Content .. 5 6 7 8 ..

AIRTRONIC / AIRTRONIC M. Manual - part 7

Fuel supply

Fuel feed point with T-piece from the fuel supply line
from the tank fitting to the vehicle engine

Fuel flow line, vehicle tank

To the vehicle's engine, mechanical fuel or
injection pump

T-piece, 8-6-8 or 10-6-10

Dosing pump

Fuel pipe, 4 x 1 (di = Ø 2 mm)

Fuel pipe, 6 x 2 (di = Ø 2 mm)

Fuel hose, 5 x 3 (di = Ø 5 mm)

8* Fuel pipe, 4 x 1.25 (di = Ø 1,5 mm)
9

Adapter Ø 6 / 4

10 Fuel hose, 3.5 x 3 (di = Ø 3.5 mm),

approx. 50 mm long

11 Fuel hose, 5 x 3 (di = Ø 5 mm),

approx. 50 mm long

12 Pipe connectors, da = Ø 4 mm
13 Fuel filter - required for contaminated fuel only.

* If necessary, a fuel pipe 4 x 1 (di = Ø 2 mm) can

be used for diesel heaters instead of the fuel pipe
4 x 1.25 (di = Ø 1.5 mm), Item (8).
The details regarding the pipe lengths remain
unchanged.
The fuel pipe, 4 x 1 must be order separately,
Order No. see spare parts list or additional parts
catalogue.

Installation

• Insert the T-piece (3) in the fuel flow line upstream of

the feed pump.

• Items (5), (9) and (12) are included in the "Plus"

installation kit only.

• Item (6) is included in the universal installation kit

only.

• Items (7) and (13) must be ordered separately. The

order no. is given in the additional parts catalogue.

Please note!

Installation position of the T-piece

Use the installation positions shown in the diagram
when inserting a T-piece.

Direction of flow from the fuel tank

Direction of flow to the vehicle engine

Possible pipe lengths

Intake side
Airtronic
a = max. 5 m

Airtronic M
a = max. 2 m

Pressure side
Diesel heaters
• For suction pipe di = Ø 2 mm,

b = max. 6 m

• For suction pipe di = Ø 5 mm,

b = max. 10 m

Petrol heater
• b = max. 4 m

Fuel feed point with tank connection – ascending pipe,
integrated in the vehicle tank or in the tank fitting

Tank connection for metal tank -
di = Ø 2 mm, da = Ø 6 mm

Tank connection for tank fitting -
di = Ø 2 mm, da = Ø 4 mm

Dosing pump

Fuel pipe, 4 x 1 (di = Ø 2 mm)

Fuel pipe, 6 x 2 (di = Ø 2 mm)

Fuel hose, 5 x 3 (di = Ø 5 mm)

Fuel filter - required for contaminated fuel only.

8* Fuel pipe, 4 x 1.25 (di = Ø 1,5 mm)
9

Pipe connectors, da = Ø 4 mm

10 Fuel hose, 3.5 x 3 (di = Ø 3.5 mm)

approx. 50 mm long

11 Adapter Ø 6 / 4
12 Fuel hose, 5 x 3 (di = Ø 5 mm),

approx. 50 mm long

* If necessary, a fuel pipe 4 x 1 (di = Ø 2 mm) can

Fuel supply

• Items (2), (4), (8), (9) and the connection parts are

included in the “Tank Connection” kit, Order No. 22
1000 20 13 00 (The “Tank Connection” kit is included
in the "Plus" installation kit).

• Item (5) is included in the universal installation kit

only.

• Item (11) is included in the “Plus” installation kit only.
• Items (6) and (7) must be ordered separately, for Order

No. please refer to additional parts catalogue.

• When installing tank connection maintain a minimum

distance of 50 ± 2 mm from the end of the riser pipe
and the bottom of the tank.

• Consult the vehicle manufacturer before installing the

tank connection in a metal tank.

Installation

Caution!

Safety instructions for the fuel supply!

• The fuel must not be conveyed by gravity or

overpressure in the fuel tank.

• Withdrawal of fuel after the vehicle’s fuel pump is

not allowed.

• When the pressure in the fuel pipe is more than

0.2 bar to max. 4,0 bar, use a pressure reducer
(order no. 22 1000 20 08 00) or separate tank
connection.

