Fuel Pump Relay

This procedure locates and replaces the fuel pump relay in the Power Distribution Center (PDC) under the hood of a 2005 Dodge Viper, restoring proper fuel pump operation.

Warnings

Tools required

Parts

• Fuel pump relay × 1 — Mopar 04692190AB or equivalent

Preparation

1. Park vehicle on level surface and engage parking brake
2. Turn ignition to OFF position and remove key
3. Allow engine compartment to cool if vehicle was recently operated
4. Open hood and secure with prop rod
5. Locate Power Distribution Center (PDC) on driver side of engine compartment near firewall

Procedure

1. 1

   Disconnect battery negative terminal
   Using a 10mm wrench, loosen the battery negative terminal clamp bolt and remove the cable from the battery post. Position cable away from battery to prevent accidental reconnection. Battery is located in rear trunk compartment on 2005 Viper. Access battery through trunk interior panel on driver side.
   ⚠️Failure to disconnect battery can result in electrical short, airbag deployment, or component damage during relay service.
2. 2

   Open Power Distribution Center cover
   Locate the PDC black plastic enclosure on the driver side inner fender near the firewall. Release the cover by pressing the retaining tabs on both sides and lifting upward. The cover has an integrated relay/fuse diagram on the underside showing component locations.
   ℹ️Do not force cover tabs. If tabs are difficult to release, verify all locking points are being pressed simultaneously.
3. 3

   Identify fuel pump relay location
   Using the relay diagram on the PDC cover or in the owner's manual, locate the fuel pump relay. On the 2005 Viper, the fuel pump relay is a standard mini ISO relay (4-pin or 5-pin configuration); its exact cavity position must be confirmed using the diagram printed on the PDC cover underside before removal. The cavity will be identified via the legend/diagram on the PDC cover underside, which maps each numbered cavity to its function. Verify by cross-referencing the relay diagram before removal.
   ⚠Removing the wrong relay can affect other vehicle systems. Always verify relay position against diagram before proceeding.
4. 4

   Remove failed fuel pump relay
   Grasp the fuel pump relay firmly and pull straight upward with steady pressure to extract from socket. If relay is difficult to remove, use needle-nose pliers or a relay removal tool to grip the relay body (not the terminals) and pull upward. Inspect the relay socket terminals for corrosion, heat damage, or bent pins. Clean socket with electrical contact cleaner if corrosion is present.
   ⚠Do not rock or twist relay excessively during removal as this can damage socket terminals.
5. 5

   Inspect old relay and verify failure
   Examine the removed relay for visible signs of failure including burned or melted plastic, corroded terminals, or rattling internal components (indicates broken contacts). If relay appears intact, the issue may be elsewhere in the fuel system. Consider professional diagnosis if relay shows no obvious failure signs.
   ℹ️Many fuel delivery issues are misdiagnosed as relay failure. Common alternate causes include failed fuel pump, clogged fuel filter, or wiring harness damage.
6. 6

   Install new fuel pump relay
   Verify the new relay matches the original in pin configuration and amperage rating (typically 30A or 40A for fuel pump application). Align relay pins with socket terminals and press firmly straight downward until relay seats completely flush with the PDC housing. Relay should click into place and sit at same height as adjacent relays.
   ⚠️Installing incorrect relay amperage rating can cause fire or fuel pump damage. Verify relay specifications match OEM requirements.
7. 7

   Reinstall PDC cover
   Position the PDC cover over the relay/fuse box, aligning all edges. Press down firmly on both sides until retaining tabs click into locked position. Verify cover is fully seated and cannot be lifted without pressing release tabs.
8. 8

   Reconnect battery negative terminal
   Return to rear trunk battery location. Clean battery post and cable terminal if corrosion is present. Place negative cable onto battery post and tighten clamp bolt to secure connection. Torque to specification if torque wrench is available.
9. 9

   Prime fuel system and verify operation
   Turn ignition key to RUN position (without starting engine) and listen for fuel pump priming sound from rear of vehicle (should run for approximately 2 seconds). Cycle ignition OFF then back to RUN two more times to pressurize fuel system. If fuel pump is audible during priming, relay replacement was successful. Start engine and verify normal operation.
   ⚠If fuel pump does not prime or engine does not start, recheck relay installation and verify correct relay position. Do not continue cranking engine excessively.

Reassembly

1. Ensure PDC cover is fully latched with all tabs engaged
2. Verify battery connection is tight and corrosion-free
3. Close hood and verify all tools are removed from engine compartment

Verification

• Turn ignition to RUN position and confirm fuel pump primes for approximately 2 seconds (audible hum from rear of vehicle)
• Start engine and verify it runs normally without hesitation or stalling
• Check for any new warning lights on instrument cluster
• Test drive vehicle briefly to confirm normal fuel delivery under acceleration
• If fuel pump still does not operate, further diagnosis of fuel pump, wiring harness, or PCM may be required

Related trouble codes on this vehicle

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