8.8.5 Fuel prefilter (switchable) – Low pressure indicator check
Low pressure indicator on
switchable fuel prefilter
1.
Check low pressure indicator reading at low
pressure gauge (3):
• Red zone (1): -1.0 bar to -0.4 bar (low
pressure)
• Green zone (2): -0.4 bar to +0.5 bar (nor-
mal operation)
2.
Switch over the fuel prefilter or replace a fil-
ter element (→ Page 223) when the low pres-
sure gauge (3) indicates minimum admissible
fuel pressure during operation (1) .
220 | Fuel Filter | MS15039/01E 2018-11
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