i would take the jubilee clip off and the hose, wrap a load of ptfe tape tightly round the male tail from the pump, then push the hose over that, and wrap some more around where the jubilee clip would go, then tighten it over that, sometimes the jubilee clips can squeese, but miss squeesing one part around the hose, and that bit leaks.
The brass ones are much better, but get the ones with the metal balls that hold the connector in rather than brass ones with the plastic clips inside.