Volvo Penta D25A MS Operator's Manual page 53

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Close the fuel cocks on the tank or cut off the flow of
fuel with the knob (1) for the filter insert to change if
running.
WARNING! Working on or approaching a
running engine is a safety hazard. Beware of
rotating parts and hot surfaces.
1. Place a receptacle under the filter.
2. Undo the T-bolt (2) and remove the cover (3).
3. Take out the insert carefully while turning it.
4. Drain off water and contaminants through the
drain plug (4).
5. Fit a new filter insert and fill the container with cle-
an fuel.
IMPORTANT! Cleanliness! No contaminants
must be allowed in the fuel system.
6. Change the gasket on the cover and the O-ring
on the T-bolt. Moisten the gasket and O-ring with
fuel before assembling.
7. Fit the cover and tighten it by hand.
8. Wipe off any fuel from the heat shield.
9. Dual filter: Change the other filter insert in the
same way.
10. Open the fuel cocks and put the knob (1) in posi-
tion for normal running. Make sure there are no
leaks.
Maintenance: Fuel System
53