🔧 Fuel Pump - Replacement

The fuel pump on your Sierra is inside the fuel tank, so the job means relieving fuel pressure, lowering the tank, and swapping the pump module. This is a moderate repair because of the tank weight, fuel handling, and rusted fasteners.

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

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⚠️ Safety & Precautions

• Work outside or in a very well-ventilated area. Gasoline fumes are flammable.
• Do not smoke, weld, or use open flames anywhere nearby.
• Relieve fuel system pressure before opening any lines.
• Keep a fire extinguisher rated for fuel fires nearby.
• The fuel tank is heavy, even when partially empty. Support it securely before removing straps.
• Disconnect the negative battery cable before starting.

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🔧 Required Tools

You'll need the following tools for this repair:

• 3/8-inch ratchet
• 10mm socket
• 13mm socket
• 15mm socket
• Fuel line disconnect tool set
• Flat-blade screwdriver
• Torque wrench
• Floor jack (rated 3-ton minimum)
• Jack stands
• Wood block
• Drain pan
• Shop towels
• 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 tank seal - Qty: 1
• Fuel tank strap bolts - Qty: 2-4
• Fuel filter - Qty: 1

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📋 Before You Begin

• Run the fuel level as low as safely possible before starting. Less fuel makes the tank easier to lower.
• Park on level ground and set the parking brake.
• Disconnect the negative battery cable with a 10mm socket.
• Relieve fuel pressure at the Schrader valve on the fuel rail if equipped.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Disconnect power and relieve fuel pressure

• Use a 10mm socket to disconnect the negative battery cable.
• If equipped, place a shop towel over the fuel rail service valve and carefully depress the valve core to bleed off pressure.
• Keep rags away from exhaust parts.

Step 2: Raise and support the truck

• Use a floor jack and jack stands to raise the rear of the truck securely.
• Make sure the truck is stable before you go underneath it.

Step 3: Support the fuel tank

• Place the fuel tank on a floor jack with a wood block between the jack and tank.
• Lift it just enough to hold the tank before removing the straps.

Step 4: Remove the fuel filler neck and vent connections

• Use a flat-blade screwdriver and 10mm socket as needed to loosen the filler neck shield or retaining hardware.
• Disconnect any vent or filler hose clamps carefully.

Step 5: Disconnect the fuel lines and wiring

• Use the fuel line disconnect tool set to release the fuel supply line and EVAP line connections at the tank.
• Unplug the fuel pump electrical connector by hand.
• Inspect the connectors for dirt or rust before reassembly.

Step 6: Remove the fuel tank straps

• Use a 15mm socket to remove the tank strap bolts.
• Lower the tank slowly with the jack and guide all hoses and wires clear as you lower it.
• Do not let the tank hang on a line.

Step 7: Remove the fuel pump module

• Clean the top of the tank with shop towels so dirt does not fall inside.
• Disconnect the remaining electrical connector and fuel line at the top of the module.
• Use a fuel pump lock ring tool (specialty) or a brass drift and hammer carefully to remove the lock ring.
• Lift the old fuel pump module out of the tank.

Step 8: Install the new fuel pump module

• Install the new fuel pump tank seal in the tank opening.
• Lower the new fuel pump module into place, making sure the float and pickup clear the opening.
• Install and tighten the lock ring fully with the fuel pump lock ring tool (specialty).
• Torque to specification per service manual if using a calibrated lock-ring tool.

Step 9: Reinstall the tank

• Raise the tank with the floor jack and wood block.
• Reconnect the fuel lines and electrical connector.
• Reinstall the tank straps using a 15mm socket.
• Torque the tank strap bolts to 25 Nm (18 ft-lbs).

Step 10: Reconnect filler neck and battery

• Reconnect the filler neck, vent lines, and clamps.
• Reinstall any shields or brackets removed earlier using a 10mm socket.
• Reconnect the negative battery cable with a 10mm socket.

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✅ After Repair

• Cycle the key to ON for 5 seconds, then OFF. Repeat 3 times to prime the fuel system.
• Start the engine and check for fuel leaks at the tank and fuel lines.
• Listen for the fuel pump prime noise before cranking.
• Test drive briefly and recheck for leaks.

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💰 DIY vs Shop Cost

Shop Cost: $700-$1,400 (parts + labor)

DIY Cost: $250-$600 (parts only)

You Save: $450-$800 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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