• When the pressure in the fuel pipe is more than

4,0 bar or there is a non-return valve in the return
pipe (in the tank), a separate tank connection must
be used.

• When using a T-piece in a plastic pipe, always use

support sleeves in the plastic. Connect the T-piece
and the plastic pipe with corresponding fuel hoses
and secure with hose clips.

Please note!

Possible pipe lengths

Intake side
Airtronic
a = max. 5 m

Airtronic M
a = max. 2 m

Pressure side
Diesel heaters
• For suction pipe di= Ø 2 mm,

b = max. 6 m

• For suction pipe di= Ø 5 mm,

b = max. 10 m

Petrol heater
• b = max. 4 m

Possible suction and pressure height
of the dosing pump

Pressure height from vehicle tank to dosing pump:
a = max. 3000 mm

Intake height in pressure-less vehicle tank:
b = max. 1000 mm for diesel
b = max.

500 mm for petrol

Intake height in vehicle tanks with withdrawal by
negative pressure (valve with 0.03 bar in tank cap):
b = max. 400 mm

Pressure height of the dosing pump to the heater:
c = max. 2000 mm

Check tank venting.

Connection to heater

Max. fuel level

Min. fuel level

Installation

Fuel supply

Installation position of the dosing pump

Always mount the dosing pump with the pressure side
rising upwards. Every installation position over 15° is
allowed, although an installation position between 15°
and 35° is preferable.

Installation position between 0° and 15°
is not allowed.

Preferred installation position in range 15° to 35°.

Installation position in range 35° to 90° is allowed.

Caution!

Safety instructions for installing
the dosing pump
• Always mount the dosing pipe with the pressure

side rising upwards – minimum incline 15°.

• Protect the dosing pump and filter from intolerable

heat, do not mount near to the silencers and
exhaust pipes.

Please note!

Installation

Fuel supply

Caution!

Fuel supply safety information
It is not permitted to operate the heater with
unapproved fuel / fuel mixtures or the addition of used
oil.
Failure to comply with this can lead to personal
injuries as well as a malfunction or damage to the
heater.
Only the fuel approved by the manufacturer or by the
vehicle manufacturer is to be used.

Fuel quality for petrol heaters
The heater runs without problems on normal
commercial petrol according to DIN EN 228.

Fuel quality for diesel heaters
• The heater runs without problems on normal

commercial diesel fuel according to DIN EN 590.
During the winter months the diesel fuel is adapted to
low temperatures from 0 °C to –20 °C. Problems can
therefore only arise if outdoor temperatures are
extremely low - which also applies to the vehicle's
engine - please refer to the vehicle manufacturer's
regulations.

• In special cases and at outdoor temperatures above

0 °C the heater can also be run on heating oil EL
according to DIN 51603.

• If the heater is run from a separate tank, please

comply with the following rules:

– if outdoor temperatures over 0 °C,

Use diesel fuel according to DIN EN 590.

– if outdoor temperatures from 0 °C to –20 °C,

Use winter diesel fuel according to DIN 590.

- if outdoor temperatures –20 °C to –40 °C,

Use Arctic Diesel or Polar Diesel.

After refuelling with winter or cold diesel, the fuel
pipes and the metering pump must be filled with the
new fuel by letting the heater run for 15 min!

Please note!

Operation with biodiesel (FAME)

Airtronic
The heater is not approved for operation with bio
diesel fuel (FAME). Up to 10 % bio diesel fuel (FAME)
may be added.

Airtronic M
The diesel heater is approved for operation with bio
diesel fuel (FAME) according to DIN EN 14 214.

• Bio diesel fuel (FAME) according to DIN EN 14 214

– during the winter months is adapted to low

temperatures from 0 °C to –20 °C.

– The Flowability reduces at temperatures below

0 °C.

• When using 100 % bio diesel, the heater should be

operated twice a year with diesel fuel (in the middle
and at the end of a heating period) in order to burn
off any possible biodiesel residues deposited.
To do so, let the vehicle tank run almost empty and
then fill with diesel fuel. While running on this tank
filling, switch the heater on 2 to 3 times for 30
minutes at a time at the highest temperature setting.

• When operating with diesel / bio diesel mixtures of up

to 50 % bio diesel, intermediate operation with pure
diesel fuel is not necessary.

Please note!

Content .. 5 6 7 8 ..