Hoping someone can help, Land Rovers are new territory for me....
I recently acquired a battered P38 that had been sitting for a number of years. The 4.6 V8 is the good bit, aside from a knackered water pump, idler and a few other bits that I've already done.

The EAS was toast and was sitting on the bump stops. Eventually got it running (but not doing anything) using the RSW software and found lots of leaks. All four springs have now been replaced and the compressor rebuilt with new seals. It now works brilliantly apart from the compressor coming on a lot. It will run for maybe 10-15 seconds every 30-60 seconds. I cant see any leaks with soapy water and so far its not sinking when left. So i'm assuming it's storage side. Is the most likely cause leaking seals in the block? Do the tanks ever fail?

Another noise going on when running is what I think is the ABS pump. What could cause that to come on and off all the time?

Also got a fast idle problem but haven’t yet gone through the TPS and ICV so not at a loss on that one just yet.

Any suggestions appreciated..

Should of explained that better, ABS comes on and off alot as it would, but its a hell of a loud buzzing when it does.. Sounds expensive!

ABS pump can be rather noisy. Given the brakes a full massive bleed might help. That's the cheapest option. 5 litres (@ £20ish) should give everything a thorough flush and chase any air out.

ABS pump should come on every 5 or 6 pedal pushes. If it comes on every 2 or 3 then the accumulator might need replacing (hope it is because that's the cheap option at £80). If it isn't any of those yo may need a sit down before you hear what is next.

EAS pump does come on a lot. MIne's always topping up. Storage side generally good but doesn't mean the valve bock isn't leaking somewhere. Get her to full height, pull the delay timer and leave for a couple of days. See if she drops anywhere. After startup the pump will probaby run for 10 seconds but shouldn't take long to top up the tank. You can put a T-piece and a pressure guage on the storage airline if you like. I got obsessive with mine and added one.

Have you downloaded RAVE yet? If not, check the technical section and download it ASAP! It'll have almost everything you need to know.

That's great thanks. Just found the RAVE manual, going to take a while to digest it!!