Hi, I'm breaking my head with one of these. The problem is that the water does't come out with pressure. What could it be? I have done and observed: 1)engine starts well 2) I cleaned with air pressure and put on new kits, it had 2/6 damaged. 3) the time of the pulley is well, but the pulley is wet with oil. 4) I ran the engine without the bottom of the pump to see if the pistons are moving and they are. What could it be? Thanks for the help that you can offer me.