VALVE AS 5505773 - Caterpillar

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 fitting. Tighten the bolt (1). 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) Fuel line nut
The manual stop control (if equipped) must be in the run position. If an electrical stop control is used, the ignition key must be in the run position.
Loosen the fuel line nut (4). Operate the priming lever on the bottom of the fuel transfer pump (3) until fuel, which is free of air, flows from the fitting. Tighten the nut for the fuel line (4) to a torque of 22 N m (16 lb ft).
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(5) Fuel line nuts
Loosen the fuel line nuts for two of the fuel injection nozzles.
The manual stop control (if equipped) must be in the run position. 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 N m (16 lb ft).
The engine is now ready to start. Operate the engine at low idle for a minimum of five minutes immediately after air has been removed from the fuel system. Running the engine for this period of time will help ensure that the pump is completely free of air. Damage to the internal parts of the pump which is caused by metal to metal contact will be prevented. The fuel system may need to be primed or the fuel system may have a fuel leak if the following conditions exist:
The engine will not start.
The engine continues to misfire.
The engine smokes.
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, to the battery, and to the starting motor can occur.
Remove Air From The Fuel System (S/N: 5YS; 7MS; 2PW; 3GW)
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 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 Delphi fuel systems)
(1) Vent plug
(2) Fuel filter base
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(3) Fuel transfer pump
Bosch and Delphi fuel systems. Loosen the vent plug (1) on top of the fuel filter base. Operate the priming lever on the bottom of the 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)