Chassis Information --- Section 10
Cayman 2005
367
Fuel Sender
The "Centroid" fuel sender has no moving parts and works by measuring capacitance (electrical prop-
erty) 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:
1 & 2 - Positive (POS) and Negative (NEG): Battery voltage to run the electronics in the
sender head.
3 - SEND: Connects to the SEND terminal of the gauge on the dash.
4 - ALARM: Makes a connection internally to the negative (NEG) 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 and is not adjustable.
Adjustments:
The "Centroid" sender has two adjustments:
1 - EMPTY: Adjusts for length of sender. It has been set at the factory, covered with a sealant
and should not be changed.
2 - Full Adjustment (FULL): The full adjustment can be used to correct for slight differ-
ences between fuel meters. During installation, it has been factory calibrated and should not
need re-adjustment.
Fuel Sending Unit.
090318
Full
Adjust
RED:
To Gauge
YELLOW:
Ignition
WHITE:
Ground
BLUE:
Low Fuel
Indicator
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