| The
D Jetronic system was introduced in 1967 and started
appearing widespread in Volkswagens. Sensors constantly
sense the operating conditions of the engine and transmit
signals to an electrical control unit.
When
and how much fuel injected into the engine, is calculated
on intake manifold pressure and engine speed. The
most critical measure is intake manifold pressure.
For the trivia nuts, D, the first letter of D Jetronic
is also the first letter of the German word Druck
that means pressure
The
D Jetronic system relies on constant fuel pressure
if the electronic control unit is to deliver the
precise amount of fuel during different operating
conditions. To achieve this constant pressure the
fuel pump needs to be able to deliver more fuel
than the engine will ever require thus the pressure
can be regulated by re-circulating the excess fuel
back to the fuel tank.
First
we will list a brief description of each part, followed
by their operation with a few little tips we have
picked up along the way.
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