Another Fresh Water Tank Leak ( overflow )

fwunder

2023 400 BD. Without dropping coroplast on bottom, this has me stumped. Filling empty FW tank from home hose everything is normal until it reaches full ( indicator light and I used a flowmeter to measure 23 gallons or so ). Then I start to hear water dripping, then flowing on to coroplast and it finds its way out where it can. I immediately stop filling and run pump water until no more dripping sound. Vent is not clogged and no water pooling around vent or pump pickup. Pulled cabinet to check for pooling and disconnected vent line to confirm it's open. Where else can it be coming from?? Of course, once a bit of water is drained from tank, there is no issue. Picture to show inspection. Thanks for any ideas!!

fwunder

Call me crazy!!! ( My wife does all the time )  I just go out to take a pic of all the water pouring out of coroplast and, of course, it’s venting just like it should!! Still doesn’t explain where the water was leaking from, but if it ain’t broke…..

EasternJL

I have a 320 and had an issue with some water coming out from underneath.  Turns out that the compartment where the hose connects to nautilus wasn't caulked in the corners (the ones you can't see).  So, if you are facing that compartment-- the left/right corners closest to you.  So, if any water gets in there it should drain out the bottom hose inlet (shown in your picture), but with the missing caulk, water just went out those holes and came out elsewhere.  I was on an up-hill slope (when filling), so mine came out towards the back of the camper.  Yours looks like more of a steady stream and may be something else, but I thought I'd mention it just in case.  And I'll add, if you have a tight hose connection and no water leaking into that compartment, this clearly doesn't apply to you.