(4) Nut for the fuel line to the air inlet heater
If the fuel line for the air inlet heater has been drained,
loosen the nut for the fuel line nut (4) at the air inlet
heater. Operate the priming lever on the bottom of the
fuel transfer pump (3) until fuel, which is free of air,
flows from the fuel line. Tighten the nut for the fuel line
to the air inlet heater (4) to a torque of 22 Nom (16 Ib-ft).
(5) Nuts for the fuel line to the fuel injector nozzles
Air from the fuel lines is also removed by loosening the
nuts for the fuel line nuts (5) at the fuel injector nozzles.
Operate the starting motor until the fuel, which is free of
air, flows from the fuel line. Tighten the nuts for the fuel
lines (5) to a torque of 22 Nom (16 Ib-ft).
If the starting motor is operated too long in order
to purge the air from the fuel system, parts can be
damaged. Damage to the fuel injection pump, the
battery, and the staring motor can occur.
Remove Air From The Fuel System On Type
2 Engines and 7BJ Engines
For a complete description of Type 1 and Type 2
engines, refer to the Systems Operation, Testing
and Adjusting Module, "Engine Design" for more
If air enters the fuel system, the air must be purged before the
engine can be started. Air can enter the system when the
following events occur:
The fuel tank is empty or the tank has been partially
The low pressure fuel lines are disconnected.
A leak exists in the low pressure fuel system.
The fuel filter is replaced.
Use the following procedure in order to remove air from the
Fuel filter and venting the fuel filter
Fuel filter and filer assembly (Lucas Fuel Systems).
(1) Vent plug
(2) Fuel filter and fuel filter head assembly
(3) Fuel transfer pump