TM 9-2350-267-10TROUBLESHOOTING - ContinuedMALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTIONAUXILIARY POWER UNIT ENGINE - Continued19. APU ENGINE STARTS, THEN STALLS OR RUNS ROUGHLYStep 1.Step 2.Step 3.Check for water in fuel filters.Drain filters (p 3-47).Check air intake filter for restrictions.Remove restrictions or clear filters (p 3-47),Check fuel level.Fill fuel tanks (p 3-25).20. APU ENGINE DIFFICULT TO STARTStep 1. Check for water in fuel filters.Drain filters (p 3-47).21. APU ENGINE HARD TO START ONLY IN COLD WEATHERStep 1. Check to see if plenum door in APU compartment is open.Open plenum door.22. APU ENGINE OVERHEATINGStep 1.Step 2.Check air intake passage for obstruction.Remove obstruction.Check crankcase oil level (LO 9-2350-267-12).Refill with oil as necessary.3-12
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