Fuel Pump Relay

This procedure locates and replaces the fuel pump relay in a 2008 Dodge Viper, which controls power to the fuel pump and is critical for engine starting and operation.

Warnings

Tools required

Parts

• Fuel pump relay × 1 — Use OEM specification or verify amperage rating matches original

Preparation

1. Park vehicle on level surface and engage parking brake.
2. Turn ignition to OFF position and remove key.
3. Allow engine to cool if recently operated (relay box can retain heat).
4. Open driver's door to enable access to interior relay/fuse panel.
5. Gather replacement relay and verify it matches original part number or specifications before beginning work.

Procedure

1. 1

   Locate the power distribution center
   The 2008 Viper's fuel system is controlled through the underhood Power Distribution Center (PDC) / Totally Integrated Power Module area. Open the hood and secure it. Locate the PDC per the factory service manual, as the exact position on the 2008 Viper (ZB II) must be verified rather than assumed. Note: confirm whether this vehicle uses a discrete plug-in fuel pump relay or a fuel pump control module before proceeding.
2. 2

   Remove power distribution center cover
   Press the release tabs on the sides of the PDC cover and lift straight up to remove. The cover interior should have a diagram showing relay positions. Set cover aside in clean location where diagram remains visible.
3. 3

   Identify the fuel pump relay
   Using the diagram on the PDC cover, locate the fuel pump relay position. The relay is typically labeled 'FUEL PUMP' or 'FP' on the diagram. Verify the fuel pump relay configuration against the factory service manual, as the 2008 Viper may use an integrated PDC relay or a fuel pump control module rather than a standard 4- or 5-pin plug-in relay. Note the relay's orientation and any markings on the top before removal.
4. 4

   Remove the old fuel pump relay
   Grasp the fuel pump relay firmly and pull straight up with steady pressure to extract it from the socket. If relay is difficult to remove, use needle-nose pliers to grip the sides (not the top) and pull straight up. Avoid rocking or twisting which can damage socket pins. Inspect the removed relay for signs of burning, melted plastic, or corrosion on the pins.
5. 5

   Inspect relay socket
   Examine the relay socket in the PDC for any signs of corrosion, burning, or damaged pins. If socket pins are discolored, melted, or corroded, the PDC may require service or replacement. Use flashlight to inspect pin condition inside socket. Clean any minor corrosion with electrical contact cleaner if present.
6. 6

   Verify replacement relay specifications
   Compare the new relay to the old relay. Verify that pin count, physical dimensions, and amperage rating match exactly. Check that any part numbers or electrical specifications printed on the relay body are identical or confirmed as superseding equivalents. Do not proceed if relay specifications do not match.
7. 7

   Install new fuel pump relay
   Align the new relay with the socket, ensuring the pin configuration matches the socket layout and the relay orientation matches the original installation. Press the relay firmly into the socket until it seats completely and sits flush with surrounding relays. The relay should click or snap into place when fully seated. Verify all pins are engaged by gently attempting to lift relay - it should not move.
8. 8

   Reinstall power distribution center cover
   Position the PDC cover over the relay/fuse box, aligning it with the mounting features. Press down firmly until the cover tabs click into place and the cover sits flush with the box. Ensure cover is fully secured to prevent water or debris entry.

Reassembly

1. Close hood and ensure it latches securely.
2. No additional reassembly required for this procedure.

Verification

• Turn ignition to ON position (do not start engine yet). Listen for fuel pump priming sound (a brief 2-3 second hum from rear of vehicle). This confirms relay is providing power to pump.
• Start engine and verify it starts normally without extended cranking. Engine should start within normal cranking time (1-3 seconds).
• Allow engine to idle for 30 seconds and verify smooth operation with no hesitation or fuel starvation symptoms.
• Turn engine off, wait 10 seconds, and restart to verify consistent operation through multiple start cycles.
• If equipped with scan tool, verify no fuel system fault codes are present after relay replacement.
• If engine fails to start or fuel pump does not prime, turn ignition OFF immediately and recheck relay installation, pin engagement, and relay specifications.

Related trouble codes on this vehicle

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