310T Fuel Systems – Questions With Detailed Solutions

310T Fuel Systems – Questions With Detailed
Solutions

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Technician A says that EUIs are better b. Technician B
than previous injectors because they
have no injection lag caused by
swelling pump lines and delivery
valves. Technician B says that the use
of electromagnetic solenoids by unit
injectors produces injection delay.
Who is correct?
a. Technician A
b. Technician B
c. Both Technician A and Technician B
d. Neither Technician A nor Technician
B


Technician A says that when setting b. Technician B
unit injector adjustments during
replacement, tune-up, or overhaul, the
proper operating clearance should be
adjusted using the rocker arm
adjusting screw. Technician B says that
unit injectors do not use operating
clearances and only injector preload
is set on the injector's adjuster spring.
Who is correct?
a. Technician A
b. Technician B
c. Both Technician A and Technician B
d. Neither Technician A nor Technician
B

,Technician A says that injection spray- a. Technician A
in pressure from a unit injector can
change with engine speed. Technician
B says spray-in pressures depend only
on a EUI's nozzle opening pressure.
Who is correct?
a. Technician A
b. Technician B
c. Both Technician A and Technician B
d. Neither Technician A nor Technician
B


Technician A says that the electrical c. Both Technician A and Technician B
signal to a EUI injector is pulse-width
modulated (PWM), but unlike other
PWM signals it does not have a duty
cycle. Technician B says the electrical
signal is DC current. Who is correct?
a. Technician A
b. Technician B
c. Both Technician A and Technician B
d. Neither Technician A nor Technician
B


Technician A says that an c. Both Technician A and Technician B
electromagnetic solenoid limits the
number of injection events of most
styles of unit injectors to one main
injection. Technician B says that some
unit injectors are capable of having
pilot injection events. Who is correct?
a. Technician A
b. Technician B
c. Both Technician A and Technician B
d. Neither Technician A nor Technician
B

,Technician A says that secondary a. Technician A
filters used by EUI fuel systems filter
down to 2 microns. Technician B says
that secondary fuel filters used by EUI
fuel systems filter 10-20 microns.
Who is correct?
a. Technician A
b. Technician B
c. Both Technician A and Technician B
d. Neither Technician A nor Technician
B


Technician A says that in the latest b. Technician B
EUIs, the fuel control valves control
injection timing and meter the correct
quantity of fuel for injection.
Technician B says that injection
pressure and timing are controlled by
the valves.
Who is correct?
a. Technician A
b. Technician B
c. Both Technician A and Technician B
d. Neither Technician A nor Technician
B


While discussing the installation a. Technician A
procedures for a EUI, Technician A
says that the plunger travel of the
injector is one of the last steps to
perform during injector replacement.
Technician B says that the coil
resistance and available voltage
should be checked after replacing the
injector.
Who is correct?
a. Technician A
b. Technician B
c. Both Technician A and Technician B
d. Neither Technician A nor Technician
B

, While discussing potential reasons for c. Both Technician A and Technician B
a hard start and prolonged engine
cranking period on a EUI fuel system,
Technician A suggested air could be
entering the injectors due to a poorly
seating low-pressure regulator valve.
Technician B suggested the
complaints are likely caused by a
leaking check valve in a hand primer
pump.
Who is correct?
a. Technician A
b. Technician B
c. Both Technician A and Technician B
d. Neither Technician A nor Technician
B


While discussing the potential cause a. Technician A
of a failed injector with a seized
plunger, Technician A says the failure
was likely caused by water in the fuel.
Technician B says the cause is likely a
worn plunger and barrel assembly.
Who is correct?
a. Technician A
b. Technician B
c. Both Technician A and Technician B
d. Neither Technician A nor Technician
B