What was found
(CAN) JUST AFTER LEVELING OUT AT 20,000 FEET THE PILOT NOTICED THAT BOTH FUEL PUMP ANNUNCIATOR LIGHTS WERE ON AND INDICATING LOW FUEL PRESSURE. AFTER A WHILE THE YELLOW CAUTION FUEL PRESSURE LIGHT FLICKERED, SO THE PILOT DECIDED TO LAND AND INVESTIGATE. AFTER PUTTING WARM FUEL IN AND LETTING THE AIRCRAFT SIT IN A WARM HANGER THE FUEL DRAINS WERE FULL OF WATER INDICATING THAT ICE WAS THE CAUSE OF THE LOW FUEL PRESSURE BLOCKING THE FUEL FILTER.