, without damaging the barbs, cut the old hose off. Push the barb into the new hose. If you can find small hose clamps (not the type with a worm screw, but one with a nut & bolt which applies a clamping force evenly over the whole circumference) use these to secure the end. If not, you can use 18 ga. steel wire, wrapped twice around the hose and twisted like a twist tie. Put three or four of these twist wires around the new hose over the barb area.
Careful with the little O rings in the fittings while doing all this. Total cost to replace all lines is about $30 + 3 hours work.
Good luck!
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