HowToMechanic

How to Replace the Fuel Pump on a 2008 Jeep Liberty — 3.7L V6, 2WD

Fuel pump replacement on a 2008 Jeep Liberty 3.7L V6 2WD starts with diagnosis. Long cranking, a crank/no-start, stalling, poor acceleration or an inaccurate fuel gauge can have different causes. P1128 means closed-loop fueling was not achieved on Bank 1; P0461 concerns fuel-level sensor 1 performance. Neither code nor these symptoms proves the pump has failed. Check electrical supply, fuel delivery, sender operation and the other causes identified by the diagnostic procedure before buying a module.

Application and repair overview

This guide covers the 2008 Liberty 3.7L gasoline V6, VIN engine character K, with 2WD. The documented access route removes the fuel tank and the rear propeller shaft. It requires fuel recovery, a workshop hoist and controlled tank support. The replacement combines pumping, pressure regulation and level-sending components, but a new assembly cannot repair damaged wiring, restricted lines or an engine-control fault.

DIY skill level

Advanced: pressurized fuel, tank handling and driveshaft removal.

Estimated repair time

4–7 hours after diagnosis; corrosion or damaged fittings can add time.

Estimated parts budget

$100–$240 for the module and routine materials; planning estimate, excluding tools and facilities.

Fuel-service safety: Work with a cool vehicle and good ventilation, away from smoking, flames, heaters and spark-producing equipment. Wear splash goggles and gasoline-compatible gloves; keep an appropriate extinguisher ready. Fuel remains pressurized after shutdown. The pressure-release sequence below requires the engine to run: if it cannot run, stop before opening any fuel connection and arrange professional depressurization. Also stop for inadequate lifting or recovery equipment, severe corrosion, damaged tank supports or a mismatched fitting. Never work under a vehicle supported only by a jack.

Featured replacement: A-Premium FP0126C

Product: A-Premium electric fuel-pump module assembly with sending unit. ASIN: B075JDQGHV. Part number: FP0126C, including the C suffix. Quantity: one assembly. The selected product identifies an included pump, sender, float, strainer, fuel-pressure regulator and sealing ring; a pressure sensor is not included. Check the delivered seal and float arrangement before starting. Inspect the vehicle’s retaining ring separately; new retaining hardware is not established as part of this package.

View A-Premium fuel-pump module

Reference numbers include 68004095AA, 68004095AB, RL004095AB, E7219M, F3220A, FG0888, P76491M and SP7041M. The manufacturer’s related FP0126 catalog shares these references, while this selected listing identifies FP0126C. Confirm the VIN, original module, connectors, outlets and sender configuration with the supplier. Do not order by appearance or by the model name alone.

Vehicle compatibility

Vehicle Catalog years Engine and fuel Configuration and procedure coverage
Jeep Liberty 2008–2012 3.7L V6 gasoline The detailed procedure below covers 2008 2WD. Verify the exact VIN and original module; use separate service information for 4WD and other years.
Dodge Nitro 2007–2011 3.7L V6 gasoline Part application only; Nitro access, fasteners and service details are outside this procedure.
Dodge Nitro 2007–2011 4.0L V6 gasoline Part application only; confirm the actual engine, connectors and OE reference before buying.

The selected fitment information does not state a transmission or trim restriction. That does not establish compatibility with an unlisted configuration, diesel engine or modified fuel system. The shared Mopar 68004095AA reference catalog includes 2008 Liberty 3.7L Sport and Limited in 2WD and 4WD; the steps here remain limited to 2WD.

Symptoms and checks before replacement

Check actual fuel level, battery condition and normal cranking; save codes and freeze-frame data. Inspect accessible fuel lines, connectors and grounds. The Jeep owner guide identifies M25, a yellow 20A mini fuse, for the fuel pump in the underhood TIPM near the battery. Check its cover label, use the specified rating and investigate a repeatedly blown fuse. A start followed by shutdown after about two seconds with a security indication can involve the Sentry Key system.

P1128 can involve fuel pressure, oxygen-sensor operation, intake leaks, temperature sensing or other engine conditions. P0461 calls for checks of tank damage, float movement, sender wiring and connections. A pump replacement is not automatically the remedy for either code. Follow the P1128 diagnostic path and P0461 sender checks.

