Check delivery rate of the fuel metering pump

AR83.70-D-1178E

Check delivery rate of the fuel metering pump

24.03.2020

Model

906.6/7

with code H11 (Auxiliary hot-air heater)

except code H12 (Auxiliary hot-water heater)

AIRTRONIC heater D4S

Model

907.6/7

with code H11 (Auxiliary hot-air heater)

Shown on model 906.7 with code H11 (hot-air auxiliary heater)

21

Preheating hose

25

Metering pump holder

29

Heater housing

22

Hot-air auxiliary heater connection line

26

Fuel intake line

Y23/3

Warm air stationary heater fuel metering pump (model 907.6/7)

23

Mounting bolts

27

Air intake hose

Y23/4

Metering pump (model 906.6/7)

24

Fuel pressure line

28

Combustion air hose

 Danger

Risk of explosion caused by fuel igniting, risk of poisoning caused by inhaling and swallowing fuel as well as risk of injury to eyes and skin caused by contactwith fuel.

No fires, sparks, open flames or smoking. Pour fuels into suitable and appropriately marked containers only.
Wear protective clothing when handling fuel.

AS47.00-Z-0001-01A

Topical note

Preconditions/notes regarding checking the delivery rate of the fuel metering pump

AH83.70-N-0002-01A



Remove

 Danger

Risk of death caused by vehicle slipping or toppling off of the lifting platform.

Align vehicle between vehicle lift columns and position the four support plates at the vehicle lift support points specified by the vehicle manufacturer.

AS00.00-Z-0010-01A

1

Raise vehicle.

Model 906.6/7
with code H11 (Auxiliary hot-air heater)
except code H12 (Auxiliary hot-water heater)AIRTRONIC heater D4S

AR00.60-D-1000H

Topical note

Special instructions for lifting and supporting vehicle

Model 907.6/7
with code H11 (Auxiliary hot-air heater)

AH00.60-N-0100-01TS

Model 907.6/7
with code H11 (Auxiliary hot-air heater)

AR00.60-D-1000-04TS

2

Detach fuel intake line (26) from the warm air stationary heater fuel metering pump (Y23/3) or metering pump (Y23/4) and seal with a suitable stop plug.

 Record plug

*129589009100

3

Remove, clean and reinstall the fuel strainer of the warm air stationary heater fuel metering pump (Y23/3) or metering pump (Y23/4).

4

Remove the stop plug and attach fuel intake line (26) to the warm air stationary heater fuel metering pump (Y23/3) or metering pump (Y23/4).

5

Detach fuel pressure line (24) of the warm air stationary heater fuel metering pump (Y23/3) or metering pump (Y23/4) and seal with a suitable stop plug.

 Record plug

*129589009100

6

Connect a suitable measuring hose to the pressure side of the warm air stationary heater fuel metering pump (Y23/3) or metering pump (Y23/4) and insert the end of the measuring hose into a suitable measuring glass.

 The measuring glass must have a minimum capacity of 20 ml.

7

Connect a digital multimeter for monitoring battery voltage to the on-board electrical system battery.



000 588 06 19 00 Measuring instrument

WS54.00-P-0043B

Bleeding

8

Switch on heater.

 The fuel feed starts after approx. 1 min.
To bleed the fuel line, allow the heater to run until fuel discharges steadily and free of bubbles out of the measuring hose.

9

Switch off heater.

10

Empty the measuring glass, dispose of the fuel properly and insert the end of the measuring hose back into the measuring glass.

Measure

11

Switch on heater.

 The fuel feed starts after approx. 1 min.
Hold the measuring glass level with the heater during the measurement.

12

Wait for fuel delivery to stop.

 Model 907.6/7
with code H11 (Auxiliary hot-air heater)
The auxiliary heating control unit stops the fuel feed after approx. 105  seconds.

 Model 906.6/7
with code H11 (Auxiliary hot-air heater)
except code H12 (Auxiliary hot-water heater)AIRTRONIC heater D4S
The auxiliary heating control unit stops the fuel feed after approx. 110  seconds.

13

Switch off heater.

14

Determine the feed quantity in the measuring glass and compare with the specified values.

Model 907.6/7Fuel delivery in 90 s

*BE83.70-N-1001-04A

Model 906.6/7Fuel delivery quantity in 110 s

*BE83.70-N-1002-04A

If the specified values are not reached,



Replace the warm air stationary heater fuel metering pump (Y23/3) or metering pump (Y23/4).

Model 907.6/7
with code H11 (Auxiliary hot-air heater)

AR83.70-D-5656TSR

Model 906.6/7
with code H11 (Auxiliary hot-air heater)
except code H12 (Auxiliary hot-water heater)AIRTRONIC heater D4S

AR83.70-D-5652I

15

Empty the measuring glass and dispose of the fuel properly.



Install

16

Disconnect the digital multimeter from the on-board electrical system battery.

17

Detach the measuring hose from the warm air stationary heater fuel metering pump (Y23/3) or metering pump (Y23/4), remove the stop plugs and attach fuel pressure line (24).

 Installation: Attach fuel pressure line (24) with new clamp.

 Pliers for click clamps

*171589003700



Check

 Danger

Risk of explosion caused by fuel vapors igniting, risk of poisoning caused by inhaling combustible gases and risk of injury caused by burns during and after operation of heater unit

Do not operate stationary heater, auxiliary heater or engine with heater booster in closed rooms or when refueling. Allow heater unit to cool down after operation and wear protective gloves.

AS83.70-Z-0002-01A

18

Perform a leak tightness and function test of the hot-air auxiliary heater.

 Pay attention to the operating instructions.

Check values for fuel metering pump

Number

Designation

Model 907.6/7
with code H11 (Auxiliary hot-air heater)
except code H12 (Auxiliary hot-water heater)

BE83.70-N-1001-04A

Fuel delivery in 90 s

min

cm3

11,8

max

cm3

14,4

Check values for fuel metering pump

Number

Designation

Model 901, 902, 903, 904, 905, 906
with code H11 (Auxiliary hot-air heater)
Heater D1L-C compact

Model 901, 902, 903, 904, 905, 906
with code H11 (Auxiliary hot-air heater)
Heater D3L-C compact

BE83.70-N-1002-04A

Fuel delivery quantity in 110 s

min

cm3

-

-

max

cm3

-

-

Check values for fuel metering pump

Number

Designation

Model 901, 902, 903, 904, 905, 906
with code H11 (Auxiliary hot-air heater)
Heater B3L-C compact

Model 901, 902, 903, 904, 905, 906
with code H11 (Auxiliary hot-air heater)
AIRTRONIC heater D2

BE83.70-N-1002-04A

Fuel delivery quantity in 110 s

min

cm3

-

-

max

cm3

-

-

Check values for fuel metering pump

Number

Designation

Model 901, 902, 903, 904, 905, 906
with code H11 (Auxiliary hot-air heater)
AIRTRONIC heater D4

Model 901, 902, 903, 904, 905, 906
with code H11 (Auxiliary hot-air heater)
AIRTRONIC heater D4S

BE83.70-N-1002-04A

Fuel delivery quantity in 110 s

min

cm3

-

6,0

max

cm3

-

6,5