Inspect Fuel Sending Unit

Frontier: Inspect Fuel Sending Unit





1. Raise the vehicle on a hoist so you can reach the Fuel Sending Unit Connectors (see Figure 2).





2. Use the Connector Removal Tool #J-47009 to disconnect the Fuel Sending Unit Connectors (4-wire connector and 2-wire connector). See Figure 3.

NOTE:For 1999 and 2000 MY Frontier:

^ The Connector Removal Tool cannot be used on the 4-wire connector.

^ To release this connector, push forward on the Sliding Button (on top of the connector). See Figure 3.





3. Install the Connector Cover onto the Fuel Sending Unit Connectors until it is fully seated. See Figure 4.





4. Use the Nylon Brush #J-47239 to loosen/remove dirt and debris on the vertical surface of the Fuel Sending Unit Connectors (see Figure 5).

5. Remove the Connector Cover once you're done with the above step.





6. Install the Cleaning Adapter (white color adapter) onto the Fuel Sending Unit Connectors until it clicks (locks) in place. See Figure 6.

CAUTION:
When performing the following steps, use suitable protective gloves, safety glasses, or face shield.





7. Spray Brake Cleaner #999MP-AH001P through each Adapter Tube for about two seconds (see Figure 7).

^ You will need to insert the Adapter Tube into the Brake Cleaner spray can nozzle.

8. Remove and discard the Cleaning Adapter.

NOTE:
^ When you remove the Cleaning Adapter, one or both of the connector inserts may come out of the Adapter.

^ Make sure you remove the insert(s) from the Fuel Sending Unit connector(s).





9. Install the Connector Cover onto the Fuel Sending Unit Connectors until it is fully seated. See Figure 8.





10. Use shop air to thoroughly dry the vertical surface of the Fuel Sending Unit Connectors, then remove the Connector Cover. See Figure 9.

11. Inspect the Fuel Pump Connector for green corrosion.

^ Inspection is NOT required for the Fuel Level Sensor Connector.

^ Use a mirror (if needed) to look at the connector.





^ See illustrations above for examples of green corrosion.

a. If OK, go to "Frontier: Add Protective Coating To Fuel Sending Unit" below.

b. If NG, go to "Frontier: Replace Fuel Sending Unit".