I have a water ejector in my basement that takes water from the washer and utility sink. Im getting a funny smell and pretty sure its not sewer gas but something similar. The smell seems to be coming from the tank area. I siliconed the lid but hasn't fixed the problem. the tank is made of fiberglass. the tank seems to have some rust colored residue on the outside in some places. im assuming this is from moisture because the tank isn't air tight anymore. Any advice on what to do next. I tried installing a check valve but found out there was water in the ejector tube at all times. That made me think theres a check valve on the pump itself. My original thought that sewer gas was coming through the ejector pipe into the holding tank and coming through the lid. once I found water in the ejector pipe it didn't make sense that gas could travel from the 6" main line down to the tank. I have pics to better explain. Thanks