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[YZ250]

..................
So where... This pump works and lifts the car, just not to the extreme. But, thinking about it, does the Estate go really high like the saloon?

I've been out and measured mine now. As previously posted I have just fitted new rear springs and my GM self levelling shocks have done less than 4K. I've taken the car for a run to let it settle and then measured from the ground to the wheel arch, with the tape measure lined up with the wheel centre as vertical as I could get it. Floor to wheel arch with engine running measures 692mm. I then reached under and popped the lower joint off and pushed the lever right up to its stop. With the pump singing its little head off, it had risen to 715mm after about 15 seconds but seemed reluctant to go any higher. 
Bearing in mind that I tow a fairly hefty caravan and have never had any outfit level issues, I did a rough calculation. As I tend to throw everything in the boot of my car when towing, I know that the tow ball dips by less than 1" when fully loaded and sat in the drive, but then comes back up again with the engine running. This is from parked height to engine running height. You stick another 25mm in height at the wheel arch and the tow ball would rise about 2" from parked height. I assume it's then done its job. This being with the arm pushed right up of course.
Tending to agree with your highlighted bit above, as I've never had any levelling issues, even when fully loaded with bricks, but mine did not seem happy to rise above 715mm at the wheel arch. 
It certainly would not have risen to any ridiculous height. 

HTH

Errrr, just to add to this, I've just come back from a ride out and the rear arch measurement is 735mm now with the arm connected. Hope it comes back down to normal height, it looks ridiculous now.  Should I send it lower this time to get it back to normal height? 
Have to re-visit the guide to see if I can get it sorted. 

[chrisgixer]

.... ignition on engine off. Drop the sensor arm to its lowest point. If you then stand by the drivers front wing there should be an audible release of air.

Might be a dicky sensor. Was it on level ground when measured? Level side to side I mean.

[YZ250]

.... ignition on engine off. Drop the sensor arm to its lowest point. If you then stand by the drivers front wing there should be an audible release of air.

Might be a dicky sensor. Was it on level ground when measured? Level side to side I mean.

Cheers Chris, 
It's always been ok so I'll try that in the morning.  In fairness, after the test I just put the arm back on and left it.
Yep, car was dead level side to side when I took the measurements. 

At least we know it goes a bit higher. 

[chrisgixer]

.... ignition on engine off. Drop the sensor arm to its lowest point. If you then stand by the drivers front wing there should be an audible release of air.

Might be a dicky sensor. Was it on level ground when measured? Level side to side I mean.

Cheers Chris, 
It's always been ok so I'll try that in the morning.  In fairness, after the test I just put the arm back on and left it.
Yep, car was dead level side to side when I took the measurements. 

At least we know it goes a bit higher. 

Indeed we do. Now where's that Lazytinker?

(Apologies if those instructions where a bit direct or obvious btw )

[YZ250]

.... ignition on engine off. Drop the sensor arm to its lowest point. If you then stand by the drivers front wing there should be an audible release of air.

Might be a dicky sensor. Was it on level ground when measured? Level side to side I mean.

Cheers Chris, 
It's always been ok so I'll try that in the morning.  In fairness, after the test I just put the arm back on and left it.
Yep, car was dead level side to side when I took the measurements. 

At least we know it goes a bit higher. 

Indeed we do. Now where's that Lazytinker?

(Apologies if those instructions where a bit direct or obvious btw )

Not at all, I was just glad that you replied so I can get it back to normal height.  I had to pop the arm off when I lowered the diff anyway so I'll do what you suggested in the morning. Too cold and dark now. 

[Lazydocker]

Sounds to me like it may be working properly then. Must admit, it would make sense if it didn't rise as much as the shocks are at a completely different angle

ISTR comments on another Estate not rising much at one of the meets too now, although I could be fooling myself

Thanks for that