Hi
There is a (short) distance from the inlet to the check valve / (maybe) pressure regulator. You can get a little water there, no check valve is ever perfect. They also break so it could be a bit less perfect than it once was.
If it's totally gone, turning on the water pump with the plug out of the city inlet (you do have a plug for it ... right ? ) will result in water gushing out the inlet.
If you don't have a plug / cover gizmo for the inlet, that's a really good thing to go get. I will keep road grit, bugs, and who knows what else out of there.
Bob
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