Hello I'm new here Ive been running a harbor freight water transfer pump from my 100gal water tank to my ryobi 3000psi pressure washer. After it sat for 1 month unused, my pump transfer the water as usual unhooked from the pressure washer but as soon as I connect it to the pressure washer it sprays out the washer for 5 seconds then stops sending water. The whole time I hear it working but it acts as if it don't have enough pressure to send it. Thought the pressure washer had a issue so I connected it to the house water supply and it works perfectly. I'm looking at a more expensive pump currently. The seaflo 55 series with higher GPM. Just wondering what the issue could be before I buy a new pump. Should I maybe warm the pump up with my heat gun?