Hunter H39 - Fuel Filters

Note: Even if the fuel supply valves are closed, there may be
fuel in the supply lines to the filters and engines (or generator).
Disconnecting these fittings without properly bleeding the sys-
tem of fuel could result in emptying the fuel filters and causing a
fuel spill. Only a qualified technician should ever make repairs
to your fuel system.
The fuel supply valves are the “ball type” valves. Turning
the handle so it is perpendicular to the valve body shuts
off the supply or return. Turning the handle so it is in line
with the valve body opens the valve, as shown in Fig.
5.5.
Example of Fuel Supply Valves
O
P
E
N
O
P
E
N
S
H
U
T
S
H
U
T
OPEN
SHUT
OPEN
SHUT
Open Shut
Fuel Valve Illustration
A quick view of the
difference in an open
and shut fuel valve
5.4 Filters (Fuel Water Separators)
The fuel supplied to the engines or the generator (if so
equipped) may contact impurities found in the fuel tanks
or in the fuel from your supplier. If these impurities are
not removed prior to starting the engine or generator, per-
formance may be seriously affected. Removal of the fuel
impurities is accomplished by external fuel filters.
5.4.1 Main Engine Filters
Each engine/generator has a separate filter located
away from the engine. Check the Fuel Arrangement
illustration at the end of this chapter for the exact loca-
tion of these filters.
An authorized service technician should replace all filters
annually prior to spring launch. They may need more
frequent replacement if you notice poor engine/generator
performance due to contaminated fuel.
On the following page, Fig. 5.7, pg. 5.7, you will find an
illustration for the Racor Fuel Water separator (commonly
referred to as the fuel filter). This will break down the
components of the filter and their uses within the filter.
5.4.2 Generator Fuel Filter
Check your fuel system arrangement at the end of this
chapter for the location of the Generator Filter (tagged).
This is a fuel – water separator type filter.
5.4.3 Servicing Filters:
Make sure the engine is off.
Close shut-off valve between fuel tank and filter if
applicable.
Remove drain plug and operate pump to drain off
contaminants.
Note: Do not leave drain open for very long as it will
empty filter of all fuel.
When fuel is detected coming out of drain, close
drain.
Open shut off valve. Follow priming instructions.
Consult your owner’s packet for more information con-
cerning this filter or for replacement parts.
1.
2.
3.
4.
5.
Fig. 5.5
Main engine fuel filter
Fig. 5.6
Fuel Systems
5.5