🔧 Grand Cherokee - Fuel Pump Module Replacement

Replacing the fuel pump on your Grand Cherokee means replacing the in-tank fuel pump module. The fuel tank must be lowered because the pump is mounted on top of the tank, so this is a careful job with fuel and vehicle-support safety involved.

Difficulty Level: Advanced | Estimated Time: 3-5 hours

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⚠️ Safety & Precautions

• ⚠️ Gasoline is extremely flammable. Work outside or in a very well-ventilated area away from flames, heaters, cigarettes, sparks, and extension cords.
• ⚠️ Disconnect the negative battery cable before opening the fuel system.
• ⚠️ Relieve fuel pressure before disconnecting fuel lines. Fuel pressure can spray fuel if skipped.
• ⚠️ Support your Grand Cherokee only with jack stands, never with a floor jack alone.
• ⚠️ The fuel tank is heavy, especially with fuel inside. Run the tank near empty before starting.
• ⚠️ Wear safety glasses and fuel-resistant gloves. Fuel can injure eyes and irritate skin.
• ⚠️ Do not use impact tools near the open fuel tank. Sparks are dangerous around fuel vapors.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 13mm socket
• 15mm socket
• 3/8-inch ratchet
• 3/8-inch extension set
• Torque wrench, 10-100 ft-lbs
• Fuel line disconnect tool set (specialty)
• Fuel pump lock ring tool (specialty)
• Flat-blade screwdriver
• Plastic trim tool
• Needle-nose pliers
• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Transmission jack or fuel tank support jack (specialty)
• Wheel chocks
• Drain pan, fuel-safe
• Shop towels
• Fuel-resistant gloves
• Safety glasses
• Class B fire extinguisher

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Fuel pump module assembly - Qty: 1
• Fuel pump module seal/O-ring - Qty: 1
• Fuel pump module lock ring - Qty: 1
• Fuel line retaining clips - Qty: As needed
• Fresh gasoline - Qty: As needed

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📋 Before You Begin

• Park your Grand Cherokee on level ground and set the parking brake.
• Run the fuel level as low as safely possible. A full tank is very heavy and harder to control.
• Place wheel chocks at the front wheels.
• Open the fuel door and remove the fuel cap to reduce tank vapor pressure.
• Disconnect the negative battery cable using a 10mm socket.
• A fuel line disconnect tool releases the plastic spring-lock fitting without breaking it.
• A fuel pump lock ring tool turns the large retaining ring that holds the pump module in the tank.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Relieve Fuel Pressure

• Remove the fuel pump relay or fuel pump fuse from the under-hood power distribution center using the diagram on the fuse cover.
• Reconnect the negative battery cable temporarily using a 10mm socket.
• Start the engine and let it run until it stalls. This uses up fuel pressure in the line.
• Crank the engine for 3-5 seconds once more.
• Disconnect the negative battery cable again using a 10mm socket.
• Keep rags ready for leftover fuel.

Step 2: Raise and Support the Vehicle

• Use a floor jack rated 3-ton minimum to lift the rear of your Grand Cherokee.
• Place jack stands rated 3-ton minimum under the approved rear support points.
• Gently lower the vehicle onto the jack stands.
• Shake the vehicle lightly by hand to confirm it is stable before going underneath.

Step 3: Remove Rear Underbody Shields if Equipped

• Use a 10mm socket or 13mm socket to remove any rear underbody shield fasteners blocking the fuel tank.
• Use a plastic trim tool to release plastic retainers without breaking them.
• Set the shield and fasteners aside in order.

Step 4: Support the Fuel Tank

• Position a transmission jack or fuel tank support jack under the center of the fuel tank.
• Place a wide wood block or padded surface between the jack and tank to spread the load.
• Raise the jack just enough to support the tank. Do not lift the vehicle.

Step 5: Disconnect Fuel Filler and Vent Hoses

• Use needle-nose pliers to release spring clamps on the filler and vent hoses if equipped.
• Use a flat-blade screwdriver carefully to loosen stuck hose ends.
• Twist the hoses gently by hand and pull them off the tank necks.
• Do not pry hard on plastic nipples.

Step 6: Disconnect Electrical Connectors and Fuel Lines

• At the accessible top/side area of the tank, press the lock tabs and unplug the fuel pump electrical connector by hand.
• Use a fuel line disconnect tool set to release the fuel feed line from the pump module connection.
• Place a fuel-safe drain pan underneath and use shop towels to catch small fuel drips.
• If a plastic retainer clip breaks, replace it with a new fuel line retaining clip.

