The control valve may be sticking. If you can take the front of the pump off (on my car it's six 13 mm bolts), you should be able to access the control valve without taking the whole pump off. It only takes about 30 minutes to do. Get a small ice pick and push in a few times on the very center of the control valve. I am told that they sometimes stick.

The valve is under spring pressure. Just expect the small circular retainer clip to come loose while you're pushing in on the center (it probably will). I am pointing to the retainer clip with the tip of my screwdriver in the picture below. Take note of how it is installed. You may be able to hold the retainer clip flush with the back side of the pump while you push in on the control valve, just in case it decides to come loose.

If there was something that got into the pump while you were resealing it, you may find it at the banjo bolt on the high pressure line--right before it goes into the steering gear box. By the way, if there is something blocking the system, you will not get oil flow and will likely melt the new seals you just installed (ask me how I know).

Also, you need to bleed the system by turning the wheels from lock-to-lock about ten times without the pump running (front end jacked up). I would start there first if you haven't bled it yet. When you finally do start the engine, I think the manual specifies that you only run it for a second or two and then refill the reservoir. Make sure the pump doesn't run dry.

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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles