103TS 500i
11.6.2 Checking the tank vent
Test preparations
– Open the filler cap and drain the
fuel tank in accordance with
regulations, b 1
– Close the filler cap
– Remove the shroud, b 6.4
– Remove the control unit, b 7.3
– Remove the air filter, b 11.1
: Pull off the fuel suction hose (1)
at the connector (arrow)
: Close the fuel suction hose (1)
with the plug (2) and push the
hose (3) of the pump (4)
0000 850 1300 onto the
support of the fuel intake
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Testing with negative pressure
: Slide ring (1) to the left and
connect the pump (2)
0000 850 1300 to the fuel tank
with negative pressure
Pressure is equalized via the tank
vent. A negative pressure must not
build up inside the tank.
– Clean the area around the tank
vent
– Replace tank vent if necessary,
b 11.6.3
– Continue with "Testing with
gauge pressure"
Testing with gauge pressure
The same preparatory steps are
required as for the testing with
negative pressure.
– Before testing with gauge
pressure – Complete testing
with negative pressure
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: Slide ring (1) to the right and
connect the pump (2)
0000 850 1300 to the fuel tank
with overpressure
Actuate the pump until the pressure
gauge shows a pressure of 0.3 bar.
If this pressure remains constant for
at least 20 seconds, the tank vent
and tank are airtight. If the pressure
drops, replace the tank vent.
– After testing, slide the ring on the
pump to the left to vent the pump
and disconnect the hose from the
support of the connecting
element.
– Replace the fuel suction hose
between the injection pump and
connecting element, b 11.7.2
– Fit air filter, b 11.1
– Reassemble remaining parts in
reverse order
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