MJM Yachts 40z Express - Manual (Page 25)

CHAPTER 5
5.3
Racor Filters are your first line of defense against bad fuel and
are installed just after the shut-off valves in the fuel lines, inside
the Systems Room, on either side bulkhead just forward of the
generator. Check these filters regularly for any accumulation of
water or contamination. Water will appear as a dirty gray, cloudy
substance in the clear bowl. You should be able to see thru the
pink fuel in the bowl at all times. Also, you should not see
bubbles passing through the filter while running. This would
indicate a leak on the suction side of the fuel system.
RACOR FUEL FILTERS Starboard and Port
in Systems Room under the Pilothouse
FILTER ACCESS LID – Be sure to close fuel
shut-off valve before opening. Be careful to
seal properly without pinching gasket.
FUEL LINES from tank and to engine
CLEAR GLASS INSPECTION BOWL
WATER DRAIN PETCOCK – If water seen
in bowl, hold a paper cup under the petcock
and drain until clear fuel seen.
5.4 FUEL CONSUMPTION
You can learn several things from the chart below prepared from 3 separate runs in Jan-Feb
2009 in Boston Harbor, near Captiva Fl, and during the Miami Boatshow. Volvo-Penta technicians
conducted two of the runs.
Displacement (Boat Weight) Assuming similar hull designs, fuel efficiency is a function power:
weight ratios. Less weight equals less fuel for a given HP and we’re sure to see a difference
between IPS pod drives and sterndrives. Test runs were done on 40z #1 powered with an IPS
500 propulsion system consisting of twin D6 370 HP diesel engines. Each run was at
approximately 21,000 lbs. displacement. Dry and empty scale weight of the boat was 16,000 lbs.
The 21,000 lbs. included at least " full tankage and approximately 1400 lbs. of cruising gear and
2-4 people.
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RACOR PRIMARY FUEL FILTERS
FUEL SYSTEM