Correction - the CONVERTER changes 120VAC to 12VDC to keep the battery charged. An INVERTER steps 12VDC up to 120 VAC, but are expensive and take a big set of batteries.
As to the pump sucking air, the only input is the line from the fresh water tank, and maybe a winterizing siphon, both located right at the inlet of the pump. Try tightening those fittings (gently, they're plastic!) first.
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Marty and Martha
2015 Z-1 211RD
2012 Nissan Titan
Dalzell SC
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