Greg, the opening right above the fill valve is used with the short hose when you want to fill the tank from a bucket. Since turkey at grandmas will be served soon, we decided to use the following work around: we opened the valve under the sink so that city water could come through the sink faucet. Then we used the short hose that came with our van, and connected it to the manual fill opening on the tank. The other end of that short hose was just held underneath the faucet, and we contrôlée the volume of the faucet to just pour water into the hose. This filled the tank easily for now to three quarters of the way. We will talk to sports Mobile next Monday and figure out the rest of the issue. I will update this post after that. Thanks a bunch to all who responded, and especially great.
Here is a picture of the workaround.
Note: I have a hunch that only those who use Tapatalk are able to see my photo links, since Tappa talk uploaded them to one of their servers and furnished the link. Maybe I can replace these photos with the ones that I have uploaded to the forum gallery once I get back to my mac.