Yes there is a seal that can be replaced but there is a 50/50 chance of it working or not.
That much stop leak will plug your pump and burn it out.
Never use more than 1 small bottle of stop leak.

 

I tried to replace the seals in my steering gearbox and bent the pittman arm puller. The arm would not come off even with an air impact. So when I get the funds I will replace the gearbox. I also had the high pressure line from the pump to the gearbox fail a couple of weeks ago and the fluid would squirt out of the seams on the hose. It only squirted out when the wheel was turned making the pressure in the line increase. You can replace all of the hoses from AB for $120.

 

The bottle of Lucas, says that it may take 1 or two bottles. After I put the second bottle in I let it sit for a few days. Yesterday I topped it off with PS fluid, and drove about 10 miles. When I got to my destination I popped the hood, and the reservoir was completely full, no leaks. I can’t say with certainty that it worked, but so far so good.

Thanks for replying.

 

I created a photo tutorial how to re-seal the power steering pump on Rover. I think it might come in handy for you, because this pump is the same as on some Land Rovers.

For tutorial please check the following listing:

Rover Power Steering Pump Gasket + step by step tutorial / Land Rover fits too | eBay

Hope helps.
Sebastian