Water only working when tank is Full?

[DreamCapture2.0]

Hey y'all. I've noticed my water works great until it goes down to 2/3 full from completely full. Does anyone know what this could be???
I replaced the water pump and both check valves on the water heater. I don't See any leaks. I'll fill up the tank and everything works fine. But about a week later it starts sputtering and I know its not going to work after that. I've done this four times, to make sure. Help!

Ahna
www.thedreamcapture2.com
www.facebook.com/thedreamcapture2.0

 

[Kevin D Pem]

Are you sure you have the tank full? Gauges may not be right

 

[Neemer]

Your tank level readings may be off. It sounds like you are simply running out of water.

 

[DreamCapture2.0]

Are you sure you have the tank full? Gauges may not be right

Yes. I'm positive. I can see the tank easily.

 

[DreamCapture2.0]

Your tank level readings may be off. It sounds like you are simply running out of water.

I'm not going by the gauge. I'm going by what my tank looks like.

 

[Kevin D Pem]

I'm not going by the gauge. I'm going by what my tank looks like.

Is the pump above the tank, or along the side?

 

[DreamCapture2.0]

Is the pump above the tank, or along the side?

Pump is in another compartment, below.

 

[Kevin D Pem]

Likely sucking air..drain the tank and replace the tube. Make sure you don't kink it, and use suction side tubing/hose potable rated.
What year is your rig. Not anything to do with how to fix anything. Just went to your site and saw the rig and wondered.

 

[DreamCapture2.0]

Likely sucking air..drain the tank and replace the tube. Make sure you don't kink it, and use suction side tubing/hose potable rated.
What year is your rig. Not anything to do with how to fix anything. Just went to your site and saw the rig and wondered.

Thanks for the info. Which tube? The one coming from the top there on the right? Or down below?
She's A 2003 Winnebago Brave 34D On Ford Chassis w/ V10 Triton

 

[Kevin D Pem]

Don't really see where the one on the left goes. Is there a tank connection behind that tool box?