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1.5
Safety precautions when working on
fuel supply system
Caution
When doing any repair work, especially in the engine compart‐
ment, pay attention to the following due to the cramped condi‐
tions:
♦ Route all the various lines (e.g. for fuel, hydraulics, acti‐
vated charcoal filter system, coolant, refrigerant, brake
fluid and vacuum) and electrical wiring in their original po‐
sitions.
♦ Ensure that there is sufficient clearance to all moving or
hot components.
♦ Fuel supply lines are under pressure! Before loosening
hose connections and separating points, wrap a cloth
around the connection. Then release pressure by carefully
opening the fuel line.
♦ For safety reasons, fuel pump relays -1- (right) and -2- (left)
have to be removed from the fuse box before the fuel system
is opened because the fuel pump can be activated when the
driver door is opened.
When removing and installing fuel gauge sender or fuel pump
(fuel delivery unit) from a full or partly full fuel tank, observe the
following:
♦ Before beginning work, place an extraction hose close to
sender opening in fuel tank to extract escaping fuel fumes and
switch on exhaust extraction system. If no exhaust gas ex‐
traction system is available, a radial fan with a displacement
greater than 15 m
3
/h can be used providing that motor is not
in air flow.
♦ Prevent skin contact with fuel! Wear fuel-resistant gloves!
1.6
Rules for cleanliness
When working on the fuel supply and injection system, observe
the following “5 rules” for cleanliness:
♦ Thoroughly clean all unions and surrounding areas before dis‐
connecting.
♦ Place removed parts on a clean surface and cover. Use only
lint-free cloths.
♦ Carefully cover opened components or seal if repairs cannot
be carried out immediately.
♦ Install clean components only. Do not remove replacement
parts from packing until immediately before installing. Do not
use parts that have not been stored in their packing (e.g. in
tool boxes etc.).
♦ When system is open: do not work with compressed air if this
can be avoided. Do not move vehicle unless absolutely nec‐
essary.
1.7
Emptying fuel tank
Special tools and workshop equipment required
Phaeton 2003 ➤
6-cylinder injection engine - Edition 02.2014
128
Rep. gr.20 - Fuel supply system