Gasoline and Diesel Fuel Injection: Operation ... - Pearson Canada

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694 CHAPTER 29 Figure 29–43 The Bosch L-Jetronic (L stands for luft, which is “air” in German) gasoline fuel injection system. The vane airflow sensor measures airflow, not mass. It is not as accurate as a mass air sensor, but it is a major improvement over speed-density systems. L-Jetronic injections are used on many European, Asian and some domestic vehicles from the mid-1970s to the mid-1990s. (Courtesy Robert Bosch) ■ Fuel heaters—Because diesel fuel has a tendency to wax and thicken when cold, electric heaters are often used to warm the fuel. Canadian diesel fuels are also blended to match seasonal temperatures; a very light fuel is supplied for winter use. ■ Fuel injection pump—Diesel fuel must be injected into the combustion chamber area at extremely high pressure, over 17 500 kPa (2500 psi), to overcome cylinder pressures. An injection pump increases fuel pressure, controls speed and power by metering the volume of fuel injected, and directs the fuel to the correct injector. It may also contain a governor, which limits the maximum RPM of the engine, and a fuel shut-off.
Gasoline and Diesel Fuel Injection: Operation, Diagnosis, and Service 695 Figure 29–44 Schematic of the fuel delivery and return on a conventional (mechanical) diesel fuel injection. (Courtesy Ford Motor Co.) Figure 29–45 A diesel fuel filter with built-in priming pump. (Courtesy Ford Motor Co.) Figure 29–46 A water/fuel separator with a water level warning light. (Courtesy Ford Motor Co.)
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