Fuel distribution line
1 - vacuum hose fuel pressure regulator
2 - fuel pipe
3 - attachment point
4 - fuse
New injectors are preserved. After 5 minutes of operation, they are released from conservation due to the passing fuel. After removal from the engine, the injectors should not be stored for a long time due to the risk of corrosion.
Withdrawal
1. Remove the air box, refer to Section Removal and installation of the air intake box.
Models 316i, 318i
2. Remove the upper part of the inlet pipeline, refer to Section Removal and installation of the inlet pipeline.
The fuel system is under pressure! Place a thick cloth on the hose connection before loosening it. Then carefully relieve the pressure in the hose. There is a risk of fire, do not smoke.
3. Clean fuel lines. Then unscrew the supply and return pipes.
4. Turn out 2 bolts of fastening of the fuel distributive highway.
Models 320i, 323i, 328i
5. Remove the engine top cover.
6. Turn away screws of fastening -1- and remove a plug level upwards from injectors.
7. Remove the fixing screws (arrows in the illustration) fuel distribution line. Note: The engine cover is not shown in the illustration.
8. Disconnect the oxygen sensor connector (2 arrows on the right).
9. Remove the plug-in strip of the injectors and lay aside.
The fuel system is under pressure! Place a thick cloth on the hose connection before loosening it. Then carefully relieve the pressure in the hose. There is a risk of fire, do not smoke.
10. Clean fuel lines with cold cleaner. Then, first disconnect the fuel supply line -1- (from the filter), and then the return hose -2- on the fuel distribution line, for which loosen the clamps. After unscrewing, the clamps must be replaced with new ones.
Label hoses to avoid confusion during reassembly (refer to illustration).
11. Some models have fuel hoses secured with retaining clips. To remove, squeeze the staples with HAZET No. 4501-1 pliers or a similar tool (arrows in the illustration).
12. Turn out bolts of fastening (arrows in the illustration) fuel distribution line.
13. Disconnect the vacuum hose -1- at the fuel pressure regulator.
14. Take out the fuel distributive highway complete with injectors upwards from a head of cylinders. The injectors are simply inserted and can be easily removed.
15. Remove the fuse and remove the injector.
Installation
Replace deformed O-rings -1-, remembering the position of the rings -2-. Lubricate the rings -1- before installation with petroleum jelly or transmission oil. Do not use engine oil, it will adversely affect rubber.
16. Insert the injectors into the fuel distribution line and secure with brackets.
17. Evenly press the fuel distribution line with injectors into the cylinder head.
18. Fix the fuel distributive highway on a head of cylinders.
19. Fix hoses of return and giving of fuel on a distributive highway. Install new clamps and o-rings, refer to subsection "Withdrawal".
20. Install the plug-in strip for the injectors and secure it.
21. Connect a vacuum hose to the fuel pressure regulator.
22. Models 316i, 318i: Establish the top part of the inlet pipeline, address to Section Removal and installation of the inlet pipeline.
23. Models 320i, 323i, 328i: Connect the connectors of the oxygen sensors and secure them. Fasten the engine cover.