Measure pressure using the defined diagnostic setup

The P1128 procedure first tests pressure at the rail. If that reading is low, its supply-line check uses 5/16-inch adapter 6539 between the disconnected line and pump module, with the gauge on the adapter’s T-fitting. With ignition on, engine off, command the scan tool’s ASD Fuel System test: the stated target is 407 ±34 kPa (59 ±5 psi). This is the criterion for that commanded test; it is not an ordinary idle or key-cycling specification.

Before attaching an adapter, complete the prescribed pressure release below and isolate the negative battery lead with the pump fuse removed. Secure every rail/module connection and gauge hose before restoring battery power and the fuse for testing. After a reading, stop ASD actuation and switch ignition off. Following the tester’s instructions, discharge through its controlled bleed hose into an approved gasoline receiver until the gauge reads zero; remove the pump fuse and isolate the battery before disconnecting adapters. Contain residual hose fuel and close all connections. If diagnosis re-pressurizes the system, repeat the documented pressure-release/isolation sequence before tank work, with the same nonrunning stop.

Correct pressure at the module after low rail pressure directs attention to the supply line. Low module pressure still requires strainer, connector and pump-circuit checks; excessive pressure points toward regulation. Have an equipped technician perform this diagnosis if the adapters, safe release method or scan function are unavailable. A basic reader cannot perform the command.

Tools, parts and supplies

This equipment list supports the workshop-hoist route. Match socket heads, coupling retainers and every pressure-test connection to the actual vehicle. Obtain the complete diagnostic and recovery assemblies before work; a gauge or container alone is not a complete fuel-service system.

