lucytravel12 wrote:
We've only owned the camper for a couple of months, but it's 14 years old. Don't know for sure if the gauge is accurate, but it seems to be. I did a "test" last week, tried putting two bucketfuls of hot water down the sink and then measuring what came out. All the hot water didn't come out, and the gauge said it was still half full, so I left the gray water valve partially open while driving. The gauge now says it's empty, so I assume it emptied completely during the drive. How would I know if there's any blockage in the system?
Oh good lord...
You don't have a problem.
Drain lines come out the side of tanks so some liquid is always left when normally draining them.
Tanks also can sag a bit. Nothing abnormal about how your tank(s) are draining.
Waste tank level indicators/monitors are notoriously inaccurate when new let alone 14 yrs old.
And please don't drive down the roadways/highways with dump valve open----even grey water.
No one behind you appreciates that stuff blowing on their vehicles besides dumping grey is illegal in many states.
And grey can be just as nasty as black water.