The following schematic diagram shows the Robert-Bosch L-Jetronic Electronic Fuel Injection EFI System. The fuel system consists of: 1. fuel tank, 2. electric fuel pump, 3. expansion chamber, 4. fuel filter, 5. pressure regulator, 6. fuel ring, 7. cold start valve, 8. fuel injection valve, 9. fuel return line, 10. fuel pressure line, 11. to intake manifold.