[A bones]

My method would be to use those giant Channel Locks to bite the hose at the pump neck.
Try to twist ( rotate ) the hose a little to loosen the bond.
If not successful then hose down the hose end, and pump neck with WD40 and find something else to do for a while.
Given time, the juice will seep in and soften the bond between the two.
Repeat channel lock.