Hey Paul, the line between the tank and the pump is about 8 inches and I can see all of it and it is definitely not the Source of the leak. As for locating the leak, the water drips down through a crack between the fresh water tank and a "storage tunnel" (it runs the width of the RV and is not leaking into the storage area, merely around it).
The tank is about 40 gallons and my two ways of seeing it is by looking through a small 1x1' door in the back that reveals the water pump and all the connections to the tank, and then from above after unscrewing the board that mattress rests on. The leak appears to be coming from the back side (adjacent to the storage tunnel) which I cannot see, I only know that it starts leaking once it reaches a height of about 2-3 inches when filling the fresh tank, and appears to emanate from the left side of the tank. I've tried removing the tank so that I can investigate further but there is a bracket pinning it against the storage tunnel, and I can't seem to get enough leverage to remove the screws from the bracket in the tiny space that I have to work with.
When the pump is on and water is running the tank gets a little wet at the bottom, but mostly just falls through the crack between the tank and the storage tunnel. The same thing happens when the pump is off. I had my girlfriend try all the water sources while I was looking under the RV and none of them caused an increase or decrease in apparent leakage.
The screws to the bracket to remove the tank are slightly stripped and hard to access. Do you think spraying WD-40 on them would make it easier for me to possibly unscrew them? At this point I'm hesitant to move forward as I don't want to bite off more than I can chew, but everything else is disconnected from tank so if I could remove that bracket I think I could get the tank out, and once it's out I'm very confident I can temp fix it.
