07 Impala Fuel Pump Replacement: A Complete Step-by-Step Guide

Replacing the fuel pump in your 2007 Chevrolet Impala is a challenging but achievable DIY task that requires 3-5 hours, basic mechanical tools, and strict safety precautions. Ignoring failing fuel pump symptoms often leads to complete vehicle breakdown. This guide delivers a detailed, methodical procedure to replace your Impala's fuel pump assembly correctly, saving you 900 in shop labor costs.

Why Your 2007 Impala Fuel Pump Fails

Fuel pumps in the 2007 Impala commonly fail due to sediment-clogged filters, overheating from frequent low-fuel driving, or worn electrical components. Symptoms include:

  • Engine sputtering or loss of power at high speeds
  • Extended cranking before starting
  • Complete engine stall, especially under acceleration
  • Inconsistent fuel pressure readings (diagnosable with an OBD-II scanner)
    Ignoring these signs risks stranding you and damaging fuel injectors. Replacing the pump promptly prevents costly secondary failures.

Essential Tools and Parts

Gather these items before starting:

  • New Fuel Pump Assembly: ACDelco GM Original Equipment (MU1627) or Bosch 69490 (ensure it includes the fuel level sender and pump strainer).
  • Basic Tools: Socket set (10mm, 13mm, 15mm), Torx T20 driver, flathead screwdriver, fuel line disconnect tools.
  • Safety Gear: Safety glasses, nitrile gloves, fire extinguisher.
  • Supplies: Shop rags, plastic bags for fuel lines, dielectric grease.
    Never substitute OEM parts—compatible pumps prevent fitment and wiring issues.

Critical Safety Protocols

Relieving fuel system pressure is mandatory:

  1. Locate the fuel pump fuse (#48, 15A) under the rear passenger seat fuse box.
  2. Start the engine and let it stall (pressure depletion takes 10-20 seconds).
  3. Remove the fuse and crank the engine again for 5 seconds to purge residual pressure.
    Additional precautions:
  • Disconnect the negative battery terminal.
  • Ensure the workspace is smoke-free and ventilated.
  • Use fuel-rated containers for drained gasoline (expect 5-8 gallons in a full tank).

Step-by-Step Replacement Procedure

Accessing the Fuel Pump:

  1. Fold down the rear seat and peel back the carpet to expose the metal access panel.
  2. Remove the eight 10mm bolts securing the panel. Pry it open gently—sealed edges may require careful cutting.
  3. Unclip the electrical connector. Push the red tab downward to release.

Disconnecting Fuel Lines:

  1. Squeeze the plastic tabs on the quick-connect fittings using fuel line disconnect pliers.
  2. Slide the fittings off the pump assembly’s metal nipples. Immediately cap open lines with plastic bags.

Removing the Old Pump:

  1. Loosen the eight Torx T20 screws securing the fuel pump lock ring (clockwise = tighter; counterclockwise = looser).
  2. Lift the assembly upward, tilting it slightly to clear the tank opening. Note the alignment tab for reinstallation.

Installing the New Pump:

  1. Transfer the rubber seal from the old assembly to the new pump. Lubricate it lightly with clean motor oil.
  2. Align the pump’s orientation key with the notch in the tank. Lower it vertically—avoid angling.
  3. Tighten the lock ring evenly in a cross pattern until hand-tight. Over-tightening warps the seal.

Reassembly and Testing:

  1. Reconnect the electrical plug and fuel lines until they "click."
  2. Replace the access panel and bolt it securely.
  3. Reinstall the fuel pump fuse and battery cable.
  4. Cycle the ignition to "ON" (without starting) for 2 seconds, 3 times. This pressurizes the system.
  5. Start the engine. Check for leaks or unusual noises. Scan for persistent P0087/P0190 codes.

Troubleshooting Post-Installation Issues

  • Engine won’t start: Verify fuse integrity and electrical connections. Check for reversed fuel feed/return lines.
  • Fuel gauge inaccuracies: Ensure the sender arm floats freely and isn’t bent. Ground the sender wire to test gauge calibration.
  • Persistent stalling: Inspect for cracked hoses or an unseated lock ring causing pressure loss.

Professional Repair Cost Breakdown

Mechanic replacements typically cost 900:

  • Parts: 220 (OEM pump)
  • Labor: 2.5–3 hours at 150/hour
  • Shop fees: 100 for fuel disposal/diagnostics
    DIY costs range from 300 (parts only). Investing in tools often pays off long-term for Impala owners.

Completing a 2007 Impala fuel pump replacement demands patience and strict adherence to safety guidelines, but with this guide, you avoid costly tow bills and garage fees. Procrastinating this repair risks sudden breakdowns. Address symptoms immediately using this procedure—the effort ensures reliable transportation and thousands saved. Always double-check O-ring seals and wiring integrity during installation, as minor oversights cause major operational failures.

Use OEM replacement parts for guaranteed compatibility. Record the pump’s manufacturing date—new units carry a limited lifetime warranty.

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