'93-97 F-series Diesel Low-Pressure Fuel & Gauge
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Level sender empty ~16 Ohms; full ~160 Ohms
A fuel gauge pegged high means open circuit (broken wire, corroded level sender, dirty switch or connector contacts).
A fuel gauge pegged low suggests a sunk float or short to ground, either on the Y/Wh wires, or on the selected tank's sender wire.

See also:
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Owner caption May 2020 · Photo 80 of 196