0343977 JOHNSON SPRING, Thermostat relief (yellow)

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(1) Vent plug (2) Fuel filter base
Loosen vent plug (1) on top of fuel filter base (2) .
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(3) Fuel transfer pump
Operate the priming lever on the bottom of fuel transfer pump (3) until fuel, which is free of air, flows from the vent plug. Tighten the vent plug.Note: If the drive cam of the fuel transfer pump is at maximum lift, the priming lever cannot be operated. The crankshaft must be rotated one revolution.
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(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 to air inlet heater (4). Operate the priming lever on the bottom of fuel transfer pump (3) until fuel, which is free of air, flows from the fuel line. Tighten the nut for the fuel line to air inlet heater (4) to a torque of 31 N m (23 lb ft).
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(5) Nuts for the fuel line to the fuel injection nozzles (typical example)
Air from the fuel lines is also removed by loosening the nuts for the fuel line to fuel injection nozzle (5). Operate the starting motor until the fuel, which is free of air, flows from the fuel line. Tighten the nuts for the fuel line to fuel injection nozzle (5) to a torque of 22 N m (16 lb ft).
Do not crank the engine continuously for more than 30 seconds. Allow the starting motor to cool for two minutes before cranking the engine again.
Dual Element
If air enters the fuel system, the air must be purged before the engine can be started. Air can enter the fuel system when the following events occur:
The fuel tank is empty or the tank has been partially drained.
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 system:
Vent air from the primary fuel filter and from the secondary fuel filter.
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Primary fuel filter, Secondary fuel filter, and fuel filter base (Bosch and Lucas Fuel Systems) (1) Vent plug (2) Fuel filter base
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(3) Fuel transfer pump
Bosch and Lucas fuel systems.Loosen vent plug (1) on top of the fuel filter base. Operate the priming lever on the bottom of fuel transfer pump (3) until fuel, which is free of air, flows from the vent plug. Tighten the vent plug.
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Fuel filter assemblies (Stanadyne Fuel System) (1) Vent plug for the primary fuel filter (2) Vent plug for the secondary fuel filter
Stanadyne fuel systemLoosen vent plug (1) on top of the primary fuel filter base. Operate the priming lever on the bottom of fuel transfer pump (3) until fuel, which is free of air, flows from the vent plug. Tighten the vent plug.Loosen vent plug (2) on top of the secondary fuel filter. Operate the priming lever on the bottom of fuel transfer pump (3) until fuel, which is free of air, flows from the vent plug. Tighten the vent plug.Note: If the drive cam of the fuel transfer pump is in the position of maximum cam lift, the priming lever will not operate. The crankshaft must be rotated one revolution.
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(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 to air inlet heater (4). Operate the priming lever on the bottom of fuel transfer pump (3) until fuel, which is free of air, flows from the fuel line. Tighten the nut for the fuel line to air inlet heater (4) to a torque of 22 N m (16 lb ft).
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(5) Nuts for the fuel line to the fuel injection nozzles
Loosen the connections for the high pressure fuel lines on two fuel injection nozzles. Operate the starting motor until fuel, which is free of air, flows from the fuel line. Tighten the nuts for the fuel line to fuel injection nozzles (5) to a torque of 22 N m (16 lb ft).Note: Damage