I haven't had any issues on my Cat 3126E. Sometimes the pumps will say between 10-20 percent so not sure how much at times. I do have my coach serviced on schedule.
Command Master Chief (AW) USN, (ret)
2003 Fleetwood Excursion 330 Turbo Cat 39D
2000 Jeep GC
2005 Big Ruckus (Rides Behind Jeep)
2003 VTX 1800