B3.9 and B5.9 Series Engines
Injector Supply Lines (High Pressure) (006-051)
Section 6 - Injectors and Fuel Lines - Group 06
Shown here are the high-pressure fuel lines for the Bosch
n-line injection pump.
Do not weld or substitute lines; use only the specified part
number for the engine.
The length, internal size, and rigidity of the lines are critical
to smooth engine operation. An attached metal tag is used
to identify each line with a part number.
A metal tag attached to each line identifies the line with a
Keep hands and body parts away from the high-pressure
fuel lines. Fuel coming from the high-pressure fuel lines
is under extreme pressure and can cause serious injury
by penetrating the skin.
Use cardboard to check for cracks and leaks. With the
engine running, move the cardboard over the fuel lines,
and look for fuel spray on the cardboard. Fuel leaks can
cause poor engine performance.
It is normal to have entrappd air in the fuel lines after
replacing the pump or the lines. Air in the lines will cause
the engine to run rough or produce a fuel knock.