🔧 Grand Cherokee - Fuel Pump Replacement

On your Grand Cherokee, the fuel pump is part of an in-tank fuel pump module. The job is mainly about safely lowering the fuel tank, swapping the module and seal, then reinstalling everything without creating leaks.

Difficulty Level: Advanced | Estimated Time: 3-6 hours

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⚠️ Safety & Precautions

• 🧯 Work outside or in a very well-ventilated area; fuel vapors ignite easily.
• 🔥 No smoking, no sparks, no trouble lights with hot bulbs; use an LED work light.
• 🛑 Relieve fuel pressure before disconnecting any fuel line to prevent spray.
• 🔋 Disconnect the negative battery cable before lowering the tank.
• 🧱 Support the vehicle with jack stands; never rely on a floor jack alone.
• ⛽ A full tank is very heavy; siphon fuel to make the tank easier to handle.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• Fire extinguisher (Class B)
• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Wheel chocks
• Transmission jack (specialty)
• Socket set (8mm, 10mm, 13mm, 15mm)
• Ratchet
• Extension set (3" and 6")
• Torque wrench (10-150 ft-lbs range)
• Flat-blade screwdriver
• Needle-nose pliers
• Fuel line quick-disconnect tool set
• Brass punch (specialty)
• Hammer
• Siphon pump (hand pump)
• Drain pan
• Shop rags
• LED work light

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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 tank seal (O-ring gasket) - Qty: 1
• Fuel pump module lock ring - Qty: 1

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📋 Before You Begin

• Park on level ground, set the parking brake, and chock the front wheels.
• Siphon fuel out if the tank is above 1/4 full. Lighter tank = safer job.
• Relieve fuel pressure before opening any fuel line.
• Disconnect the negative battery cable using a 10mm socket.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Relieve fuel system pressure

• Open the hood and remove the fuel pump relay from the under-hood fuse/relay box (use the diagram on the lid).
• Start the engine and let it run until it stalls.
• Crank the engine for 3-5 seconds to bleed off remaining pressure.
• Turn the key off.

Step 2: Disconnect the battery

• Use a 10mm socket to disconnect the negative battery cable and set it aside so it can’t spring back.

Step 3: Raise and support the vehicle

• Lift the rear of the vehicle with a floor jack (rated 3-ton minimum).
• Set it securely on jack stands (rated 3-ton minimum) under the frame.

Step 4: Support the fuel tank

• Position a transmission jack (specialty) under the fuel tank and apply light upward pressure.
• If using a regular jack, use a wide, flat support surface. Don’t point-load the tank.

Step 5: Disconnect the filler neck and vent connections

• Use a flat-blade screwdriver or 8mm socket (depending on clamp type) to loosen the hose clamps at the filler neck area.
• Use needle-nose pliers to release any spring clamps.
• Carefully twist and pull the hoses off. Use shop rags to catch drips.

Step 6: Lower the tank slightly to access the top connections

• Use a 13mm socket or 15mm socket (varies by fastener) with a ratchet and extensions to loosen/remove the fuel tank strap bolts.
• Slowly lower the tank a few inches with the transmission jack (specialty) so you can reach the lines on top.
• Torque to 47 Nm (35 ft-lbs) when reinstalling the tank strap bolts.

Step 7: Disconnect electrical connector, EVAP lines, and fuel line

• Unplug the fuel pump module electrical connector by hand; use a flat-blade screwdriver gently if the lock tab is stubborn.
• Disconnect EVAP/vapor lines by releasing their clips; use needle-nose pliers if needed.
• Disconnect the main fuel line using a fuel line quick-disconnect tool set (this tool slides into the fitting to release the internal spring lock).
• Place a drain pan underneath and wrap the connection with shop rags to catch fuel.

Step 8: Lower and remove the fuel tank

• With everything disconnected, lower the tank fully using the transmission jack (specialty).
• Slide the tank out from under the vehicle.

Step 9: Clean the area and remove the fuel pump lock ring

• Use shop rags to clean dirt off the top of the tank around the module. Dirt in tank = future problems.
• Use a brass punch (specialty) and hammer to tap the lock ring counterclockwise until it releases.
• Remove the lock ring and lift the module straight up, tilting as needed to clear the float arm.

Step 10: Install the new seal and fuel pump module

• Remove the old tank seal and install the new fuel pump module tank seal (O-ring gasket) in the groove.
• Install the new module into the tank, keeping the seal seated and not pinched.
• Install the new fuel pump module lock ring and use the brass punch (specialty) and hammer to tighten it clockwise until fully seated and aligned.

Step 11: Reinstall the fuel tank

• Place the tank back onto the transmission jack (specialty) and raise it partway.
• Reconnect the top electrical connector, EVAP lines, and fuel line. Use shop rags to keep everything clean.
• Raise the tank fully and reinstall the straps using a 13mm socket or 15mm socket and ratchet.
• Torque to 47 Nm (35 ft-lbs) for the tank strap bolts.

Step 12: Reconnect filler neck/vent hoses

• Slide hoses fully onto their necks.
• Tighten clamps using a flat-blade screwdriver or 8mm socket (as equipped).

Step 13: Restore power and prime the fuel system

• Reconnect the negative battery cable using a 10mm socket.
• Reinstall the fuel pump relay.
• Cycle the key to ON (engine off) for 3 seconds, then OFF for 10 seconds; repeat 3 times to prime the system.

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✅ After Repair

• Start the engine and let it idle for 2-3 minutes.
• Inspect for leaks at the fuel line quick-connect, module seal area, and filler neck connections using an LED work light.
• Test drive for 10-15 minutes, then recheck for any fuel smell or seepage.
• If you have a check engine light afterward, it may be an EVAP line not fully seated.

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💰 DIY vs Shop Cost

Shop Cost: $850-$1,500 (parts + labor)

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

You Save: $600-$850 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 3-5 hours.

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🎯 Ready to get started?

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