TM 9--2350--292--20--20614 00--2AUXILIARY POWER UNIT FUEL SYSTEM SERVICE -- CONTINUED0614 00Service--ContinuedNOTEIf no fuel flows when fuel transfer pump priming lever ismoved, APU engine camshaft pump lobe is in up posi-tion. Turn APU engine one revolution to allow hand prim-ing.Fuel lines retain fuel when disconnected. Do not stoppriming until fuel has moved completely through systemand all air is purged.4. Operate priming lever (4) on fuel transfer pump (5). Watch for air bubbles in fuel flowing out of APU quick--discon-nect coupling half (2).5. When flow is free of bubbles, release valve (3) in APU quick--disconnect coupling half (2), reconnect vehicle fuelreturn line (1) at APU quick--disconnect coupling half (2).6. Return priming lever (4) to full down position.Figure 33823145
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