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[Lazydocker]

Doesn't make any difference. I've run 2 different pumps with sensor arm at max height (and by applying 12v and both behave the same... Neither raise the body past normal ride height

[05omegav6]

When you apply 12v directly to the pump, is that ignition on or off

Actually, ignore that, if the pump is unplugged from the rest of the system to connect it straight to the battery, then ignition power is irrelevant as the pump will run regardless

[chrisgixer]

With the arm up, the original pump ran constantly. But the car stopped rising at normal ride height. Pump still running, arm not moved(as the pump is still running)

Did I mention, the pump never stops running. But the car stops rising. Why?

Suspension not binding as the suspension drops when jacked, so the shocks can't be stuck. (Missed that post earlier)

It has to be related to air volume reaching the shocks. As the pump never stops running with the arm up. It should top out, but doesn't.

If I understand things correctly...?

[chrisgixer]

Further, the second pump behaves the same way. Never stops running, but the suspension doesn't top out.

Is that correct Ld?

If so, it's not electrical. Or at least we won't know the electrics are fully working until the ecu sees a rear ride height that cuts the pump.

(Dropping the arm won't see the pump vent as there's no back pressure... Or is there?

[Lazydocker]

All correct except there is air pressure... Pop a line off the shocks and plenty of air there (must be anyway as it gets normal ride height)

Not sure about venting to lower as I can't remember, although the sensor arm does happily switch pump on and off

[Kevin Wood]

Sounds to me like it's basically working but the system can't raise enough pressure to lift the car beyond the level it's getting to. Once you get a certain pressure up, either a leak opens up or the pump tops out due to wear, perhaps (granted it would have to affect both pumps you've tried).

Is there any way you could connect an airline / tyre pump with pressure gauge to the system, pump it up and see if it'll raise fully, and then hold that pressure? Then maybe you could watch the pressure generated when the in-car pump is doing the same, and see how it compares?

[05omegav6]

Quickly as it's busy...

Jack it up, pump on. Once shocks fully extended and inflated pump off. Car back on ground and see what happens... Assuming not already tried

[henryd]

Sounds like the pumps have lost there performance,pretty common with air suspension pumps,I see many Discoverys and Range Rover sports with the suspension warning light on because the pump can't make the pressure that the ECU wants to see.

[Lazydocker]

Sounds like the pumps have lost there performance,pretty common with air suspension pumps,I see many Discoverys and Range Rover sports with the suspension warning light on because the pump can't make the pressure that the ECU wants to see.

I'd agree if it wasn't exactly the same with both. 2 different pumps have lost exactly the same amount of performance? Seems too coincidental

[Lazydocker]

Quickly as it's busy...

Jack it up, pump on. Once shocks fully extended and inflated pump off. Car back on ground and see what happens... Assuming not already tried

Tried...

[Lazydocker]

Sounds to me like it's basically working but the system can't raise enough pressure to lift the car beyond the level it's getting to. Once you get a certain pressure up, either a leak opens up or the pump tops out due to wear, perhaps (granted it would have to affect both pumps you've tried).

Is there any way you could connect an airline / tyre pump with pressure gauge to the system, pump it up and see if it'll raise fully, and then hold that pressure? Then maybe you could watch the pressure generated when the in-car pump is doing the same, and see how it compares?

I have tried pumping up with a tyre inflator but no easy way of doing this.

[Lazydocker]

Oh... And no leaks

[chrisgixer]

I might be looking to get an air line nozzel on the connector at the pump end. It's the same spring clip as on the shocks.

Then seal it, somehow, clamp the line? and see if it holds height.

[albitz]

Got another pump here if you want to try it. 

[Lazydocker]

Got another pump here if you want to try it. 

Not really... Sick and tired of taking bumper off and on

Probably... Sorry, got your pm