Fuel/Water Separator; Fuel Tank; Fuel Sending Unit - Monaco 2002 Diplomat Service Manual

Chassis Information
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FUEL TANK

FUEL/WATER SEPARATOR

OM080104.eps
FUEL
SENDING UNIT
1 0 • 2 9 8
The diesel fuel tank is made of a 12 gauge aluminumized steel. The
capacity of the tank is 100 gallons. The engine pickup tube is cut at a 45°
angle to allow optimum flow to the engine.
NOTE: If the coach has been stored for any length of time
you should check the vent for blockage. It is not uncommon
for insects to plug the vent tube. If the tank appears to be
pressurized the vent tube may be blocked. To inspect the
vent tube check on the roadside of the fuel tank, near the
bottom. Always store the motorhome with a full fuel tank.
Routine Maintenance Recommendations:
1. Change the fuel filter at every oil change interval.
2. Change the fuel-water separator filter every 12-18 months or
every 25,000 miles.
The Centroid fuel sender has no moving parts. It works by measuring
capacitance, an electrical property, between its inner and outer tubes in the
tank. The more fuel between the tubes, the higher the reading. Electronics in
the hockey-puck head of the sender convert the capacitance to current to
drive the fuel gauge.
Fuel/Water separator is located in the
roadside compartment behind rear wheel. If
the WATER IN FUEL light is illuminated,
the fuel filter will need to be drained. Shut
off the engine and open the drain valve.
Turn the valve counterclockwise approxi-
mately 1½ to 2 turns until draining occurs.
Drain the fuel/water separator of water
and sediment until clear fuel is visible. Turn
the valve clockwise to close the drain
valve.
In the event the engine runs out of fuel,
the lift pump on the fuel pump will run for
approximately one minute with the ignition
ON. The ignition may have to be turned on
and off several times before attempting a
start. If unable to restart, contact the nearest
Cummins Center or phone 1-800-343-7357
for Cummins Customer Assistance Center.
D I P L O M A T