Tried that but still the same thanks
Uncoil the hose and lay it out straight. Then fill a barrel with hot water (just less than 60 degrees at that's the most a Shurflo pump will handle) and 'flush' the hose. When its hot switch off the tap and the other end and when the hose is pressurized, leave it for a while under pressure.
I'd be pretty sure there is a 'kink' in the hose as it would be hot when reeled up after manufacture.
A WFP pump will never pump water through the pole hose at the rate you are expecting. It's always going to be slower at the other end as there is a restriction in the hose. The faster you try to push water through it the slower it will flow. In fact, you might even find it flows faster if you reduce the flow on the controller.
I put up a long explanation on the forums a while back about the effect of turbulence in a water pipe.