What pressure did you get on the gauge going into the first valve with no levers pulled. Should be less that 500, hopefully less than 100. If you get like 2000 or so then you are dead heading the pump and flow is going through the pressure relief back to the tank. This is what Bunk is describing above. Show us a pic of your gauge setup so we can make sure you have it plumbed right.
Need to check these pressures before you start replacing things. Don't want to troubleshoot by replacement.
