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Chassis Information
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I M P E R I A L
1 0 • 2 7 9
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.
Fuel/Water separator is located in rear engine compart-
ment on left and right of frame. If “water in fuel” light is
illuminated, fuel filter will need to be drained. Shut off
engine and open drain valve. Turn valve counterclockwise
approximately 1-1/2 to 2 turns until draining occurs. Drain
fuel/water separator of water and sediment until clear fuel
is visible. Turn valve clockwise to close drain valve.
In the event the ISC engine runs out of fuel, the lift
pump on the fuel pump will run for approximately 1 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-DIESELS for Cummins Customer Assistance Center.
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.
Connections:
The Centroid sender has four connections:
• Positive and Negative: Battery voltage to run the
electronics in the sender head.
• Send: Connects to the Send terminal of the gauge
on the dash.
• Alarm: Makes a connection internally to the Negative
terminal when the low alarm fuel level is reached
(when gauge is reading about 1/8 tank). This turns on
the alarm light on the dash. It is not adjustable.
Adjustments:
The Centroid sender has two adjustments:
Empty
: Adjusts for length of sender. It has been set at the factory and
covered with a sealant. It should not be changed.
Full Adjustment
: The full adjustment can be used to correct for slight
differences between fuel meters. During installation it has been calibrated for
your meter and should not need readjustment.
FUEL/WATER SEPARATOR
(ISC Engine)
FUEL SENDING
UNIT
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