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