What was found
(CAN)BOOST PUMP LOW PRESSURE WARNING LIGHT ON, FUEL FILTERS CHECKED FOUND SCREENS COATED IN WAX VISCOUS SUBSTANCE. ENGINE RUN, BOOST PUMP PRESSURE DROPPED TO ZERO AND #2 PUMP WARNING LIGHT ON. AIRCRAFT TAKEN INTO HANGAR TO WARM UP. PROBLEM DISAPPEARED. FUEL SAMPLE TAKEN AND SENT FOR ANALYSIS.