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Old 12-02-2020, 04:50 PM   #11
FoxtrotCharlie
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City: Mississippi
Vessel Name: ADAGIO
Vessel Model: CHB Present 42 Sundeck
Join Date: Jul 2014
Posts: 920
I just solved a similar issue. Our boat has main 250g water tank under aft queen bed. Forward 100g tank is under floor of forward cabin. In the two years we have used the boat we have never been able to access the forward tank. PO said they never used it also. Finally dawned on me that with the forward tank being much lower, when the higher aft tank emptied the FW pump would just suck air from that tank. I opened the forward inspection hatch and saw an extremely clear/clean tank full of water(monel steel) - yep, any time there was at least 1/2 full aft tank, it would flow down (1/2' pex lines) to the lower tank. The lines came to a tee, then to the FW pump. I simply installed a valve in the line from the aft tank. When turned off, the pump pulls perfectly from the forward tank. Since that tank had not been used, possibly in the 30 yr life of the boat, I commissioned it with an appropriate amt of bleach. 350 gal should help on our planned Bahamas trip - when covid is over.
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