Deck 28: Electronic Unit Pump Eup Systems

Question 1

Which of the following represents a significant DIFFERENCE between an electronic unit pump (EUP) when compared to a typical electronic unit injector (EUI) system?

A) plungers are mechanically actuated
B) ECM manages effective stroke
C) fuel is delivered to pump chambers at charging pressure
D) injection pressure fuel is delivered to an injector nozzle by high pressure line

Answer 1

injection pressure fuel is delivered to an injector nozzle by high pressure line

Question 2

How many electronic unit pumps (EUPs) are required to fuel an in-line, 6 cylinder engine?

A) one
B) two
C) three
D) six

Answer 2

six

Question 3

Technician A says that EUPs are mechanically-actuated by a cylinder block mounted camshaft. Technician B says that SMART injectors supplied by high pressure lines are used on second generation EUP fuel systems. Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Answer 3

Both A and B

Question 4

What is another way of describing a SMART injector?

A) Hydraulic injector
B) Electrohydraulic injector (EHI)
C) EUI
D) Pintle injector

Question 5

What type of fuel transfer pump is used on a Mack Trucks (up to 2017) and Paccar MX EUP MY 2010-2013 fuel systems?

A) gear type
B) plunger type
C) vane type
D) centrifugal type

Question 6

How is the Mack Trucks V-MAC III engine ECU cooled?

A) ram air
B) fuel
C) coolant
D) internal fan

Question 7

Which of the following fuel sub-system components is NOT under suction in a V-MAC III EUP fuel system?

A) fuel tank
B) primary filter
C) ECU
D) secondary filter

Question 8

When attempting to prime a Mack Trucks E7 EUP fuel subsystem, which of the following fittings should be cracked before actuating the hand primer pump?

A) fuel tank breather vent
B) primary fuel filter outlet
C) ECU cooling plate inlet
D) secondary filter inlet

Question 9

What is the term used to describe the electronic connection between the Mack Trucks, MB and Paccar chassis modules and the engine ECM modules?

A) proprietary multiplex bus
B) fiber optic cable
C) parallel port hard wire
D) wireless

Question 10

What is the specified NOP value on a pre-2007 Mack E-Tech, EUP fueled engine?

A) 100 psi
B) 2000 psi
C) 5000 psi
D) 26,000 psi

Question 11

What is the peak system pressure achieved by pre-2007 E-Tech, EUP fuel systems?

A) 100 psi
B) 2000 psi
C) 5000 psi
D) 26,000 psi

Question 12

What determines actual plunger stroke in any EUP fueled engine?

A) ECU drivers
B) plunger radial dimension
C) radial dimension of EUP roller bearing
D) cam profile

Question 13

What controls the length of plunger effective stroke in a EUP system?

A) time EUP solenoid is energized
B) tappet stroke
C) time nozzle is open
D) cam profile

Question 14

What should be done before removing an EUP from an engine cylinder block?

A) drain the engine oil
B) drain the fuel manifold
C) clamp the EUP retraction spring
D) remove the camshaft

Question 15

When installing an EUP to an engine cylinder block, how should the O-rings be lubricated?

A) install dry
B) fuel
C) engine oil
D) silicone

Question 16

After replacing an EUP in a fueled engine, which of the following should be performed to ensure balanced fueling?

A) program 4-digit CAL code to ECU
B) program 2-digit alpha code to ECU
C) run a cylinder cut-out test
D) reset the governor type to VS

Question 17

Technician A says that all of the high pressure lines used in a Mack E-Tech EUP fuel system use identical pipes with common part numbers. Technician B says that the high pressure pipes used with pre-2007 EUP fuel systems connect directly to the inlet ports on hydraulic injectors. Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 18

Technician A says that an EUP high pressure pipe is designed for one-off use only. Technician B says that EUP roller lifters ride directly on the cam profiles that actuate them. Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 19

What should be used to remove an EUP unit from an engine cylinder block?

A) slide hammer on outlet pipe nipple
B) injector heel bar on flange bosses
C) remove camshaft, drive out with punch
D) chisel under flange bracket

Question 20

What must be used to program new EUP calibration codes to a Paccar MX MY 2010-2013 engine ECMs?

A) digital multimeter
B) DAVIE software and Paccar CA
C) Co-Pilot digital driver unit
D) toggling cruise switches

Question 21

What acronym does Mercedes Benz use for the engine controller module used on pre-2007 versions of MB-900 and MB-4000 engines?

A) ECM
B) ECU
C) VCU
D) PLD

Question 22

Technician A says that MB-4000 engine controllers are designed to broadcast data on a J1939 data bus. Technician B says that because MB-900 engines are built offshore the data bus will not display the SAs, MIDs, PGNs, PIDs, SIDs and FMIs that enable generic readers to access the electronics. Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 23

Which company manufactures EUP-fueled engines that are MY 2010-2013 EPA compliant?

A) Mack
B) Mercedes Benz
C) Paccar
D) MAN

Question 24

Which of the following is the key technical difference between EUP fueled engines manufactured before 2007 and those manufactured after that date?

A) twin turbos
B) EGR
C) SMART injectors
D) paint color

Question 25

What term is often used to describe an electrohydraulic injector (EHI) when it is used in an EUP fuel system?

A) mechanical injector
B) hydraulic injector
C) multi-orifii injector
D) SMART injector

Question 26

What management system is used by Mercedes Benz to control their post-2007 family of EUP fueled engines?

A) V-MAC III
B) V-MAC IV
C) DDEC
D) PLD-electronics

Question 27

Technician A says that post-2007 EUP fueled engines use EHIs with multipulse injection capability. Technician B says that the EHI NOP depends on a specific EUP hydraulic pressure. Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 28

Which of the following is true regarding EHI nozzle opening?

A) requires a hydraulic pressure of 3,000 psi
B) requires a hydraulic pressure of 5,000 psi
C) takes place whenever ECM drivers energize the EUP control cartridge
D) takes place whenever ECM drivers energize the EHI actuator

Question 29

Technician A says that EHI opening is soft. Technician B says that EHI opening pressure is controlled by the ECM. Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 30

What are the main advantages of using EHIs in place of hydraulic multi-orifice injectors in an EUP fuel system?

A) soft opening pressures
B) faster response times
C) elimination of the collapse phase
D) all of the above