Quote Originally Posted by mas985
Lower PSI usually means a suction side restriction or problem. Do you see air in the pump basket? If so, check the skimmer basket(s) and pump basket for any blockage. Also check your valve settings if you have any.

It could also be that there is something on the pump impeller but to find out, you would need to disassemble the pump.

Also, because of the suction problem, the pump may be overheating and shutting down. If you fix your other problem, the pump may still be ok.
I don't want to hijack this thread, but I have a similar problem. Turned on the pump yesterday and got NO reading on the pressure gauge. Skimmers and bottom drain seem to be working fine, though. Turned on my vacuum (polaris 360) and the pressure went up to about 12 (normally it is at 25 when vacuum is on). Normally when the skimmer and drain are on, the pressure is at 12. The pump sounds fine, and has not shut off. No air bubbles in the filter basket. Also, i released the pressure in the valve and ran the pump, and water came out of the release hose.

This is a bad question, but what do you mean by "suction side restriction?"

Are there any good tutorials on how to disassemble and unclog and impeller?