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Capran.
I also struggled with pump out problems. Try the vent issues before you get brave and open the top of the holding tank looking for sludge. On my fiberglass tank the lines (pipes) going into the tank were stainless steel and were of different lengths, the longest being the pump out which went close to the bottom. The pipes were eaten up with corrosion and full of holes. Once the fluid level went down to the first hole, any pumping ended. Threw it all away and switched to pvc. Good luck.
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