With pump off remove washer/screen on city water inlet.
n the center of inlet is the tip of a small plunger (internal check valve to stop water from flowing out)
Push it in and then let it go---it MAY reset it
Turn pump n and check.
If it still leaks......you can cap it off with a 3/4" PVC plug, install a garden hose shut-off valve OR replace the city water assembly.
I installed a 90* elbow and a shut-off valve and just leave them on. 6 yrs. and no issues..plus when I hook up hose it hangs straight down.