Hi my name is ***** ***** I will assist you today.
To clarify you are connecting a hose pipe connector on to the pressure washer, but when you turn it on the water isnt under pressure or cuts out when using it?
This would normally suggest a lack of water going into the pressure wasaher, it may be worth ensuring the outside tap is turned on full. and ther.e are no kinks in the hose pipe which is connected to the pressure washer.
If you still have issues it may be worth removing the nozel and checking water flows throught he pressure washer when used without the nozel.