You may have a bad O-ring on the fill/city water valve and it's leaking through there. Open/close that valve (twist back and forth) a few times to see if it might reseat the O-ring.
The speed fill is actually the tank vent. As the tank fills, the air vents out that port. When full, it flows water to prevent "exploding the tank" from built up pressure.
It's also used as an "emergency tank gravity fill" by removing the screen and inserting a small hose into the port to pour water from 5 gallon containers into the tank. Some people buy a "water bladder" and use a 12 volt pump to push water into the vent.
You might have "sucked some debris" into the pump diaphragm. If there's no inlet screen on your water pump supply hose, you can buy one of these for about $10 from Amazon. That will "screen out any plastic shards or other small pebbles/sand that might have found their way into the fresh water tank.
The first thing I'd do is remove the pump take the pump head off, clean the diaphragm and reassembly/reinstall the pump. If it still leaks, your two choices are a one way valve in the pump output line (my second choice) or to buy a new pump. If under warranty (2 years if it's a FloJet) the replacement should be free.
https://www.amazon.com/Flojet-017403...s%2C200&sr=8-4 Cost is about $9. If your pump is a ShurFlo, the fittings are different and this won't fit, but there are strainers available for any RV water pump.