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Either the pump is totally hosed, or it's full of air and needs a good bleeding AND it's not bolted down to the engine very well. No, it's not shock mounted at all. The pump is bolted to a cradle. The cradle is bolted to a plate. The plate is bolted to the head. You can unbolt the plate from the head this way.
The only time I've ever seen a leak from the lid was when the lid wasn't tighened down right. Perhaps it was overtightened in the past and the seal inside the lid has been messed up ?
Also, have you eliminated the possibility that so much fluid has overflowed from the resevoir that it has dripped down the side of the pressure hose (the one with metal fittings) down to the steering box ?
Most likely, the PO messed with the system and didn't reassemble it right, so one or more of the fittings is messed up. Worse, he may have done so while working on the exhaust manifold or the cylinder head on that side. Did he say the car had a valve job ? Or is there any evidence that the manifold has been removed recently ?
With the engine off, take off the resevoir cover. How full is it ?
Start the car. Now, fluid should be circulating well. Is it full of air bubbles ? Have an assistant turn the wheel slowly one way, then the other; chock to chock. The fluid level will rise and fall. will the fluid suddenly froth turning in one direction and not the other ? That would be consistent behavior with the noise if the problem is air in the system (I think).
-CTH
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