🔧 IS - Fuel Pump Replacement

The fuel pump on your IS lives inside the fuel tank as part of an in-tank pump/module. This job is mostly about working cleanly, safely relieving fuel pressure, and resealing everything so you don’t get fuel smells or leaks.

Difficulty Level: Intermediate | Estimated Time: 2-4 hours

Assumption: your IS has an in-tank pump module accessed under the rear seat.

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⚠️ Safety & Precautions

• ⚠️ Work outside or in a well-ventilated area; fuel vapors are flammable.
• ⚠️ No smoking, no sparks, no drop lights with hot bulbs; use an LED work light.
• ⚠️ Relieve fuel pressure before disconnecting lines to prevent spray.
• ⚠️ Disconnect the negative battery cable to reduce spark risk.
• ⚠️ Keep a Class B fire extinguisher nearby.
• ⚠️ Wipe spills immediately and dispose of fuel-soaked rags safely.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 3/8" drive ratchet
• 3/8" drive torque wrench (in-lb or low Nm capable)
• Flat trim removal tool
• Small pick tool
• Needle-nose pliers
• Fuel line disconnect tool set
• Brass punch set
• Small hammer
• Shop towels
• Catch pan
• Marker or paint pen
• Nitrile gloves
• Safety glasses
• LED work light

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• In-tank fuel pump (or complete fuel pump module) - Qty: 1
• Fuel pump module tank seal O-ring/gasket - Qty: 1
• Fuel line retaining clip(s) - Qty: 1-2

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📋 Before You Begin

• Park on level ground, set the parking brake, and keep the driver window down.
• Remove loose items from the back seat area and vacuum dirt around the access area.
• Relieve fuel pressure (steps below) before opening any fuel connection.
• Disconnect the negative battery cable using a 10mm socket and tighten on install to Torque to 5 Nm (44 in-lbs).

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Relieve fuel pressure

• Open the hood and remove the engine room fuse/relay box cover by hand.
• Use needle-nose pliers to remove the fuel pump fuse/relay (often labeled FP/EFI depending on layout).
• Start the engine and let it run until it stalls; crank 2-3 more seconds to bleed off remaining pressure.
• Turn ignition OFF and reinstall the fuse/relay later (don’t forget).

Step 2: Disconnect the battery

• Use a 10mm socket to disconnect the negative battery terminal and isolate it so it can’t spring back.
• Tip: wrap the terminal in a shop towel.

Step 3: Remove the rear seat cushion to access the service cover

• From the rear footwell area, use a flat trim removal tool to pop the rear seat cushion release points (usually near the front edge of the cushion).
• Lift the cushion up and out by hand and set it aside.

Step 4: Open the fuel pump access cover

• Locate the metal service cover over the fuel tank opening.
• Use a 10mm socket to remove the cover fasteners (if equipped), then lift the cover.
• Peel back any butyl sealant carefully using a flat trim removal tool and keep it clean for re-use if it’s in good shape.
• Blow/clean dirt away with shop towels (do not let dirt fall into the tank opening).

Step 5: Disconnect the electrical connector and fuel line(s)

• Unplug the pump/module electrical connector by hand; use a small pick tool only to gently lift the lock tab (a lock tab is a small plastic latch that prevents unplugging).
• Place a catch pan and shop towels under the fuel line connection.
• Disconnect the quick-connect fuel line using your fuel line disconnect tool set if needed; some connectors release by squeezing tabs—do not force or twist aggressively.
• Cap/cover the line end with a clean shop towel to keep dirt out.

Step 6: Mark the module orientation

• Use a marker or paint pen to mark the tank and the module top so you reinstall it in the same orientation.
• Tip: alignment prevents float/line misrouting.

Step 7: Remove the fuel pump retaining ring

• The module is usually held by a large plastic/metal retaining lock ring (a big threaded ring that clamps the module to the tank).
• Use a brass punch set and small hammer to tap the ring counterclockwise to loosen (brass reduces spark risk).
• Lift the lock ring off and set it aside cleanly.

Step 8: Remove the fuel pump module

• Carefully lift the module straight up; angle it as needed to clear the fuel level float (the float is the small “bobber” arm that measures fuel level).
• Let fuel drain into the tank opening briefly, then move the module into a catch pan.
• Remove and discard the old tank seal O-ring/gasket.

Step 9: Swap the pump (if you’re not replacing the whole module)

• If you purchased a complete module, skip this step.
• On a bench, use the small pick tool and needle-nose pliers to release the internal clips/hoses and transfer the pump as required.
• Keep the strainer/filters oriented exactly like the original.

Step 10: Install the new seal and reinstall the module

• Install the new tank seal O-ring/gasket onto the tank opening or module (match original placement).
• Lower the module into the tank carefully, guiding the float in without bending it.
• Align your paint marks so the module sits exactly as before.

Step 11: Reinstall and tighten the retaining ring

• Install the lock ring and hand-start it to avoid cross-threading.
• Use the brass punch set and small hammer to tap it clockwise until fully seated and aligned with the factory stops/marks.
• Torque: If your lock ring has a published spec for your exact ring/tool, tighten to Torque to OEM specification; otherwise tighten to the seated/aligned position (do not over-tighten and crack the ring).

Step 12: Reconnect the fuel line(s) and electrical connector

• Reconnect the fuel line until it clicks; gently pull back by hand to confirm it’s locked.
• Install any new fuel line retaining clip(s) if equipped.
• Reconnect the electrical connector until it clicks.

Step 13: Reinstall the service cover and rear seat

• Reinstall the service cover using a 10mm socket; Torque to 3 Nm (27 in-lbs) if small screws/bolts are used.
• Reinstall the rear seat cushion by lining up the rear tabs and pushing down firmly until it snaps into place.

Step 14: Restore power and prime the fuel system

• Reconnect the negative battery terminal using a 10mm socket; Torque to 5 Nm (44 in-lbs).
• Reinstall the fuel pump fuse/relay using needle-nose pliers if you removed it.
• Cycle ignition ON (engine OFF) for 5 seconds, then OFF for 5 seconds; repeat 3 times to prime the system.

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✅ After Repair

• Start the engine and let it idle for 2-3 minutes.
• Check for leaks at the quick-connect line and around the lock ring area (use a bright LED work light).
• If you smell fuel inside the cabin, stop and re-check the seal seating and lock ring engagement.
• Take a short test drive, then re-check for any seepage again.

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💰 DIY vs Shop Cost

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

DIY Cost: $200-$650 (parts only)

You Save: $500-$750 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 2-4 hours.

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🎯 Ready to get started?

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