MJM Yachts 36z Express User Manual
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5.2
5.3
FUEL SYSTEM
FILLING THE TANKS
Deck fills are mounted on the side decks, port & starboard, and are labeled “DIESEL.” Each one
services only its respective tank, although with the connecting fuel line valve open, you will get
some transfer to the opposite tank. As the tank is filled, vapor escapes the tank thru the vent.
Overflow is prevented by an in-line fuel/air separator that will not allow fuel to pass.
should be taken while filling. Check the fuel level gauges and listen for the rise
in pitch at the deck fill, as fuel reaches the top. Shut off the nozzle immediately. Do not attempt to
“top off” the tanks. Have an absorbent cloth handy to prevent any overboard spillage. Variations
in temperature as well as trim angle could cause overflow or vent-line blockage.
RACOR PRIMARY FUEL FILTERS
Racor Filters are your first line of defense against
bad fuel and are installed on the bulkhead just
forward of the engines and accessed by opening
the aft seat engine hatch. 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.
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.
The chart below is prepared from the first seatrial in Boston Harbor, September 2010. Fuel
efficiency is expected to improve marginally as the engine breaks in.
Range of Efficient Operation It’s interesting to note that it doesn’t matter whether you are going
11 knots or 30 knots on a 36z, nautical miles per gallon remain fairly constant.
Cruising Speed Yanmar suggest that given suitable conditions, 10% below wide open
throttle, or about 3600 RPM at close to knots is an acceptable cruising speed.
CHAPTER 5
5.4
FUEL CONSUMPTION
23