Improper intake design:

Insufficient slope between the fill and the tank because the fill line is too long, too short, or too small.

Improper venting:

To make room for the water, you need to vent the tank as air enters. Due to the vent lines being narrower than the fill lines, you can’t release a lot of water at once. The RV owner has the option of spilling water or turning the faucet down to a volume the RV tank can handle if the amount of water entering the tank exceeds the amount of air leaving it.

FIXING A SLOW FILLING RV FRESH WATER TANK

CHECK FOR KINKS

• You’ll find a vent hose next to your RV’s fill assembly, usually on the side. Make sure it’s not kinked or obstructed. Insects can get sucked into unscreened vents.
• If you have kinks in the fill hose, make sure you fix them.
• Filling the tank is easy if the fill hose slopes evenly. Improve it if you can.
• We need a bigger venting system.
• Make sure the tank is filled under pressure.

FILL WATER TANKS WITH WATER FILLERS

Make sure your RV’s portable water tank is full in case you need a bathroom break on the way to the RV park, or if you’re planning on dry camping for just one night