Note: Before working on the power system, please read the precautions in paragraph 1.
Warning: This procedure only relieves pressure in the fuel system. Remember, however, that the fuel will still be contained in the system components, so take appropriate measures before separating the parts.
1. The fuel system discussed in this paragraph consists of a gasoline pump placed in a gas tank, a fuel accumulator, a fuel filter, fuel injectors, a fuel pressure regulator, a fuel distributor and metal pipes and flexible hoses connecting these elements.
2. All parts mentioned contain gasoline which is under pressure when the engine is running or the ignition is switched on. The system remains under pressure for some time after the ignition is turned off, and before working with any element of the system. it is necessary to reduce the pressure in the system in a controlled way. It is best to allow the engine to cool completely before carrying out repairs.
3. Refer to Chapter 12 and locate the fuel pump relay. Remove the relay from the housing, then turn the crankshaft with the starter for a few seconds. The engine may start and run for a while. However, keep turning the crankshaft until it stops. The injectors must be open enough time to reduce the pressure in the fuel line.
4. Disconnect the negative cable from the battery. Briefly open the gas tank filler cap to relieve the pressure in the gas tank. Then close the lid.
5. Place a suitable container under the appropriate connection or fitting to be disconnected and have a large rag ready to catch any gasoline that spills past the container.
6. Slowly loosen the connection or fitting nut (whatever is required) to avoid a sudden release of pressure, and cover the connection with a rag to stop a stream of gasoline that may escape from a loose connection. When the system is depressurized, disconnect the fuel line and insert plugs to minimize fuel loss and prevent dirt from entering the fuel system.