🔧 Grand Cherokee - Fuel Pump Module Replacement

You’ll be replacing the in-tank fuel pump module, which is accessed from under the rear seat, not by dropping the fuel tank. This restores proper fuel pressure if the pump has failed or is noisy, or if you have hard starting or stalling.

Difficulty Level: Intermediate | Estimated Time: 3–4 hours

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⚠️ Safety & Precautions

• 🔥 Work in a very well-ventilated area, away from open flames, heaters, cigarettes, and anything that can ignite fuel vapors.
• ⚡ Disconnect the negative battery cable before opening the fuel system to avoid sparks.
• 🧯 Keep a class B/C fire extinguisher nearby any time you work with fuel.
• 💨 Relieve fuel pressure before disconnecting fuel lines to avoid high-pressure spray.
• 😷 Avoid breathing fuel vapors; if working in a garage, keep doors fully open.
• 🧤 Wear fuel-resistant gloves and safety glasses; gasoline can irritate skin and eyes.
• 🛢️ Keep rags and a small drain pan ready for any fuel spillage and dispose of them safely.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 13mm socket
• 3/8" drive ratchet
• 3/8" drive extension (6")
• Torque wrench (5–80 ft-lbs range)
• Flathead screwdriver (medium)
• Plastic trim removal tool
• Fuel line quick-disconnect tool set
• Fuel pump locking ring tool (specialty)
• Plastic or rubber mallet
• Pliers (needle-nose)
• Shop rags
• Small drain pan
• Flashlight or work light (LED)
• Permanent marker
• Safety glasses
• Nitrile or fuel-resistant gloves

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Fuel pump module assembly (in-tank, with sender) - Qty: 1
• Fuel pump module lock-ring - Qty: 1
• Fuel pump module sealing gasket/O-ring - Qty: 1
• Fuel line retaining clips - Qty: 2–3 (replace any that get damaged)
• Electrical connector dielectric grease - Qty: small tube
• Shop towels/absorbent pads - Qty: 1 pack

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📋 Before You Begin

• Park the Grand Cherokee on level ground, shift to Park, and set the parking brake.
• Ideally, run the fuel level down below half a tank to make the module lighter and reduce spillage.
• Open all doors or work in an open area to avoid fuel vapor build-up.
• Turn ignition OFF and remove the key from the vehicle.
• Disconnect the negative battery terminal:
  • Use a 10mm socket to loosen the clamp nut.
  • Lift the negative cable off and tuck it aside.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Relieve fuel system pressure

• Locate the fuse box under the hood and remove the fuel pump relay or fuse (refer to the fuse box lid diagram).
• Use a 10mm socket if a cover fastener is present.
• With the relay/fuse removed, briefly reconnect the negative battery cable using a 10mm socket.
• Start the engine and let it run until it stalls; crank it for a few more seconds to bleed remaining pressure.
• Turn ignition OFF and disconnect the negative battery cable again with the 10mm socket.
• This step reduces fuel spray at the pump.

Step 2: Remove the rear seat cushion

• Slide the front seats forward to give yourself room.
• The rear seat bottom is clipped/bolted at the front edge.
  • Feel along the front of the rear seat for plastic covers over the bolts (if equipped).
  • Use a plastic trim removal tool to gently pry up the covers.
  • Use a 13mm socket and ratchet to remove the front seat cushion bolts on each side.
• Lift the front edge of the seat cushion up, then pull it forward and out of the vehicle. It may be snug—lift firmly but evenly.
• Note how the seat hooks in at the back.

Step 3: Expose the fuel pump access cover

• Under the right side (passenger side) or center of the rear seat area you’ll see a round metal access panel on the floor.
• Use a plastic trim removal tool or flathead screwdriver to gently pry up the butyl sealant or adhesive holding the access cover.
• Lift off the access cover and set it aside.
• Use a flashlight to locate the fuel pump module top, electrical connector, fuel line, and lock ring.

Step 4: Disconnect the electrical connector

• Locate the multi-pin electrical connector on top of the fuel pump module.
• Press the lock tab on the connector tab using your finger or a flathead screwdriver and gently pull the connector straight off.
• If the connector is tight, wiggle slightly while pulling, but do not pry directly on the wires.
• Inspect for corrosion; apply a tiny amount of dielectric grease later during reassembly.

Step 5: Disconnect the fuel line

• Place a few shop rags around the fuel line connection to catch any fuel.
• Identify the quick-connect fitting on the fuel line.
• Use the appropriate size fuel line quick-disconnect tool to release the internal locking tabs:
  • Slide the tool into the fitting until it seats.
  • Gently pull the line away from the pump while holding the tool pushed in.
• Capped end: If you have caps, cap the exposed line to minimize vapors.
• Remove and set aside any small retaining clips; replace damaged ones later.

