English – 43
Repair instructions
7.18 Aerating the fuel tank
The two-way valve has the following properties:
• Checks opening pressure in both directions,
which prevents a positive pressure or a
vacuum developing in the fuel tank and
impairing engine performance. This also
prevents fuel leakage.
• Opening pressure outwards:
4.9 – 29.4 kPa (0.05 – 0.3 bar).
• Opening pressure inwards (vacuum):
Max. 3.9 kPa (0.04 bar).
Remove the cover using a at screwdriwer. Re-
move the foam cover. Remove the tank venting
valve using a plier. See Figure 54a.
Test
Opening pressure outwards:
1. Open the fuel cap and leave it open during the
entire test. Empty the tank of fuel.
2. Connect the 531 03 06-23 pressure gauge
(see Figure 54b) to the tank valve.
3. Switch the pressure gauge to vacuum mode.
4. After pumping, the indicator must be between
4.9 - 29.4 kPa.
Opening pressure inwards:
1. Open the fuel cap and leave it open during the
entire test. Empty the tank of fuel.
2. Connect the 531 03 06-23 pressure gauge
(see Figure 54b) to the tank valve.
3. Switch the pressure gauge to pressure mode.
4. After pumping, the indicator must stop at
max. 3.9 kPa.
Fig 54a
Fig 54b
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