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Fuel pressure
Fuel Feed Pressure, Check
Tools:
9998494 Hose
9996066 Nipple
9998339 Manometer
Pressure is measured after fuel has passed the filter
insert. When checking, first increase engine revolu-
tions then reduce them so that the pressure is read at
low idle.
NOTICE!
The overflow valve may not be adjusted.
Replace the valve if necessary.
1
Connect 9998494 Hose and 9998339 Manome-
ter with 9996066 Nipple to the venting outlet on
the filter cover.
2
Feed pressure may not be below
300 kPa
.
Low feed pressure can be the result of a blocked fuel
filter, a defective overflow valve or a defective feed
pump. Make sure the components fulfill recommenda-
tions and do not cause excessive pressure.
Fuel pre-filter
The filter must be installed on the feed pump suction
side, between the feed pump and the fuel tank. It must
be placed vertically between the fuel tank bottom and
the feed pump in order to reduce resistance in the feed
line.
Install the filter vertically on a bulkhead or bracket
where it is not affected by engine revolutions and such
that it is as protected as possible from an engine com-
partment fire. The location must also facilitate inspec-
tions and filter insert changes.
Select fuel filters with a capacity suitable for engine fuel
flow.
NOTICE!
Depending on filter type, free space above
the filter of 130–260 mm (5–10") is required for filter
insert changes.
NOTICE!
Fuel pre-filters with glass bowls may not be
installed in boats that are to be CE marked.
Double filters
The double fuel pre-filter has a pressure gauge that
shows pressure-drop. Flow may be directed through
the left, right or both filters, which makes filter insert
replacement possible when the engine is running.
Installation, Fuel System
118
47704162 10-2014 © AB VOLVO PENTA
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