Fuel System Pressure Release
Release
1.Refer to: Petrol and Petrol-Ethanol Fuel
Systems Health and Safety Precautions
(100-00 General Information, Description and
Operation).
2. Remove the fuel pump and sender unit fuse.
3. Start the engine and allow it to idle until the
engine stalls.
4. Crank the engine for approximately five seconds
to make sure that the fuel rail pressure is
released.
5. Install the fuel pump and sender unit fuse.
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310-00- 10
Fuel System - General Information
310-00- 10
GENERAL PROCEDURES
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Changing the right-hand fuel pump and level
indicator module
E113328
If the right-hand fuel pump and level indicator
module needs to be changed on a vehicle with a
booster heater/additional heater, the bore for the
connection to the fuel-fired booster
heater/additional heater must be drilled.
The right-hand fuel pump and level indicator
module contains a demand-switched electric fuel
pump which drives two suction jet pumps. One of
them ensures that fuel is pumped from the left-hand
half of the tank into the right-hand half. On-demand
switching is performed by the fuel pump module.
To remove the right-hand fuel pump and level
indicator module it is necessary to detach theleft-hand fuel pump and level indicator module and
pull it out slightly so that the connecting hose can
be detached and the connector for the left-hand
fuel pump and level indicator module can be
disconnected. The left-hand fuel pump and level
indicator module can be removed without detaching
the right-hand fuel pump and level indicator
module.
The instrument cluster uses the signals from both
fuel fill level sensors to determine the fuel fill level.
The resistor tracks of the fuel fill level sensors
cannot be replaced individually.
The fuel filter is designed to last for the service life
of the vehicle and does not need to be replaced.
The right-hand fuel pump and level indicator
module contains an overpressure limiting valve.
This overpressure limiting valve ensures that the
fuel pressure between the injectors and the
right-hand fuel pump and level indicator module
does not exceed 3.3 bar after the engine is
stopped. This reduces the formation of vapor
bubbles and also prevents dripping from the
injectors.
Fuel filler pipe and tank cap
NOTE:
Any water in the filling area can cause the
mechanism to freeze at temperatures below 0 °C.
In this case the closing mechanism will not open
when the nozzle of the petrol/diesel pump is
inserted.
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310-01- 6
Fuel Tank and Lines
310-01- 6
DESCRIPTION AND OPERATION
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Electronic Leak Detection
1.Refer to: Air Conditioning (A/C) System Health
and Safety Precautions (100-00 General
Information, Description and Operation).
2. WARNINGS:
Before starting leak detection, make
sure that the area where it is to be done
is well ventilated. If the surrounding air
is contaminated with refrigerant gas, the
leak detector will indicate this gas all
the time. Odors from other chemicals
such as antifreeze, diesel fuel, disc
brake cleaner, or other cleaning
solvents can cause the same problem.
Prevent air movement while performing
leak detection.
The refrigerant identification equipment
must be used before attaching the
manifold gauge set. Otherwise the
manifold gauge set may become
contaminated. Contaminated refrigerant
must be disposed of as special waste.
Follow the manufacturer's instructions
when working with the service unit.
NOTE: At 24°C with the engine switched off,
both manifold gauges should show 4.1 to 5.5
bar.
Attach the manifold gauge set to the service
gauge port valves.
3. For the leak test, close the manual valves on
the gauge set.
4. If little or no pressure is indicated, charge the
system with approx. 300g of refrigerant. Refer
to: Air Conditioning System - Evacuate and
Refill.
5. Use the R-134a Automatic Calibration Halogen
Leak Detector to leak test the refrigerant system.
Follow the instructions included with leak
detector for handling and operation techniques.
6. If any leak is found, extract the refrigerant under
suction. Refer to: Air Conditioning System -
Evacuate and Refill.
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412-00- 14
Climate Control System - General Information
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