Power steering

Good evening

The most likely cause is the pump itself. There is a pressure valve inside the pump that regulates the pressure.

https://www.2carpros.com/articles/how-to-replace-a-power-steering-pump

Since it sat for a while, the fluid may be suspect. I would have the steering system flushed with at least 1 gallon for fluid to get all the old fluid and debris out of the system.

https://www.2carpros.com/articles/power-steering-fluid-flush

Then see what happens before replacing the pump. This may take care of the issue.

Roy

Your welcome

Always glad to help

Roy

About the only thing that would cause it to burst would be a bad steering pump relief valve or a partly plugged steering control valve on the rack. The pump normally produces a set amount of pressure and lets any extra bleed off through the relief valve. If it stuck the pressure would just keep rising until something gives. In your case it's the hose. When your moving even small motions of the steering wheel will let the pressure bleed through the steering valve. Usually you will hear the pump working against the valve if it is sticking.
Not hard to check the valve as it is a removable part located on the pump. Looking at the picture you remove the pressure line from item 5, then unscrew it from the pump and remove the other parts. Check for crud or anything that could cause an issue. Clean it all up and reinstall in reverse order.

For the rack it is a bit harder. You would need to monitor the steering pressure to see if it is spiking when the rack isn't moving. There is a special tool that connects inline with the pressure output to do that it is, Kent Moore J-44721. You might find one (or it's equivalent) as a loaner tool. To use it you drain the system of fluid. Disconnect the pressure line and install the tool. Open the valve on the tool all the way. Start the engine, rotate the wheel back and forth a couple times then put it tight to one side stop to purge any air.
Return it to center and look at the pressure reading. It should be right around 200 psi/1379 kPa. If it is higher then you have a restriction in the rack side of the system shut it off and see if you can find the problem, like something in the pressure line inlet or the rack itself.

If it is at the 200 psi point record the flow amount from the tester. Now slowly close the valve until the tester reads 700 psi/4827 kPa. Record the pressure and flow numbers. Do not leave the valve closed for more than 5 seconds as you could damage the pump.
Now subtract the 700 psi flow reading from the 700 psi reading. If the flow decreased by more than 1 gal. Per min, Replace the steering pump.