Fuel Sending Unit - Holiday Navigator 2003 Owner's Manual

The bottom of the tank is made in a V configuration allowing the engine
pick-up tube access to almost all available fuel in the tank. Internal baffles
slow fuel slosh. A check valve placed at the bottom of the baffle, at the end of
the tank with the pick-up tubes, prevents fuel starvation through long corners
when fuel supply is low.
NOTE: Fill the fuel tank if the motorhome is going to be
stored for any length of time. This will reduce the amount of
condensation that can form. After storage check the vent tube
for blockage. It is not uncommon for insects to plug the vent
tube. If pressure or vacuum exists when the fuel cap is
removed, the vent tube may be blocked. The end of the vent
tube is located on the curbside of the fuel tank, near the bottom.
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 fuel alarm level is reached (when the fuel gauge is
reading about 1/8 tank). This turns on the fuel indicator 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.
The correct adjustment technique, with a full tank of fuel, is to
start with the full adjustment screw completely clockwise. This
should cause the reading to be above full. Adjust slowly, rotate
counterclockwise, until the full mark on the gauge is reached.The
intent is to always adjust downscale rather than upscale.
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Chassis Information
Sending Unit

Fuel Sending Unit.

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Fuel
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