[C320-list] Head backing up

[David Veeneman]

I have recently noticed a Robles with the Jabsco head on Adelante. After I pump the bowl dry, the system backs up a bit, and fifteen minutes or so later, the bowl is about 2/3 full of liquid waste.

This happens when I am using the holding tank. I pump the bowl dry, lock the handle, and leave the pump lever in the ‘pump dry’ position. Until recently, when I pumped the bowl dry, it stayed dry.

Any thoughts as to what might be going on? Thanks.

—
David Veeneman
SV Adelante, Hull#131
Dana Point, CA