I have a 2005 200 HPDI and this past week I replaced the Pressure Control Valve (poppit valve) and the water pump. Good thing I did because I found the "large" o-ring for the water pump housing was broken. Well, I took it out this morning and when I started it I had 6 psi of water pressure at idle and a VERY good stream of water from the motor. I ran the boat and had 20+ psi at WOT. After a few runs and I noticed I my water pressure gauge of reading zero at idle again (read this before the change). Still had a decent water stream from the motor. When I ran the boat I had 8 psi at 4000 rpm and when I got to WOT I had about 10-12 psi. Any ideas what the problem is? How much water pressure do they normally have at idle? Thanks for any help.