Installing The Metering Pump; Fuel Tank Removal Kit - Truma Combi D 6 AU Installation Instructions Manual

Installing the metering pump

Always install metering pump with the pressure side (delivery
direction) sloping upwards.
Protect metering pump from heat (max. operating temper-
ature 40 °C), therefore do not install in the vicinity of sound
mufflers and exhaust pipes.
Metering pump installation position
Fig. 20
Permissible metering pump intake and pressure levels
a
b
Fig. 21
Pressure level from fuel tank to metering
pump:
Intake level with depressurised fuel tank: b = max. 1,000 mm
Intake level with fuel tank in which neg-
ative pressure occurs during removal
(valve with 3 kPa in tank cap):
Pressure level from metering pump
to heater:
Attaching the metering pump
Attach metering pump (27) to vehicle in a suitable location us-
ing bracket (28) and holder (29) (included in scope of delivery).
90°
Fig. 22
8
c
a = max. 1,500 mm
b = max. 400 mm
c = max. 2,000 mm
28
27
29
Connect unit and metering pump to fuel pipe
Mark hole for leading through fuel pipe (in soundproofing
hose) and metering pump connecting cable on floor of vehicle
in a suitable location.
Before drilling, always check for underlying / concealed
cables, gas lines, frame sections and the like!
Then seal the edges of the openings in the floor of the vehicle
with underbody protection.
Route fuel line and metering pump connecting cable so that
they will not chafe. Please also use leadthrough bushings or
edge protection profiles in locations where sharp edges such
as metal panel leadthroughs are present.
Route pressure-side fuel line in provided soundproofing hose
made from cellular rubber.
Allowing the fuel lines to come into contact with vehicle
components or overtightening the cable binders may re-
sult in metering pump noise transmission (clicking).
Connect fuel line (in soundproofing hose) to unit and
metering pump as shown in diagram. Secure soundproofing
hose and connecting cable to vehicle using hose holders
(part no. 34020-76000) or attach loosely with cable binders
(approx. every 50 cm).
35
33
34
27
37
Fig. 23
30 = Fuel line connection to unit
31 = Fuel hose 90° elbow
32 = Fuel line, inner diameter 2 mm (pressure line)
33 = Cellular rubber soundproofing hose
34 = Fuel hose
35 = Clamps
36 = Metering pump connecting cable
37 = Suction line from vehicle fuel supply

Fuel tank removal kit

The metering pump is connected to the vehicle fuel supply
using a vehicle-specific fuel tank removal kit.
Fuel tank removal kits on request.
36
30
31
32
35