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I might guess there are two different problems.
The stool filling is at the stool as the valve which opens/closes is not fully closing. It can be just a simple jamming and working it a few times may clear it or it may need a bit of adjustment to close sooner.
It should fail when on city water much the same.
But the pump not giving more water sounds like there is an open point which keeps it from building up pressure to move the water better. One of the common items to do this is failing to turn the valve from the fill position back to normal on lots of RV.
A second common thing is a check valve just inside the connection where you attach the hose to use city water. If you look in the connection before putting a hose on, there should be a small plastic disk on a spring pressed up flat against the back of the fitting to seal air from coming out. This disk is pretty small and can get flipped up on a side to not close, so you might look there and if it looks crooked, probing it with some small tool like a small screwdriver may let it slip back into place.
Idea is that water going in opens it but air or water coming out makes it close!
Or is it possible not all drains got closed fully after draining for winter?
The pump should build pressure to a set level and then shut off until you open a faucet but if there is a big air leak it just keeps pumping as it can't build the pressure.
It could be that the stool leak is keeping the pump from working right but it usually takes a fair amount of water flow to make that happen as it is designed to use two faucets at the same time. I might look at the stool first on the chance it would clear the pump question???
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Richard
Why no RV year, make and floorplan on MY signature as we suggest for others?
I currently DO NOT have one! 
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