I have an ongoing problem with pump-outs only pulling one-half of the tank contents. Pumping out runs fine until about the half-tank point and then stops pulling. I cleared the tank vent line last season, but the problem recurred after two pump-outs. I am planning to clear the vent line again. This time I will rent a small compressor to make sure there will be enough pressure to clear any blockage.
I would like to confirm the vent line is clear before moving the boat to a pump-out station. The tank is a 25 gallon hard-sided plastic unit and is about three-quarters full. Here are some questions before I start the job:
1. Should I disconnect the vent line from the tank before pressurizing the line? Or pressurize the vent line while it's connected at the tank?
2. When I get the boat to the pump-out station, any potential problems if I pressurize the vent line from the exterior while pumping out?
and perhaps most important
3. Are there any other issues that could account for this scenario of pump-out failures? If there is a clog in the system, would the pump-out run ok and then always fail at the halfway point?
Thanks for any wisdom you can share.
I would like to confirm the vent line is clear before moving the boat to a pump-out station. The tank is a 25 gallon hard-sided plastic unit and is about three-quarters full. Here are some questions before I start the job:
1. Should I disconnect the vent line from the tank before pressurizing the line? Or pressurize the vent line while it's connected at the tank?
2. When I get the boat to the pump-out station, any potential problems if I pressurize the vent line from the exterior while pumping out?
and perhaps most important
3. Are there any other issues that could account for this scenario of pump-out failures? If there is a clog in the system, would the pump-out run ok and then always fail at the halfway point?
Thanks for any wisdom you can share.