🔧 Impala - Fuel Pump Replacement

On your Impala, the fuel pump is an in-tank module that supplies high-pressure fuel to the engine. Replacement usually means removing the fuel tank (some cars have an access panel; many do not), swapping the pump module, then re-priming the system and checking for leaks.

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

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⚠️ Safety & Precautions

• ⚠️ Work outside or in a well-ventilated area; fuel vapors ignite easily.
• ⚠️ No smoking, no heat guns, no drop lights with hot bulbs; use an LED work light.
• ⚠️ Disconnect the 12V battery before disconnecting fuel lines.
• ⚠️ Relieve fuel pressure before opening the fuel system to avoid spray.
• ⚠️ Support the tank with a transmission jack; a partially full tank is heavy.
• ⚠️ Wear safety glasses and fuel-resistant gloves.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• Class B fire extinguisher
• Wheel chocks
• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Transmission jack (specialty)
• Metric socket set (8mm–18mm)
• 3/8" drive ratchet
• 1/2" drive ratchet
• Torque wrench (10–200 Nm range)
• Flat-blade screwdriver
• Trim clip removal tool
• Fuel line quick-disconnect tool set (specialty)
• Pliers
• Brass drift punch set (specialty)
• Small hammer
• Catch pan (fuel-safe)
• Shop rags
• LED work light
• OBD2 scan tool (specialty)

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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 retaining clips (if equipped) - Qty: 1
• Evaporative emission hose clamps (as needed) - Qty: 1

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📋 Before You Begin

• Park your Impala on level ground and set the parking brake.
• Drive until the fuel level is low (under 1/4 tank makes this much easier).
• Relieve fuel pressure: remove the fuel pump fuse/relay, then crank the engine a few seconds until it stalls; turn key OFF.
• Disconnect the negative battery cable using a socket and move it aside so it can’t touch the terminal.
• Confirm access method: check under the rear seat cushion/trunk floor for an access cover. If there is no access cover, you’ll be dropping the tank.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Verify whether you have an access cover

• Check under the rear seat bottom cushion and under the trunk floor for a round/oval metal or plastic cover.
• If you find a cover, go to Step 2A.
• If you do not find a cover, go to Step 2B (fuel tank removal).

Step 2A: Access-cover method (if equipped)

• Remove interior trim/clips with a trim clip removal tool and flat-blade screwdriver.
• Remove the access cover fasteners using a metric socket and ratchet.
• Clean dirt off the top of the module with shop rags so nothing falls in the tank.

Step 2B: Fuel tank removal method (most common)

• Raise the rear of the car with a floor jack (rated 3-ton minimum) and support it with jack stands (rated 3-ton minimum); chock the front wheels with wheel chocks.
• Support the fuel tank with a transmission jack (specialty). Don’t balance it on a floor jack.
• Remove any underbody shields near the tank using a metric socket and ratchet.

Step 3: Disconnect EVAP and fuel connections

• Place a catch pan (fuel-safe) under the connection points and keep shop rags ready.
• Disconnect EVAP vapor lines using pliers (for clamps) or by releasing quick-connect tabs by hand.
• Disconnect fuel feed/return lines using a fuel line quick-disconnect tool set (specialty).
• Unplug the fuel pump electrical connector.

Step 4: Lower and remove the tank (tank-removal method)

• Loosen/remove the tank strap bolts using the correct metric socket and ratchet.
• Lower the tank slowly with the transmission jack (specialty), watching for any hoses/wires still attached.
• Slide the tank out from under the vehicle once fully free.
• Tightening note for reassembly: use a torque wrench (10–200 Nm range) and Torque to GM service specification for tank straps and shield fasteners.

Step 5: Remove the fuel pump module from the tank

• Clean the area around the lock ring with shop rags.
• Remove the lock ring using a brass drift punch set (specialty) and small hammer by tapping it counterclockwise.
• Lift the module out carefully; angle it as needed to clear the float arm without bending it.
• Remove and discard the old seal/O-ring.

Step 6: Install the new module and seal

• Install the new tank seal/O-ring (lightly wipe clean; do not use grease unless the seal instructions allow it).
• Lower the new module into the tank, keeping the float arm free and not pinched.
• Reinstall the lock ring and tighten it with the brass drift punch set (specialty) and small hammer until fully seated/locked.

Step 7: Reinstall the tank (tank-removal method)

• Raise the tank back into position using the transmission jack (specialty).
• Reconnect electrical connector and all EVAP/fuel quick-connect lines; pull gently to confirm they are locked.
• Reinstall tank straps and tighten using a torque wrench (10–200 Nm range); Torque to GM service specification.
• Reinstall underbody shields using a metric socket and ratchet; Torque to GM service specification.

Step 8: Restore power and prime the system

• Reconnect the battery negative cable using a metric socket and ratchet; Torque to GM service specification.
• Reinstall the fuel pump fuse/relay (if removed) by hand.
• Prime fuel pressure: key ON for 5 seconds, key OFF for 10 seconds; repeat 3 times before cranking.
• If you have an OBD2 scan tool (specialty), run the fuel pump prime output test if available.

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✅ After Repair

• Start the engine and let it idle for 2–3 minutes.
• Check carefully for leaks at the tank, lines, and module seal area (look and smell).
• Road-test gently, then re-check for leaks.
• If the check engine light comes on, scan with an OBD2 scan tool (specialty) and address any EVAP/fuel pressure codes.

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💰 DIY vs Shop Cost

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

DIY Cost: $300-$900 (parts only)

You Save: $600-$900 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 3-6 hours.

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🎯 Ready to get started?

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