The fuel pump relay is located inside the engine‑compartment Power Distribution Center (PDC), a black plastic box that houses fuses and relays. The lid of the PDC has a diagram or labels marking the Fuel Pump relay position.
Where to find the fuel pump relay
In the 2011 Grand Cherokee, look under the hood for the Power Distribution Center (PDC), the main relay/fuse box in the engine compartment. The Fuel Pump relay is one of the relays seated inside this box, and the lid’s diagram will identify its exact position.
- Location: engine‑bay Power Distribution Center (PDC), a black plastic box that contains most of the vehicle’s fuses and relays.
- Identification: Open the PDC lid and read the diagram or labeling on the inside; the relay labeled “FUEL PUMP” corresponds to the fuel pump circuit.
- Access: With ignition off, release the PDC cover and lift it to access the relays. Handle carefully and reseat securely when finished.
Concluding: For model‑accurate identification, rely on the PDC cover diagram or the service manual’s relay map. If the lid isn’t clear, refer to the vehicle’s fuse/relay guide for confirmation.
How to test the fuel pump relay
If you suspect a faulty relay, you can perform a few basic checks before replacing components. These tests help determine whether the issue lies with the relay, the control circuit, or the pump itself.
- Visual inspection: Check the relay and its sockets for signs of corrosion, burning, or loose connections.
- Control circuit voltage: With the ignition ON, use a multimeter to verify there is 12 volts at the coil terminals of the fuel pump relay (the terminals that energize the relay).
- Pump side test: With the relay temporarily removed, you can carefully apply power to the pump circuit (only if you know the correct pins and follow safety procedures) to see if the pump runs directly.
- Swap with a known‑good relay: If you have a relay of the same type, swapping it in is a quick way to determine if the original relay is faulty.
Concluding: If the pump does not run when the relay is energized, the fault may lie elsewhere in the fuel system (pump, wiring, or PCM control) rather than the relay coil itself.
What else to check if the relay tests fine
If the relay checks out but the vehicle still won’t start or sustain operation, broader fuel‑system diagnostics are warranted. Other components can mimic relay failure, so a broader checkup is prudent.
- Fuel pressure test: Use a fuel pressure gauge on the rail to confirm the pump is delivering the correct pressure for your engine.
- Electrical grounds and wiring: Inspect grounds and wiring harnesses related to the fuel pump for corrosion or damage.
Concluding: A no‑start or intermittent performance issue can have multiple causes. Use a process of elimination beginning with the relay, then the pump, then the PCM and wiring.
Summary
On a 2011 Jeep Grand Cherokee, the fuel pump relay is housed inside the engine‑bay Power Distribution Center (PDC). Open the PDC, locate the relay labeled “FUEL PUMP,” and perform basic coil and circuit tests or swap in a known good relay to diagnose. If issues persist, extend the diagnostic to fuel pressure and electrical wiring to pinpoint the fault.