P0461

P0461-FUEL LEVEL UNIT NO CHANGE OVER TIME

P0461 - Fuel Level Unit No Change Over Time:

WHEN MONITORED
While the engine is running.

SET CONDITION
Fuel level does not change by a calibrated amount over a calibrated
amount of time.

POSSIBLE CAUSES
- External damage to fuel tank
- Fuel level sensor
- Inside of fuel tank obstructed damaged
- Intermittent condition

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.

Diagnostic Test

1. EXTERNAL DAMAGE TO FUEL TANK
Visually inspect the fuel tank for external damage.

Q: Is the fuel tank damaged from the outside?

YES: Fix or replace the fuel tank. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1
NO: Go To 2

2. FUEL LEVEL SENSOR
Disconnect the wiring harness from the fuel level sensor.

NOTE: Check connectors - Clean/repair as necessary.

Remove the fuel level sensor from the fuel tank.

Q: Does the fuel level float move freely?

YES: Go To 3
NO: Replace the fuel level sensor. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1

3. FUEL LEVEL SENSOR
Measure the resistance between the sensor (N4) signal circuit and (K900) return circuit while moving the sensor float arm.

Q: Does the resistance level change as you move the sensor arm?

YES: Go To 4
NO: Replace the fuel level sensor. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1

4. INSIDE OF FUEL TANK OBSTRUCTED DAMAGED
Visually inspect the inside of the fuel tank for obstructions.

Q: Is the inside of the fuel tank damaged or obstructing the fuel level sensor?

YES: Test Complete.
NO: Replace the fuel tank. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1