🔧 Armada - Fuel Pump Replacement

On your Armada, the fuel pump is part of an in-tank fuel pump module (pump + level sensor + regulator on many setups). Replacement is very doable at home, but the exact procedure depends on whether your Armada has an interior access cover or if the fuel tank must be lowered.

Difficulty Level: Intermediate | Estimated Time: 2-5 hours

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⚠️ Safety & Precautions

• ⚠️ Work outside or in a very well-ventilated area; fuel vapors ignite easily.
• ⚠️ No smoking, no flames, no drop lights with hot bulbs.
• ⚠️ Keep a Class B fire extinguisher nearby.
• ⚠️ Relieve fuel pressure before disconnecting lines to prevent spray.
• ⚠️ Disconnect the negative battery cable before opening the tank/module.
• ⚠️ Clean dirt off the tank top before opening it; dirt can ruin the new pump.
• ⚠️ If you must lower the tank, support it with a jack and a wide board so it can’t slip.

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🔧 Required Tools

You'll need the following tools for this repair:

• Nitrile gloves
• Safety glasses
• Class B fire extinguisher
• 10mm socket
• 12mm socket
• 14mm socket
• 3/8" drive ratchet
• 3/8" drive extension set
• Torque wrench (3/8" drive)
• Flat trim removal tool
• Phillips screwdriver #2
• Fuel line quick-disconnect tool set
• Pliers (hose clamp)
• Brass punch set (specialty)
• Dead-blow hammer
• Shop towels
• Drain pan (gasoline-safe)
• Hand siphon pump (gasoline-safe)
• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Wheel chocks
• Wood board 2x8" (about 18-24")
• Work light (LED)

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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 strainer (sock filter) - Qty: 1
• Fuel line retaining clips (if damaged) - Qty: 1 set

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📋 Before You Begin

• Park your Armada on level ground and set the parking brake.
• Chock the front wheels with wheel chocks.
• Try to run the fuel level down to about 1/4 tank (a full tank is heavy and messy).
• Plan where gasoline will go: set a gasoline-safe drain pan and lots of shop towels nearby.
• Quick question (1 of 2): Do you see a removable access cover under the rear cargo floor or under the rear seat area (usually a metal plate with screws)? If you can, upload a photo of the cargo floor/under-seat area with carpet lifted.
• Quick question (2 of 2): Are you replacing the entire fuel pump module, or only the pump motor inside the module?

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Relieve fuel pressure

• Open the hood.
• Use a 10mm socket to disconnect the negative battery terminal and isolate it so it can’t spring back.
• Remove the fuel pump fuse/relay from the under-hood or interior fuse box (use your owner’s manual map).
• Start the engine and let it run until it stalls. Crank for 3-5 seconds to bleed off remaining pressure.
• Less pressure = less fuel spray.

Step 2: Decide which access method you have

• If you have an interior access cover, follow Path A.
• If you do not have an access cover, you’ll need to lower the fuel tank—follow Path B.

Step 3 (Path A): Open the interior access cover

• Lift the rear cargo floor panel and/or fold seats as needed.
• Use a flat trim removal tool to lift clips and pull back carpet/insulation carefully.
• Remove the access cover fasteners using a Phillips screwdriver #2 or 10mm socket (varies by cover style).
• Use a work light (LED) to confirm you can see the top of the fuel pump module.

Step 4 (Path A): Clean and disconnect at the module

• Blow/brush dirt away from the module area, then wipe with shop towels.
• Unplug the electrical connector(s) at the module.
• Disconnect the fuel line(s): use the fuel line quick-disconnect tool set if equipped, and catch drips with shop towels.
• Take a photo before disconnecting lines.

Step 5 (Path A): Remove the lock ring and lift out the module

• Most Armada setups use a locking ring. Place a brass punch set (specialty) on a lock-ring tab and tap with a dead-blow hammer to rotate it loose.
• Brass punch: a soft metal drift that reduces spark risk versus steel.
• Lift the module straight up slowly; angle as needed to clear the float arm without bending it.
• Remove the old tank seal (O-ring) and discard it.

Step 6 (Path A): Install the new seal and module

• Install the new fuel pump module tank seal (O-ring/gasket) in the tank groove.
• Lower the new module in carefully, guiding the float arm and strainer so they don’t fold or snag.
• Reinstall the lock ring and tighten it by tapping with the brass punch set (specialty) and dead-blow hammer until it fully seats and aligns to its stops/marks.

Step 7 (Path A): Reconnect and close up

• Reconnect fuel line(s) until they click/lock; gently pull to confirm they’re latched.
• Reconnect electrical connector(s).
• Reinstall the access cover using the same fastener tool you removed it with (Phillips screwdriver #2 or 10mm socket).
• Reposition carpet/insulation and trim using the flat trim removal tool as needed.

Step 8 (Path B): Safely raise the vehicle (tank-drop method)

• Place wheel chocks at the front wheels.
• Lift the rear with a floor jack (rated 3-ton minimum) and support it on jack stands (rated 3-ton minimum) under approved rear lift/support points.
• Position the floor jack under the fuel tank with the wood board 2x8" between jack and tank to spread the load.

Step 9 (Path B): Disconnect lines and wiring before lowering

• Disconnect the filler neck/vapor hoses using pliers (hose clamp) (if spring clamps are used).
• Disconnect fuel feed/return lines using the fuel line quick-disconnect tool set.
• Unplug the fuel pump module electrical connector(s).
• Keep a drain pan (gasoline-safe) ready for drips.

Step 10 (Path B): Lower the tank enough to access the module

• Support the tank firmly with the floor jack and wood board 2x8".
• Remove the tank strap bolts using a 14mm socket and 3/8" drive ratchet.
• Lower the tank slowly a few inches and check for any remaining hoses/wires before lowering more.

Step 11 (Path B): Swap the module (same as Path A at the tank top)

• Clean the tank top with shop towels.
• Remove the lock ring using the brass punch set (specialty) and dead-blow hammer.
• Replace the module seal and install the new module the same way as in Path A.

Step 12 (Path B): Reinstall tank

• Raise the tank with the floor jack and line it up carefully.
• Reinstall tank straps/bolts using the 14mm socket and finish with a torque wrench (3/8" drive).
• If you tell me whether you have Path A or B, I’ll give you the exact factory torque values for the fasteners you touch.

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✅ After Repair

• Reinstall the fuel pump fuse/relay.
• Reconnect the battery negative terminal using a 10mm socket.
• Prime the system: key ON for 5 seconds, key OFF for 5 seconds, repeat 3-4 times (do not crank during priming).
• Start the engine and let it idle while you check for leaks at every fuel connection you touched.
• If you dropped the tank, re-check for drips after a short test drive.
• If the check engine light comes on, scan codes before driving far (a loose EVAP hose can set a leak code).

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💰 DIY vs Shop Cost

Shop Cost: $900-$1,800 (parts + labor)

DIY Cost: $250-$900 (parts only)

You Save: $650-$900 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 2-4 hours.

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