This procedure covers the location, removal, and replacement of the fuel pump relay in the Power Distribution Center (PDC) of a 2014 Ram 2500 with 6.7L Cummins diesel engine.

Warnings

Tools required

Parts

• Fuel pump relay × 1 — Mopar 68089210AA or equivalent 40A micro relay

Preparation

1. Park vehicle on level surface and engage parking brake
2. Turn ignition to OFF position and remove key
3. Open hood and secure with prop rod
4. Disconnect negative battery terminal and isolate cable away from battery post (wait 2 minutes for system capacitor discharge)
5. Locate the Power Distribution Center (PDC) on the driver side of engine compartment, mounted to inner fender well near battery
6. Note: The fuel pump relay is typically labeled on the PDC cover diagram as 'Fuel Pump' or with relay designation

Procedure

1. 1

   Remove PDC cover
   Release the locking tabs on the sides of the Power Distribution Center cover by pressing inward and lifting upward. Remove the cover completely to expose relays and fuses. Inspect the underside of cover for the relay location diagram and identify the fuel pump relay position (typically position M08 or similar).
2. 2

   Identify fuel pump relay
   Locate the fuel pump relay using the diagram on the PDC cover. The fuel pump relay is a standard automotive micro relay (40A rating) and is typically located in the center or upper section of the relay block. Verify identification by checking the relay label on the PDC housing or referring to owner's manual relay diagram.
3. 3

   Inspect relay socket condition
   Before removing the relay, visually inspect the relay socket for signs of heat damage, melting, corrosion, or discoloration. If socket shows heat damage or melted terminals, the socket assembly may need replacement and professional diagnosis is recommended to determine cause of overheating.
   ⚠A damaged or corroded relay socket indicates an underlying electrical problem. Simply replacing the relay may not solve the issue and could lead to repeat failures.
4. 4

   Remove old fuel pump relay
   Grasp the relay firmly and pull straight upward with steady pressure to remove it from the socket. If relay is difficult to remove, use needle nose pliers or a relay puller tool, gripping the relay body (not the terminals). Rock gently side-to-side while pulling upward if needed. Do not bend or twist excessively.
5. 5

   Inspect and clean relay socket terminals
   With relay removed, inspect the socket terminals for corrosion, dirt, or damage. Terminals should be bright and free of green/white corrosion. If minor corrosion is present, spray electrical contact cleaner into the socket and allow to air dry completely (2-3 minutes). If terminals are severely corroded or damaged, socket replacement is required.
6. 6

   Verify new relay specifications
   Before installation, verify the new relay matches the original specifications: 40 ampere rating, 12-volt coil, micro relay form factor. Check that terminal configuration matches (compare terminal layout to old relay). Installing incorrect relay type can cause fuel system malfunction or electrical damage.
   ⚠️Using a relay with incorrect amperage rating can cause fuel pump failure or electrical fire. Verify 40A rating before installation.
7. 7

   Install new fuel pump relay
   Align the new relay terminals with the socket openings, ensuring correct orientation (relay will only fit one way due to keyed terminal arrangement). Press the relay firmly and evenly into the socket until it seats completely flush with surrounding relays. Relay should click or snap into place and sit level with no gaps.
8. 8

   Reinstall PDC cover
   Position the Power Distribution Center cover over the relay/fuse block, aligning the cover tabs with the housing slots. Press down firmly around the perimeter until all locking tabs click into place. Ensure cover is fully seated and secure with no gaps.
9. 9

   Reconnect battery
   Reconnect the negative battery cable to the negative battery terminal. Tighten the terminal clamp securely but do not overtighten (hand tight plus 1/4 turn with wrench is typically sufficient).

Reassembly

1. Verify PDC cover is fully latched and secure
2. Reset clock and radio presets as needed
3. Clear any diagnostic trouble codes if check engine light appears (normal after battery disconnect)

Verification

• Turn ignition key to RUN position (do not start engine) and listen for fuel pump priming - you should hear a 2-3 second hum from fuel tank area as pump pressurizes system
• If fuel pump does not prime with key on, recheck relay installation and verify relay is fully seated
• Start engine and verify normal operation with no fuel delivery issues or warning lights
• Allow engine to idle for 2-3 minutes and verify stable operation
• If problems persist after relay replacement, further electrical diagnosis is required as issue may be wiring, fuel pump motor, or PDC socket related

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