Replace the EVAP vent valve (also called the Leak Detection Pump or LDP assembly) which controls purge vapor flow from the fuel tank to prevent evaporative emissions.

Warnings

Tools required

Parts

• EVAP Vent Valve (Leak Detection Pump) × 1 — Use OEM specification
• Mounting bracket bolt (if damaged) × 1 — Use OEM specification

Preparation

1. Park vehicle on level ground and apply parking brake
2. Chock the front wheels securely
3. Disconnect negative battery terminal and wait 2 minutes for systems to power down
4. Allow fuel system to cool if vehicle was recently driven
5. Raise rear of vehicle using jack and secure on jack stands rated for vehicle weight
6. Remove left rear wheel for improved access on 4WD models

Procedure

1. 1

   Locate EVAP Vent Valve Assembly
   The EVAP vent valve (LDP assembly) is mounted on the driver side frame rail ahead of the rear axle, near the fuel tank. It is a small black plastic canister with electrical connector and vapor lines attached. Use a shop light to identify the component and access route.
2. 2

   Disconnect Electrical Connector
   Locate the electrical connector on the EVAP vent valve. Press the red locking tab and pull the connector straight away from the valve. Do not pull on the wiring harness itself. If connector is corroded or stuck, gently wiggle while pulling.
3. 3

   Disconnect Vapor Lines
   Identify the two vapor lines connected to the EVAP vent valve: one from the charcoal canister and one vent line. Press the quick-connect release tabs on each line fitting and pull straight off the valve ports. You may hear a brief hissing sound as system pressure equalizes. Note the orientation of each line for reassembly.
4. 4

   Remove Mounting Bracket Bolts
   Using a 10mm socket, remove the two mounting bracket bolts securing the EVAP vent valve assembly to the frame rail. Support the valve with one hand while removing the second bolt to prevent it from falling.
   Torque spec

   Bracket Bolts27 Nm (20 lb-ft)
5. 5

   Remove EVAP Vent Valve
   Carefully lower the EVAP vent valve assembly away from the mounting bracket. Inspect the mounting bracket for damage or corrosion. Check the vapor line ports on the valve for cracks or debris.
6. 6

   Inspect Vapor Lines and Mounting Area
   Examine both vapor line quick-connect fittings for damage, cracks, or debris. Check that the rubber seals inside the quick-connects are intact and pliable. Inspect the frame rail mounting surface and clean any dirt or corrosion with a wire brush. Verify the mounting bracket is not bent or damaged.
7. 7

   Install New EVAP Vent Valve
   Position the new EVAP vent valve into the mounting bracket on the frame rail, aligning the mounting holes. Ensure the electrical connector and vapor ports face the correct direction for line routing. Hand-thread both mounting bracket bolts before tightening.
8. 8

   Torque Mounting Bracket Bolts
   Using a torque wrench with 10mm socket, tighten the mounting bracket bolts in a cross pattern to ensure even seating. Torque to specification and verify the valve is secure with no movement.
   Torque spec

   Bracket Bolts27 Nm (20 lb-ft)
9. 9

   Reconnect Vapor Lines
   Push each vapor line quick-connect fitting straight onto the corresponding port on the new EVAP vent valve until you hear and feel a distinct click. Tug gently on each line to confirm it is fully seated and locked. Verify the line from the charcoal canister and the vent line are connected to the correct ports as noted during removal.
10. 10

    Reconnect Electrical Connector
    Align the electrical connector with the EVAP vent valve and push straight on until the red locking tab clicks into place. Tug gently on the connector to verify it is secure. Route the wiring harness away from any sharp edges or heat sources.
11. 11

    Reinstall Wheel and Lower Vehicle
    If the left rear wheel was removed, reinstall it and torque lug nuts to specification in a star pattern. Carefully raise the vehicle to remove jack stands, then lower completely. Torque lug nuts again once vehicle weight is on the wheels.
12. 12

    Reconnect Battery and Clear Codes
    Reconnect the negative battery terminal and tighten securely. If a check engine light was present, use an OBD-II scan tool to clear stored EVAP system codes (typically P0441, P0455, or P0456). The system may need to complete a drive cycle before the monitor sets to 'ready' status.

Reassembly

1. Ensure all vapor line quick-connects are fully seated and locked
2. Verify electrical connector is secure with locking tab engaged
3. Double-check mounting bracket bolts are torqued to specification
4. Confirm no vapor lines are kinked, pinched, or rubbing against sharp edges

Verification

• Start the engine and verify no check engine light appears immediately
• Listen for any hissing sounds near the EVAP vent valve that would indicate a vapor leak
• Use a scan tool to perform an EVAP system test or leak test if available
• Monitor for EVAP-related trouble codes over the next 50-100 miles of driving
• Verify the EVAP monitor completes its drive cycle and shows 'ready' status on scan tool
• Inspect the installation area for any fuel vapor odor after a test drive

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