Hi, I’m Chris. Welcome and thanks for asking your question!
Is the nut not turning or is it rounding off on the edges?
Thanks for replying.
Options at this point are limited. You can get a flare nut wrench style crows foot that has a little more bite shown below.
If you have access which I doubt you do, you can use a pair of vice grips clamped on very tight to break the fitting loose.
Do not heat the pump nor the fitting, this will cause even more damage. you can however spray some rust penetrating oil around the fitting to help free up the rusted threads. You can use a center punch and hit one of the flat sides of the nut in the direction to loosen it which will sometimes free it up.
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Cutting the pipe and using a socket to remove the fitting and then replacing the line is an option. Getting the other end off the steering gear is normally easier.
Below are 3 images where you can buy a single tool.