Step 7: Remove the Fuel Tank Straps

• Use a 15mm socket, 3/8-inch ratchet, and 3/8-inch extension to remove the fuel tank strap bolts.
• Keep one hand on the strap as the last threads come out.
• Lower the straps away from the tank.
• Factory strap bolt torque on reassembly is typically Torque to 47 Nm (35 ft-lbs).

Step 8: Lower the Fuel Tank

• Slowly lower the tank using the transmission jack or fuel tank support jack.
• Stop often and check for any remaining hoses, wiring, or clips still attached.
• Use a plastic trim tool to release any harness retainers clipped to the tank.
• Lower the tank enough to access the fuel pump module on top.

Step 9: Clean Around the Fuel Pump Module

• Use shop towels to wipe dirt from the top of the tank around the fuel pump module.
• Do not let dirt fall into the tank opening.
• Cleanliness protects the new pump.

Step 10: Remove the Fuel Pump Module Lock Ring

• Use the fuel pump lock ring tool with a 3/8-inch ratchet to rotate the lock ring counterclockwise.
• Remove the lock ring and set it aside if you are comparing it to the new one.
• Lift the fuel pump module straight up slowly.
• Tilt the module carefully to drain fuel from the reservoir back into the tank.
• Remove the old seal/O-ring from the tank opening.

Step 11: Install the New Fuel Pump Module

• Install the new fuel pump module seal/O-ring into the tank groove by hand.
• Lower the new fuel pump module assembly into the tank in the same orientation as the old one.
• Make sure the module sits flat and does not pinch the seal.
• Install the new fuel pump module lock ring.
• Use the fuel pump lock ring tool and 3/8-inch ratchet to tighten the ring fully until it locks against the tank stops.

Step 12: Raise and Reconnect the Fuel Tank

• Use the transmission jack or fuel tank support jack to raise the tank slowly.
• Reconnect the fuel line until it clicks. Tug lightly by hand to confirm it is locked.
• Reconnect the electrical connector until the lock tab clicks.
• Reconnect filler and vent hoses using needle-nose pliers for spring clamps.
• Make sure no hoses are kinked or trapped above the tank.

Step 13: Reinstall Fuel Tank Straps

• Position the tank straps by hand.
• Start the strap bolts by hand first to avoid cross-threading.
• Use a 15mm socket and 3/8-inch ratchet to snug the bolts.
• Use a torque wrench, 10-100 ft-lbs to tighten the fuel tank strap bolts to Torque to 47 Nm (35 ft-lbs).

Step 14: Reinstall Underbody Shields

• Lift the shields back into place by hand.
• Use a 10mm socket or 13mm socket to reinstall the fasteners.
• Use a plastic trim tool to seat any plastic retainers.
• Do not overtighten plastic shield fasteners.

Step 15: Lower the Vehicle and Prime the Fuel System

• Use the floor jack rated 3-ton minimum to lift slightly off the jack stands.
• Remove the jack stands rated 3-ton minimum.
• Lower your Grand Cherokee to the ground.
• Reinstall the fuel pump fuse or relay.
• Reconnect the negative battery cable using a 10mm socket.
• Turn the ignition to ON without starting for 5 seconds, then OFF for 10 seconds.
• Repeat this key cycle 3-4 times to fill the new pump and lines.

Step 16: Start and Leak Check

• Start the engine and let it idle.
• Use safety glasses and inspect under the vehicle for fuel leaks.
• Check around the tank, fuel line connector, filler hose, and vent hose.
• If you smell raw fuel or see wet fuel, shut the engine off immediately and repair the leak before driving.

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✅ After Repair

• Let the engine idle for several minutes and confirm smooth running.
• Drive gently for 5-10 minutes, then recheck for leaks and fuel smell.
• Make sure the fuel gauge reads properly after adding fuel.
• If the engine cranks longer than normal, cycle the ignition ON/OFF again to prime the system.
• If a check engine light appears, scan for fuel system or evaporative emissions codes.

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💰 DIY vs Shop Cost

Shop Cost: $850-$1,450 (parts + labor)

DIY Cost: $250-$650 (parts only)

You Save: $600-$800 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 2.5-4.0 hours.

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🎯 Ready to get started?

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