Hello

I am new to this forum. I have a 2015 SE450 with an issue filling the starboard tank. I suspect it is loosing prime as it just sits and runs and runs. I have tried filling under way which occasionally works, I have used an external ballast pump to reprime system or I just end up filling it with this pump. I have pulled the pump to check hose connections they are all good. Does this pump wear out? Is it a vane pump similar to a fuel transfer or oil change pump (dumb question, of course it is) I mean a reversible rubber or plastic pump head? Would it solve problem by lubricating the pump with silicone for O rings or something similar. The boat gets used quite a bit, sometime several times a day, also fairly mechanically qualified.

Thanks