Top loader Whirlpool. I've removed the back and water is leaking from the Break Vac during fill. The hose running to it is OK. The water is leaking from the back opening of the Break Vac. I'm thinking it's one of three things but don't really understand how this works. 1. Could it be too high a water pressure? would simply partially shutting the house inlet valves solve the problem? 2. Does the Water inlet valve in the machine control the flow and is it bad and allowing too much water to flow through it to the Break vac? 3. Possibly the Break Vac was jostled and in wrong position? The Break Vac appears to be a simple part and there doesn't seem to be anything wrong with it like cracks but maybe I'm missing something.
The "Break Vac" is a vacuum breaker component. You'll find similar devices on sprinkler systems to avoid siphoning water back in should the water supply lose pressure, or on frost free spigots to allow water to drain out of the fixture so it can't freeze and break things. On your washing machine, the design is quite different, simply a plastic funnel sending water into the tub, but the goal is the same, to ensure water can't be siphoned back if there's a loss of water pressure. As for why yours is leaking, you'll need to do some tests to work that out.
If it's high water pressure, you can try partially closing the valves to the washing machine as a quick test, or get a cheap pressure testing gauge to see the water pressure in your home. If it's too high, you may need to have a pressure reducing valve installed where the main enters the home, and possibly an expansion tank to deal with pressure fluctuations from the water heater.
If it's in the wrong position, it should be relatively obvious when you've opened things up. On versions I've been able to find, it clips into place. If the clips are broken, then it's time to replace it. You could perhaps have a problem if the washing machine was significantly out of level.
Two other possibilities that come to mind. You could have a bad clamp holding the hose on to the back of the vacuum breaker, allowing water to leak around that connection. If so, just get a new clamp and replace it. Or there could be too much dirt and debris inside the vacuum breaker throwing off the intended water flow. You can try cleaning it to see if that corrects the issue. If all else fails, I'd just replace the part. It's relatively inexpensive and you appear to be familiar enough with disassembling your machine.
Could it be too high a water pressure?
Would simply partially shutting the house inlet valves solve the problem?
Possibly turn the Washer Water Valve towards the off position - half on half off ..and find out.
- Does the Water inlet valve in the machine control the flow and is it bad and allowing too much water to flow through it to the Break vac?
No. This is a simple open or close valve. On/Off.
- Possibly the Break Vac was jostled and in wrong position?
This would be obvious.
You might not see cracks but remember this component is probably plastic - remove it and test it - see if it leaks where it is sealed together. Are you positive the water is leaking form this thing - it is a SIMPLE device - take a picture if that is not good enough- even a video and post the video on youtube with a link here.
I am thinking your filler hose is cracked and worn out.. but maybe this simple device has a crack at the seal.