Are you sure that the fluid is getting past the pump spindle??
I have repaired two LS400's a 92 & 93 in the past where both looked like the seals had gone, in fact it was a 2p 'O' ring that goes on the spigot of the removable fluid container that sits on top of the pump.
On both occasions they had gone hard and flattened off, when replaced no more leaks.
Make sure it is the pump before you buy one they are an arm and a leg, and you won't know if it wasn't because it will obviously come with a new 'O' ring in it.
Hopes this helps you with a cheap fix.
Chris Vince
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Hi chris we have the same problem with our ls400 1993 and was wondering how easy it is to remove the reseviour and replace this O ring.. is the reseviour a push fit into the pump or is it bolted somewhere. any help appreciated.
thanks mal
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Hi Mal,
This is a straightforward job, it involves quite a bit of removal of covers etc to get to the pump and reservoir but once you are there it does NOT require removal of the pump or the disconnection of any pipes etc.
Drain the fluid from the reservoir cup, undo the fixing that holds the cup in place if I remember correctly its a 10mm, then lift the cup away from the pump, use an old mirror if visibilty restricted.
The 'O' ring that needs replacing is quite obvious and fitted onto the cup spigot, try to locate a hydraulic specialist nearby and purchase the replacement 'O' ring from them (you will get a better quality one in the right size).
Reassembly is the reverse.
Best of luck its well worth the effort.
Chris Vince
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thanks chris will have a go at the weekend if it stops snowing by then . will keep you posted to how i get on .
thanks again mal.....