Vacuum leak?
Jumping the pressure hose to the return hose will give you manual steering. It will operate just like it never had power steering, i.e., won’t be any more difficult to steer than a non-power steering model. Jumping the hoses at the pump keeps the pump from running dry and seizing, causing all accessories to fail.
For the sticklers for details, yes, the manual steering systems usually have more turns lock to lock and would be nominally easier to steer when stopped than the cobbled up mess I proposed but it ain’t noticeable. It has been done on all makes and models with all types of steering.