Fault Phenomenon: BelAZ 75710 mining truck instrument displays inaccurate fuel level, always showing full or empty.

Troubleshooting Process:
– Checked float: float rod bent or float damaged and filled with oil.
– Checked guide tube: guide tube deformed, trapping the float.
– Checked resistance: sensor resistance does not change with fuel level.
– Checked oil quality: sludge adhering to float.

Root Cause: The fuel tank level sensor float is stuck due to sludge adhesion or guide tube deformation, unable to move with the fuel level.

Required Parts: Clean or replace fuel tank level sensor assembly.