It'a item #37 of the drawing RacerXX posted.  You can see one at both ends of the steering cable inner wire that slides in and out as the handlebar is rotated.
I've seen many times the buckle at the jet pump, which connects the inner wire to the steering nozzle has been misadjusted accidentally by someone while working on the jet pump.  This is quite common, also a broken plastic outer sheath fastening nut is fairly common.
The steering cable is item #41, it consists of an stationary outer sheath and an inner wire.  The outer sheath is anchored at both ends and does not move as the handlebar is rotated.  The inner wire is connected to the handle bar lever at the helm and the pump steering nozzle by a turnbuckle to allow a pivoting action with no binding forces.
So you need to confirm there are no broken or lose/corroded components or brackets at both ends of the steering cable, loss of steering control can result in a hazardous situation.
If the turnbuckle at the pump steering nozzle is fully threaded onto the inner wire of the cable as it should be, you may make adjustments to the cable sheath at the helm as RacerXX suggested.
Be sure to confirm both ends of the outer sheath are fastened so the sheath doesn't slide or move while steering, this is undesirable as well, and can result in steering control as you describe.
Any broken, worn or missing parts must be diagnosed, be thorough.