🔧 Suburban - Fuel Pump Replacement

On your Suburban, the fuel pump is part of an in-tank fuel pump module (it sits inside the fuel tank). Replacing it usually means lowering the fuel tank, swapping the module and seal, then priming the system and leak-checking.

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

---

⚠️ Safety & Precautions

• ⚠️ Work outside or in a very well-ventilated area—fuel vapors are flammable.
• ⚠️ No smoking, sparks, hot lights, or power tools near open fuel lines.
• ⚠️ Keep a Class B fire extinguisher nearby.
• ⚠️ Let the exhaust cool completely before starting.
• ⚠️ Depressurize the fuel system before disconnecting lines to avoid fuel spray.
• ⚠️ Disconnect the negative battery cable to reduce fire risk.
• ⚠️ A full tank is extremely heavy—do this with the tank as close to empty as possible.

---

🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• Class B fire extinguisher
• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Wheel chocks
• Transmission jack (specialty)
• Socket set (8mm–21mm)
• 10mm socket
• 13mm socket
• 15mm socket
• 18mm socket
• 3/8" drive ratchet
• 1/2" drive ratchet
• 6" extension
• Torque wrench (10–150 ft-lbs range)
• Flat-blade screwdriver
• Fuel line quick-disconnect tool set (specialty)
• Fuel pump lock ring removal tool (specialty)
• Brass drift punch
• Small mallet
• Drain pan
• Shop rags
• Non-sparking plastic scraper
• Paint marker

---

🔩 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 (assortment) - Qty: 1
• Dielectric grease - Qty: 1

---

📋 Before You Begin

• Park on level ground, set the parking brake, and chock the front wheels.
• Drive until the fuel level is very low. Less fuel = much easier.
• Open the fuel door and loosen the gas cap to release tank vapor pressure.
• Plan where you’ll set the tank down safely once it’s lowered.

---

🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Depressurize the fuel system

• Open the hood and remove the engine cover (if equipped) by pulling upward by hand.
• Use a fuse puller (or needle-nose pliers if you have them) to remove the fuel pump fuse/relay from the underhood fuse block (the lid diagram shows the exact position).
• Start the engine and let it run until it stalls, then crank for 2–3 seconds more.
• Turn the key off and reinstall the fuse/relay later during reassembly.

Step 2: Disconnect the battery

• Use a 10mm socket to disconnect the negative battery cable.
• Position the cable so it can’t spring back to the terminal.

Step 3: Raise and support the vehicle

• Use a floor jack to lift the rear of your Suburban at the proper lift point.
• Set it down securely on jack stands.
• Place a drain pan under the tank area for small spills.

Step 4: Support the fuel tank

• Position a transmission jack under the fuel tank.
• Use a piece of wood (flat board) between the jack and tank to spread the load.
• Raise the jack until it just supports the tank (do not lift the vehicle).

Step 5: Disconnect filler neck and vent connections

• Use a flat-blade screwdriver to loosen hose clamps at the tank end (filler/vent hoses).
• Twist the hoses gently to break them loose, then pull them off. Don’t pry hard—plastic fittings crack.

Step 6: Lower the tank slightly to access lines and wiring

• Use a 13mm socket or 15mm socket (varies by hardware) to remove the fuel tank strap bolts.
• Lower the transmission jack slowly just enough to reach the top connections.
• Torque on install: Fuel tank strap bolts: 25 Nm (18 ft-lbs)

Step 7: Disconnect the electrical connector and fuel lines

• Unplug the fuel pump module electrical connector by hand (press the tab, then pull).
• Use the fuel line quick-disconnect tool set (specialty) to disconnect the fuel supply/EVAP lines.
• Have shop rags ready—some fuel will drip.
• If a connector uses a plastic retainer, use a flat-blade screwdriver gently to release it.

Step 8: Fully lower and remove the fuel tank

• Double-check that all hoses, lines, and wiring are free.
• Lower the transmission jack slowly and pull the tank out from under the vehicle.

Step 9: Clean the area around the fuel pump module

• Use shop rags and a non-sparking plastic scraper to clean dirt off the top of the tank.
• Use a paint marker to mark the module orientation before removal.

Step 10: Remove the lock ring and fuel pump module

• Use the fuel pump lock ring removal tool (specialty) to rotate the lock ring counterclockwise and remove it.
• If needed, use a brass drift punch and small mallet to tap the ring (brass reduces spark risk).
• Lift the module out slowly, tilting as needed to clear the float arm without bending it.
• Remove the old tank seal (O-ring) by hand.

Step 11: Install the new seal and new fuel pump module

• Install the new tank seal (O-ring) into the groove on the tank opening.
• Apply a very light film of clean fuel to the seal with a gloved finger so it doesn’t pinch.
• Lower the new module into the tank in the same orientation as your mark.
• Install the lock ring and tighten it using the lock ring removal tool (specialty) until fully seated/locked.

Step 12: Reinstall the fuel tank

• Place the tank back on the transmission jack and roll it under the vehicle.
• Raise the tank partway, then reconnect all fuel/EVAP lines using the quick-disconnect tools (specialty) as needed.
• Reconnect the electrical connector and apply a small amount of dielectric grease to the connector seal.
• Raise the tank fully and reinstall the straps using a 13mm socket or 15mm socket.
• Torque: Fuel tank strap bolts: 25 Nm (18 ft-lbs)
• Reconnect filler/vent hoses and tighten clamps with a flat-blade screwdriver.

Step 13: Restore power and prime the system

• Reconnect the negative battery cable using a 10mm socket.
• Torque: Battery terminal: 15 Nm (11 ft-lbs)
• Turn the key to ON (engine off) for 5 seconds, then OFF for 10 seconds.
• Repeat this key-cycle 3–4 times to prime the fuel system.
• Start the engine and let it idle.

---

✅ After Repair

• Inspect for leaks at the tank lines and module area while the engine is idling.
• Test drive for 10–15 minutes, then re-check for any fuel smell or seepage.
• If the check engine light comes on, you may need a scan for EVAP-related codes caused by a loose connector/line.

---

💰 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 3-5 hours.

---

🎯 Ready to get started?

HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.