Keep in mind that it may not have to pump up if it didn't lower like it was suppose to the night before.
Do you ever get a check suspension message?....like maybe at 60+? Mark VIII's are notorious for venting problems due to moisture in the system.
You can check to see if you have a venting issue by putting some extra weight in the trunk, turn the key on and let it pump up to normal height. Then, remove the weight, turn off the key and close the door.
The rear should vent down quickly and you should be able to easily see it lower. The more weight was added, the longer it should take to lower, but even adding 200 lbs., it should be able to vent easily within 20 seconds or so(the module will only try for a max. of 45 seconds).
If after you shut the door, (clicking coming from the solenoids opening up) you really can't tell thats its venting, you probably have a venting problem, which is a common problem on these cars, but fairly easy to fix.