🔧 Tahoe - Fuel Pump Module Replacement

On your Tahoe, the fuel pump is part of an in-tank fuel pump module. Replacing it usually requires lowering the fuel tank to access the locking ring on top of the tank.

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

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⚠️ Safety & Precautions

• 🧯 Work outside or in a very well-ventilated area; fuel vapors are extremely flammable.
• 🔥 No smoking, no heaters, no grinding/sparks, and keep a fire extinguisher nearby.
• 🕶️ Wear safety glasses and fuel-resistant gloves; gas in the eyes burns fast.
• 🔋 Disconnect the negative battery cable before disconnecting fuel lines.
• 🛑 Support the SUV with jack stands; never rely on a floor jack alone.
• ⛽ Relieve fuel pressure before opening any fuel line to prevent spray.

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🔧 Required Tools

You'll need the following tools for this repair:

• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Wheel chocks
• Transmission jack (specialty)
• Socket set (8mm-18mm)
• 15mm socket
• 13mm socket
• 10mm socket
• 3/8" drive ratchet
• 3/8" drive torque wrench
• Flat-blade screwdriver
• Fuel line quick-disconnect tool set (5/16" and 3/8")
• Pliers
• Brass drift punch (specialty)
• Small hammer
• Shop towels
• Drain pan
• Safety glasses
• Nitrile gloves

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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) - Qty: 1
• Fuel line retainer clips - Qty: 1 set

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📋 Before You Begin

• 🧰 Run the fuel level as low as possible; a full tank is heavy and dangerous.
• 🅿️ Park on level ground, set the parking brake, and chock the front wheels.
• 🔌 Plan to replace the seal (O-ring) no matter what; reusing it often causes leaks.
• 📌 A “quick-disconnect tool” is a small plastic tool that releases the spring-lock inside GM fuel line fittings.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Relieve fuel pressure

• Use needle-nose pliers to remove the fuel pump relay from the underhood fuse block (fuel pump relay location is labeled on the fuse box cover).
• Start the engine and let it run until it stalls; crank for 2-3 more seconds to bleed off remaining pressure.
• Turn the key OFF and reinstall the relay with needle-nose pliers.

Step 2: Disconnect the battery

• Use a 10mm socket to disconnect the negative battery cable.

Step 3: Raise and support the rear

• Use a floor jack to lift at the approved rear jacking point, then set the SUV on jack stands.
• Place wheel chocks at the front wheels.

Step 4: Support the fuel tank

• Position a transmission jack under the fuel tank with a flat board/pad (so it doesn’t dent the tank).
• Snug the tank up to the jack saddle so it can’t shift.

Step 5: Remove the spare tire if it blocks access

• Use the factory tire tool (from the jack kit) to lower/remove the spare if it prevents you from reaching the tank straps and connections.

Step 6: Disconnect the filler neck and vent hoses

• Use a flat-blade screwdriver to loosen the hose clamps at the tank filler/vent connections.
• Twist and pull the hoses off by hand; use pliers carefully if they’re stuck.
• Tip: Twist first, then pull.

Step 7: Lower the tank slightly to reach the top connections

• Use a 15mm socket and 3/8" drive ratchet to remove the fuel tank strap bolts, keeping the tank supported on the transmission jack.
• Slowly lower the tank a few inches with the transmission jack until you can reach the electrical connector and fuel/EVAP lines on top.
• Torque to 25 Nm (18 ft-lbs) when reinstalling the fuel tank strap bolts.

Step 8: Disconnect electrical connector and EVAP lines

• Unplug the pump module connector by hand; use a flat-blade screwdriver only to gently release the locking tab if needed.
• Disconnect EVAP vapor lines by releasing the plastic locks by hand; use pliers carefully if they’re stubborn.
• Cover openings with shop towels to keep dirt out.

Step 9: Disconnect the fuel feed line

• Place a drain pan and shop towels under the connection.
• Use the fuel line quick-disconnect tool set (5/16" and 3/8") to release the fuel line fitting, then pull the line off.
• Cap/cover the line with shop towels to reduce dripping.

Step 10: Lower and remove the fuel tank

• Double-check all lines and wiring are free.
• Use the transmission jack to lower the tank fully, then slide it out from under the SUV.

Step 11: Clean the area and remove the lock ring

• Blow/brush dirt away from the pump module area so debris doesn’t fall into the tank; use shop towels to wipe clean.
• Use a brass drift punch (specialty) and small hammer to tap the lock ring counterclockwise until it releases.
• Tip: Brass helps prevent sparks.

Step 12: Remove the fuel pump module

• Lift the module out slowly by hand, tilting as needed to clear the float arm.
• Let fuel drain into the tank; use shop towels to catch drips.
• Remove and discard the old seal (O-ring) by hand.

Step 13: Install the new seal and module

• Install the new seal (O-ring) onto the tank opening by hand.
• Carefully lower the new module into the tank, keeping the seal in place.
• Reinstall the lock ring and use the brass drift punch (specialty) and small hammer to tap it clockwise until fully seated and aligned.

Step 14: Reinstall the tank and reconnect everything

• Raise the tank with the transmission jack until you can reconnect the top lines and connector.
• Reconnect the electrical connector by hand until it clicks.
• Reconnect fuel line(s) by hand until they click; tug lightly to confirm they’re locked.
• Reconnect EVAP lines by hand until they click.
• Raise the tank fully and install the straps with the 15mm socket and 3/8" drive ratchet.
• Torque to 25 Nm (18 ft-lbs) for the fuel tank strap bolts.
• Reconnect filler/vent hoses and tighten clamps with a flat-blade screwdriver.

Step 15: Reinstall spare tire (if removed) and lower the SUV

• Reinstall/raise the spare using the factory tire tool.
• Use the floor jack to lift slightly, remove jack stands, then lower to the ground.

Step 16: Reconnect battery and prime the fuel system

• Reconnect the negative battery cable using a 10mm socket.
• Turn the key to ON (engine off) for 5 seconds, then OFF; repeat 3 times to prime the system.
• Start the engine and let it idle.

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✅ After Repair

• 🔍 Check for fuel leaks at the tank connections and fuel line fitting while it idles.
• 🧪 If the engine cranks long, cycle the key ON/OFF a few more times to build pressure.
• 🛠️ If you have a scan tool, check for stored codes and clear any fuel system/EVAP codes after confirming no leaks.
• 🚗 Take a short test drive, then re-check for leaks one more time.

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💰 DIY vs Shop Cost

Shop Cost: $900-$1,600 (parts + labor)

DIY Cost: $250-$700 (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 3-5 hours.

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🎯 Ready to get started?

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