Step 6: Clean around the pump and mark alignment

• Use shop rags to wipe dirt and dust off the top of the pump module and surrounding tank area.
• This prevents debris falling into the tank when you open it.
• Use a permanent marker to make alignment marks:
  • Draw a line from the pump module flange to the tank.
  • Draw a line on the lock ring to the tank, showing its original position.
• Marks help orient the new module correctly.

Step 7: Remove the fuel pump lock ring

• Place the fuel pump locking ring tool (specialty) onto the lock ring tabs.
• Use a 3/8" drive ratchet to turn the tool counterclockwise to loosen the ring.
• If you don’t have the special tool, you can carefully tap the ring:
  • Place a flathead screwdriver on a lock ring tab.
  • Tap gently with a plastic or rubber mallet to rotate counterclockwise.
• Remove the lock ring and set it aside; note its orientation and condition.

Step 8: Remove the fuel pump module

• Carefully lift the pump module straight up a few centimeters.
• There is a large sealing gasket under the flange; note its position.
• Slowly tilt the module as you lift to clear the float arm (fuel level sender) from the tank opening without bending it.
• Let fuel drain from the module into the tank as much as possible before fully removing it.
• Place the old module in a small drain pan to catch residual fuel.

Step 9: Remove and inspect the old gasket

• Lift the old sealing gasket/O-ring off the tank opening using your fingers or needle-nose pliers.
• Clean the sealing surface on the tank carefully with shop rags, avoiding pushing debris into the tank.
• Do not reuse a hardened, cracked, or swollen gasket; use the new one.

Step 10: Install the new fuel pump module and gasket

• Place the new sealing gasket/O-ring into the tank groove, making sure it sits flat all around.
• Position the new pump module over the opening, aligning any locating tabs or marks with the mark you made on the tank.
• Carefully lower the module into the tank:
  • Guide the float arm through the opening without bending it.
  • Keep the gasket in place as you seat the module flange.
• Ensure the module flange sits evenly on the gasket with no pinched areas.

Step 11: Reinstall and tighten the lock ring

• Place the new (or cleaned) lock ring over the pump module flange and onto the tank threads.
• Start the ring by hand, turning clockwise until it engages evenly.
• Use the fuel pump locking ring tool (specialty) and 3/8" drive ratchet to tighten the lock ring until your alignment marks line up.
• Tighten to approximately 75 Nm (55 ft-lbs) if using a torque-capable lock-ring tool.
• If tapping with a plastic or rubber mallet, tighten evenly around the ring until fully seated and secure.

Step 12: Reconnect fuel line and electrical connector

• Push the fuel line quick-connect straight onto the pump outlet until you hear or feel a click.
• Gently pull back on the line to confirm it is locked.
• Install new retaining clips if the old ones were damaged.
• Apply a very small amount of dielectric grease to the electrical connector seal if desired.
• Push the electrical connector onto the pump module until it clicks in place.

Step 13: Reinstall the access cover

• Check once more for any loose tools or rags around the opening.
• Place the access cover back over the opening.
• Press it down firmly into the existing adhesive/sealant; if it does not stick well, use suitable automotive sealant or butyl tape to reseal.

Step 14: Reinstall the rear seat cushion

• Slide the rear seat cushion back into place, engaging any rear hooks first.
• Lower the front of the cushion into position.
• Install the front seat cushion bolts using a 13mm socket and ratchet.
• Tighten bolts to approximately 48 Nm (35 ft-lbs).
• Snap any plastic covers back into place using your fingers or a plastic trim removal tool.

Step 15: Reconnect battery and prime the fuel system

• Reconnect the negative battery cable to the battery post.
• Use a 10mm socket to tighten the clamp nut to about 5 Nm (44 in-lbs)—snug, not overtight.
• Reinstall the fuel pump relay or fuse in the fuse box using your fingers.
• Turn the ignition to RUN (engine off) for 5 seconds, then OFF. Repeat this 3–4 times to prime the system and build pressure.

Step 16: Start the engine and check for leaks

• Start the engine and let it idle.
• Listen near the rear seat area; the pump should sound smooth, not overly loud.
• With the engine running, carefully check around the access panel (without removing it) for fuel smell or visible leaks from below if possible.
• If there is any strong fuel smell or visible leakage, shut the engine OFF immediately and re-check connections and lock ring seating.

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✅ After Repair

• Take the Grand Cherokee for a short, gentle drive, monitoring for smooth acceleration and normal power.
• Watch the fuel gauge to confirm it reads reasonably (it may take a moment to stabilize).
• After the drive, recheck for any fuel smells near the rear seat and under the vehicle.
• Properly dispose of old fuel-soaked rags and the old pump module according to local regulations.

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💰 DIY vs Shop Cost

Shop Cost: $700–$1,100 (parts + labor)

DIY Cost: $250–$450 (parts only)

You Save: $450–$650 by doing it yourself!

Shop labor rates typically run $100–$150/hour. This repair takes a shop about 2–3 hours.

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