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27.4 Priming Fuel System
The mechanical fuel lift pump is mounted on the engine next to the injection
pump. This pump has a manual plunger for priming the fuel system when the
fuel tank has been run dry.
WARNING
!
Keep clear of rotating belt and pulleys.
Follow these steps to prime the fuel system:
1. Turn the bleed valve (red) counter-clockwise until fully opened.
2. Turn the top of the manual fuel pump plunger counter-clockwise to unlock
it. S-L-O-W-L-Y (up/down once per second) pump the manual plunger until
positive pressure (resistance) is felt. This may take up to 200 strokes.
Positive pressure indicates fuel flow.
3. Continue to pump S-L-O-W-L-Y (up/down once per second) approximately
100 more strokes to fill the filter and bleed the air out of the lines.
4. Start engine. It may be necessary to continue to pump until the engine
starts.
NOTE
Running the engine for an extended period of time with the manual
plunger up can cause a priming pump failure.
5. Depress and turn the top of the manual plunger clockwise to lock in place.
6. When engine is running smoothly, turn bleed valve clockwise until fully
closed.
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