Is my EAS working correctly or not?

Just wondering if I've got a leak or not, here's my EAS overview. Firstly the good bits:

- Fitted 4 new airbags just a couple of months ago, old ones had perished
- EAS operates perfectly - goes up to offroad height quickly, also drops to access mode quickly, all good
- All other functions work great - lowers at 55mph, etc
- Car stays at roughly the same level overnight

Bits that make me wonder:

- The EAS pump seems to run a lot (I assume it is the compressor I can hear, sound coming from the O/S/R of the car). Does this particularly when stationery, doesn't seem to run as much when driving...or maybe I just don't hear/notice it as much?
- The car drops to the bump stops over the course of about a week or so; it is parked on a gravel drive if that makes any difference to the sensors
- When at work I park on a slope, and it spends most of the morning adjusting itself trying to get level, until the uphill end of the car is virtually on the bump stops and it gives up

Is this all normal operation, or do you think I need to investigate further? I will visually inspect the pipes this weekend, just wondering if I need an EAS service kit Range Rover P38 & Classic EAS Compressor Pump Repair Kit - p38spares.co.uk or perhaps just a new seal kit: Range Rover P38 & Classic EAS Air Suspension Compressor Pump Repair Teflon Seal - p38spares.co.uk

Knowledgeable thoughts appreciated!!

the pumps o/s/f

The Classic Pump is in a metal box under the Drivers door...Tank is on the opposite side under Passanger Door...

What you could be hearing is either the Tank Fuel Pump running (My classic pump could be heard - but only from outside the car not in, but I did like loud music!!)

Also depending on model, year, spec etc. it could have an EVAP system fitted whiched uses a small pump in the fuel system to keep the tank vented.

If you park on a slope, the car will lower itself to its lowest corner, then settle, a few hours later or if a door is opened and closed, it will check for level again.

Rember when we say self level, it is not to keep level with the Earth (like a spirit level) but level with regards to axle to chassis distance.

nathan5346 said:

the pumps o/s/f

Click to expand...

That's a P38, mine is a Classic...

Saint.V8 said:

The Classic Pump is in a metal box under the Drivers door...Tank is on the opposite side under Passanger Door...

What you could be hearing is either the Tank Fuel Pump running (My classic pump could be heard - but only from outside the car not in, but I did like loud music!!)

Also depending on model, year, spec etc. it could have an EVAP system fitted whiched uses a small pump in the fuel system to keep the tank vented.

If you park on a slope, the car will lower itself to its lowest corner, then settle, a few hours later or if a door is opened and closed, it will check for level again.

Rember when we say self level, it is not to keep level with the Earth (like a spirit level) but level with regards to axle to chassis distance.

Click to expand...

Thanks Saint.

I don't think it's the fuel tank pump, firstly because the noise is intermittent - so will run for a minute, off for 30 seconds, back on for a minute and repeat - and second because it still does it when running on LPG rather than petrol.

Also, you can definitely hear it from inside the car, quite loudly to be honest. It sounds like its coming from behind me, but could easily be below the B-pillar.

I thought the 'levelling' business would be normal, just wanted to check. My boss has a P38 and his does it too in some areas of the car park - but weirdly not if he parks in the space I normally do! Very odd.

How often should the compressor run, then?

I would expect the compressor to run on large or frequent height changes.

If in normal operation i.e. not going up and down, and staying at standard (i.e. not going into motorway and back to standard) I would be surpised if the compressor ran more than 3 times in an hour....every 20-30 minutes or so....

Get the car started, and then get on yer knees next to the drivers door and have a listen, the EAS pump is in a metal box with vent louvres in it, have a listen and see if you can hear something.

Some later Classics were fitted with EVAP pumps and these were mounted under the floor behind the EAS pump box (But I think that may have been NAS vehicles..??).

I am not sure how sensitive the EAS pressure switch is to cold weather, but I designed a Liquid Nitrogen Processing facility at Terminal 5, which converts Liquid Nitrogen into Gaseous Nitrogen, and it is stored in a large bank of Buffer cylinders before being dispensed to mobile cylinders.....in the cold, as the buffers are filling they get warm (not to touch but enough to make a difference to internal pressure) and after they have filled and cooled down, the contraction due to the gas cooling, reduces the internal pressure and the system thinks it is low and starts the Cryo-Pump again to top them up, which has the effect of warmng them up.....

This happens 4-5 times before the internal pressure stabilses above the pump cut-in threshold....

Not sure if the EAS system it that temperature sensitive, but you never know....maybe the filling warms up the air which will cool and contract reducing the internal pressure and cause the pump to run again for 30 secs to top it up....pump stops, temp reduces which reduces pressure, pump runs for a few more seconds.....but after 4-5 cycles it should stabilise, unless the EAS system has used some, trying to level the car which means it will start the cycle over again....

I have noticed my P38 pumps runs more when the car first starts up, it keeps cutting in and out every minute or so, for the first 15 minutes of the drive, after that it only runs after a height change, or about 20-25 minutes idle....

Maybe the Wammer or Datatek could shed light on this further....

Saint.V8 said:

I have noticed my P38 pumps runs more when the car first starts up, it keeps cutting in and out every minute or so, for the first 15 minutes of the drive, after that it only runs after a height change, or about 20-25 minutes idle....

Maybe the Wammer or Datatek could shed light on this further....

Click to expand...

I think this is what happens to mine, will pay more attention tomorrow!!