How to eliminate air from the fuel system of the
fuel injection pump fitted with In-line PB
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 low-pressure fuel pipes are disconnected
A part of the low-pressure fuel system leaks during engine operation.
In order to eliminate air from the fuel system, proceed as follows:
Attention.
The fuel of the engine must not contaminate the engine compartment. An oil-dripping plate shall be put
at the bottom of the engine and remove the used fuel according to the local regulations.
1．Loosen the vent plug on the top of the twin element fuel filter (A1) by turning it 2-3 turns and operate the lift pump
until fuel, free from air, comes from the connection.Tighten the vent plug.
2. Loosen the banjo connection bolt which is fitted on the top of the filter (B1) and operate the lift pump until fuel,
free from air, comes from the connection. Tighten the banjo connection bolt.
3．If the fuel pipe on the fuelled starting aid has been emptied, loosen the union nut (A1) at the fuelled starting aid (if
one is fitted) and operate the lift pump until fuel, free from air, comes from the connection. Tighten the union nut at
the starting aid. A wrench shall be put on the nut head of fuelled starting aid device to prevent the movement during
tightening or loosing the union nut.
4. Ensure that the stop control is in its "run" position and the speed control in its full position. Operate the starter
motor. Reduce the speed of engine when the engine runs. If the engine runs correctly for a short time and then stops
or runs roughly, check for air in the fuel system. If there is air in the fuel system, there is probably a leakage in the
low pressure system.
4.15
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