The Centeroid fuel sender has no moving parts. It works by measuring capaci-
tance, 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 sealant. It should not be changed.
Full Adjustment: The full adjustment can be used to correct for slight differ-
ences between fuel meters. During installation it has been calibrated for your meter
and should not need re-adjustment.
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 counterclockwise until the full mark is reached. The intent is to
always adjust downscale rather than upscale.
Troubleshooting:
A. Electornic output. The sender has a transistorized output. This prevents
an ohmmeter from getting a correct reading of its output resistance.
B. Fuel Only: The sender will not work correctly in conducting fluids
such as water (it will read above full all the time in water). One
possibility, when you have a constant above-full reading, is that you
have water at the bottom of the fuel tank.
C. Contact Centroid: Probably 90% of the return Centroid tests work okay on
the bench. If you have incorrect readings contact Centroid (telephone:
800-423-3574, or preferable fax: 904-423-3709) with your symptoms.
You will be provided with a short “Fill in the blanks” troubleshooting
test appropriate to your sender. It is easier to find the problem that way
than after the sender has been removed from the system, since the problem
is not necessarily with the sender.
Chassis Information
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WINDSOR
10•294
FUEL SENDING
UNIT
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