Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Fuel Level Sensor: Description
This input is required as part of the misfire detection system in order to record if a LOW FUEL situation was present when misfire was detected and logged as a fault. On Range Rover 38A the ECM is required to read an analogue fuel level input and determine the LOW FUEL condition from this signal. Discovery Series II had an active high digital input until 2000MY, at which point this input also became an analogue signal. For fuel level sensor testing, see Fig 1 .
There are three fuel level input diagnostic checks, during which a fault is detected if:
- The input signal is less than a minimum voltage threshold.
- The input signal is greater than a maximum voltage threshold.
- The percentage difference between the fuel consumption calculated by the ECM and the change in the fuel tank level is greater than a threshold.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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