NO. I think what is happening to you here is the trigger mechanism is stuck and not opening all the way. that's what happened to me and when I tried to get it to dispense right, it blew the top off and shot it 40 feet into the air! Trust me, get the hose with the brass ends and even though it will cost you more, it is unlikely that it would burst apart and hurt you in the process. It sounds like there is some pressure in your system if the pump is coming on when you turn on the system though. It's the trigger release on the top of the can that can be a real ***** though. It sounds like your connector is making a lock to the suction side, but your dispense valve on the can doesn't work. If it's that plastic thing, well there's no suprise!