Fresh Tank Spillover Valve Upgrade

[bellis]

This was inspired from TucsonJim on the thread: https://gdrvowners.com/forum/operati...flow-revisited

I prefer ball valves and purchased one from Lowe's that is a SharkBite 1/2" valve. The other side did not really matter as it just spills out from there and is not connected to anything.

Remember: Open the valve when filling the fresh tank to allow it to spill out and pressure not to build....then close back when finished to prevent tank spillage into the overflow line.

[Country Campers]

Also remember to open when using from the fresh tank to allow air to fill when the water is used so the tank does not collapse.

Brian

[AZMike]

Also remember to open when using from the fresh tank to allow air to fill when the water is used so the tank does not collapse.

Brian

The gravity fill has a vent hole, does it not?

[TedS]

If the tank is gravity filled with vent, then there is no need for the overflow vent.

[NoPeeking]

I did the same... and from Lowes, for about eight bucks. (Also, valved the low point drains.)


The gravity fill on the 2400BH is vented.



Mike

[Cate&Rob]

I
The gravity fill on the 2400BH is vented.
Mike

Hi Mike,

While there is a vent opening at the gravity fill, it may not be connected to the tank. Please confirm that this is connected to the tank before counting on it to vent the tank if you close the overflow/vent.

Rob

[NoPeeking]

Hi Mike,

While there is a vent opening at the gravity fill, it may not be connected to the tank. Please confirm that this is connected to the tank before counting on it to vent the tank if you close the overflow/vent.

Rob

It is... I can feel/hear air escaping when filling through either the gravity fill, or the city water connection tank fill. When using the city water connection, I open the cap on the gravity fill as well.

Mike

[Dude]

I did this same setup on my Hot and cold Drain lines for winterizing. Way better than the plugs that came with the camper.

[Cate&Rob]

It is... I can feel/hear air escaping when filling through either the gravity fill, or the city water connection tank fill. When using the city water connection, I open the cap on the gravity fill as well.

Mike

I had heard that Grand Design was going to begin connecting the vent adjacent to the fill, where this fill is on an exterior wall. Yours is the first report of this actually being done. This does beg the question of . . . why have and overflow/vent under the trailer if there is a better one adjacent to the fill point?

Rb

[TedS]

IMO, the gravity fill/vent is the best solution to venting the freshwater tank. It allows for maximum filling and water retention. It even works when you use the power fill and it is a passive solution; no valve to remember.

[NoPeeking]

Rob, you had me scratching my head on this one and I do stand corrected... that vent next to the fill port only opens to the inside of the cabinet. (The sound/feel of exiting air must be from the fill line itself (which I assume acts as a vent if you remove the cap when filling at the city connection).) The inside of that small vent pictured above was plugged with caulking on the inside. When I removed the plug, daylight. So, back to being cautious when valving the overflow drain.

Mike

[Cate&Rob]

Hi Mike,

This makes more sense with what others have found . . . the “vent” connection at the gravity fill is not connected to anything. I seem to recall that someone found a vented cap for the gravity fill that allowed it to be a source of air when drawing water from the tank. (I can’t find this reference at the moment .)

Rob

[Yoda]

Rob, you had me scratching my head on this one and I do stand corrected... that vent next to the fill port only opens to the inside of the cabinet. (The sound/feel of exiting air must be from the fill line itself (which I assume acts as a vent if you remove the cap when filling at the city connection).) The inside of that small vent pictured above was plugged with caulking on the inside. When I removed the plug, daylight. So, back to being cautious when valving the overflow drain.

Mike

Mike. If you do a search - in the OLD days my80's vintage wanderer came with a vented cap on the exterior fill as that is all there was - an opening direct to the tank under the bed. Perhaps you can find one of the old style caps. It had a 1/4" hole in it and inside a bug screen. In a tight turn when the tank was full it would spit water.

Keith

[Canyonlight]

Mike. If you do a search - in the OLD days my80's vintage wanderer came with a vented cap on the exterior fill as that is all there was - an opening direct to the tank under the bed. Perhaps you can find one of the old style caps. It had a 1/4" hole in it and inside a bug screen. In a tight turn when the tank was full it would spit water.

Keith

Keith - our 2004 Cougar TT was the same. Seems even our 3 prior mini-homes were the same. We could certain feel the rush of air coming out and then spitting and sputtering until a steady stream of water came out. Right next to the water fill made sense to me but probably more parts/labor install for many of today's builds where even a loose change/a few dollars gets the pencil pusher numbers folks "all shook up !"

Dan

[Yoda]

Keith - our 2004 Cougar TT was the same. Seems even our 3 prior mini-homes were the same. We could certain feel the rush of air coming out and then spitting and sputtering until a steady stream of water came out. Right next to the water fill made sense to me but probably more parts/labor install for many of today's builds where even a loose change/a few dollars gets the pencil pusher numbers folks "all shook up !"

Dan

Dan I did not make myself clear enough. The vent was in the screw cap, not beside. like the hole in the picture of post 11. So for those with exterior fill all they would need to do is change the screw on cap.to the vented style. Sorry if I was confusing, I guess you could make you own by drilling a 1/4" hole in the cap and placing some non rusting fin mesh screen inside with the washer over it to hold it in place.

Keith