MAINTENANCE
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HOW TO ELIMINATE AIR FROM THE FUEL SYSTEM
There are two methods to eliminate air from the fuel system according to the type of pump fitted:
See Figure D.3. The standard method is used where the fuel injection pump has vent screws 4 and 5.
The
If air enters the fuel system, it must be eliminated before the engine can be started.
Air can enter the system if:
•The fuel tank is drained during normal operation.
•The
•A part of the
In order to eliminate air from the fuel system, proceed as follows:
Standard method
1.See Figure D.3. Loosen the banjo connection bolt which is fitted on the top of the filter (1).
2.See Figure D.3. Operate the priming lever on the fuel lift pump (2) until fuel, free from air, comes from the filter vent point. Tighten the banjo connection bolt. If the drive cam of the fuel lift pump is at the point of maximum cam lift, it will not be possible to operate the priming lever. In this situation, the crankshaft must be turned one revolution.
3.See Figure D.3. Where the fuel filter is fitted lower than the fuel injection pump, loosen the inlet con- nection at the fuel injection pump (3) and operate the lift pump to remove any air. Tighten the inlet connection.
4.Ensure that the manual stop control is in the “run” position. If an electrical stop control is used, turn the start key to the “R” position.
5.See Figure D.3. Loosen the vent screw in the lock screw of the hydraulic head (4) and the vent screw on the governor cover of the fuel injection pump (5).
6.Operate the priming lever of the fuel lift pump until fuel, free from air, comes from the vent screw(s). Tighten the vent screw(s).
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FIGURE D.3 – ELIMINATING AIR FROM THE FUEL SYSTEM
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1 |
2 |
3 |
5 |
4 |
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