Hi all, new guy here. I have a craftsman 580750910 pressure washer. I just got it out today. Its been sitting for a year n a half. It started up but when I pull the trigger on the gun it dies. When I try to restart the pull string starts to get hard to pull. Also if I let in sit just running I saw water coming out if the thermal relief valve. Is that normal? Anyways I took the unloader valve out and disassembled it and didn't see much wrong. I did notice the plunger is very hard to depress when I put it back together. The spring for it is very stiff. I reassembled and it's doing the same thing. Any thoughts? Thanks.