Tool or Supply Exact Product Product Link Purpose and Selection Check
Hand sockets, ratchets and extensions DEWALT DWMT75049 192-Piece SAE and Metric Mechanics Tool Set View socket and ratchet set Includes 1/4-, 3/8- and 1/2-inch drives, metric six-point sockets and extensions. Match actual fastener heads; obtain missing sizes. Use hand tools near fuel.
Small-fastener torque wrench EPAuto ST-013-1 1/4-Inch Drive Torque Wrench, 20–200 in-lb View inch-pound torque wrench Use matching 1/4-inch sockets. The 2.26–22.6 N·m range covers the 3 N·m filler-hose clamp at tank and 5 N·m battery clamp; use the metric scale.
Tank and propshaft torque wrench EPAuto ST-010-1 1/2-Inch Drive Torque Wrench, 10–150 ft-lb View foot-pound torque wrench Use matching 1/2-inch sockets. Covers tank hardware at 61 N·m (45 ft-lb) and propshaft flanges at 108 N·m (80 ft-lb); prepare threads as specified.
Hand driver for the lock-ring tool TEKTON SBH00218 1/2-Inch Drive × 18-Inch Breaker Bar View 1/2-inch breaker bar Hand-drive tool 9340/9340A counterclockwise to remove the ring, clockwise until all seven notches engage. Keep the tool fully seated.
Propshaft alignment marker Sharpie 1782041 Oil-Based Paint Markers, Medium Point, White, 2-Count View white paint markers Match-mark shaft and flange at both ends; restore both positions. Mark clean external metal without gouging. One marker suffices; package contains two.
Propshaft bolt thread adhesive Genuine Mopar 4318031 Lock & Seal Adhesive, 6 mL View Mopar Lock & Seal Clean propshaft bolt threads and apply this adhesive according to its instructions. Tighten bolts at both flanges to 108 N·m (80 ft-lb).
Clean fuel-coupling assembly oil Pennzoil 550035091 5W-30 Motor Oil, 1 Quart View coupling assembly oil Conditional purchase: existing uncontaminated engine oil suffices. Apply a light film to coupling surfaces as prescribed; do not substitute it for bolt adhesive or add unprescribed gasket lubricant.
Optional generic code reader Autel AL319 OBD-II Code Reader View basic code reader Optional for generic codes and freeze-frame data. It cannot command ASD Fuel System; the separate bidirectional diagnostic setup is required.
Electrical diagnostic meter Innova 3320 Auto-Ranging Digital Multimeter View diagnostic multimeter Optional for electrical diagnosis with the exact wiring diagram and protected probes. Test resistance only on unpowered circuits; never place a current input across battery power.
Wheel chocks for grounded preparation MaxxHaul 70472 Solid Rubber Wheel Chocks, 2-Pack View rubber wheel chocks Match the two 8 × 4 × 6-inch chocks to grounded tires and surface; add chocks where needed. Secure the hoist before selecting Neutral.
Chemical-splash goggles 3M 91252H1-DC-10 Chemical Splash Goggles View splash goggles Wear properly fitted, indirect-vent splash goggles during pressure release, fuel disconnection and tank handling. They protect eyes, not breathing.
Fuel-compatible chemical gloves Honeywell North SilverShield SSG/7 Gloves, Size 7, 10-Count Package View size-7 barrier gloves Confirm size and resistance for the actual gasoline blend/contact duration. Use the required mechanical overgloves for handling; replace contaminated or damaged gloves.
Class B-capable fire extinguisher First Alert HOME1 / FE1A10GR Rechargeable Fire Extinguisher, 1-Pack View fire extinguisher Keep the charged 1-A:10-B:C extinguisher accessible with a clear escape route. Follow its label and your training; control ignition sources.
Gauge-bleed gasoline receiver Eagle UI50FS 5-Gallon Gasoline Safety Can with F-15 Funnel View gasoline safety can For controlled gauge bleed and small residual quantities. Match hose/opening instructions without defeating the flame arrester or lid. This can cannot hold a full 19.5-gallon tank.
Drained-tank support attachment OTC 1758 Fuel Tank Handler View tank-support attachment Mount on the compatible TJH10 with approved hardware. Confirm sound tank contact; center, restrain and keep the drained tank level.
High-lift jack for the tank handler OTC TJH10 1,000 lb High-Lift Transmission Jack View high-lift support jack Use with the 1758 beneath a locked hoist on a hard, level floor. Check its 35–71⅝-inch height range plus attachment; lower fully before moving.
Correct module lock-ring wrench Mopar/Miller 9340, superseded by Mopar 9340A Source by specification Confirm ring/tool fit; hand-drive with the listed 1/2-inch breaker bar. Install clockwise until all seven notches engage.
Complete Chrysler fuel-pressure test equipment Compatible fuel-pressure gauge set with rail connection and 5/16-inch inline adapter 6539/6539A Source by specification Provide a gasoline-rated 0–100 psi gauge, matched rail connection, rated hoses/couplers, controlled bleed and receiver. Use 6539 at the module only after low rail pressure. Install after initial pressure release.
Chrysler bidirectional diagnostic system Licensed wiTECH 2.0 with genuine Mopar Diagnostic Pod and complete supported connection setup Source by specification Provide active subscription, registered interface, compatible computer/browser, network and vehicle/USB connections. Confirm the 2008 Liberty ASD Fuel System command before opening fuel lines; needed for pressure and final leak checks.
Vehicle support and working clearance Properly rated workshop hoist with correct Jeep frame/subframe contact pads and mechanical locks Source by specification Follow the exact lift map. Confirm pad contact, clearance for the TJH10/1758 and stability as tank/shaft weight changes. Secure before Neutral; avoid prohibited lifting points.
Bulk gasoline withdrawal and storage JohnDow Fuel Chief FC-25GC 25-Gallon Gas Caddy, with matched gasoline withdrawal hose/accessories Source by specification Use the two-way hand pump, grounded hose and ground clamp. Match the withdrawal end to the rear tank opening without damaging its flapper. Allow up to 19.5 US gallons within caddy fill limits.
Fuel-coupling release tool and retainers Snap-On FIH9055-1 or verified equivalent for the rail latch-clip fitting; tools for actual tank retainers Source by specification Identify retainers first. Release the rail’s external latch and internal fingers with the correct tool; use each tank coupling’s method. Obtain new tabs and replace damaged/nonserviceable assemblies.
Correct new module sealing gasket Matching new gasket supplied with FP0126C, or exact VIN-matched replacement Source by specification A new seal is mandatory. Check the supplied green ring against the tank and module; obtain the correct replacement if needed. Add no unprescribed RTV, sealant or lubricant.
Support while removing the propshaft Suitable padded support/restraint or a second trained person Source by specification Support the shaft as both flanges are released; protect joints and boots and prevent a free end dropping. Maintain support until aligned reattachment.
Gasoline spill absorbents and waste container Fuel-compatible static-dissipative absorbents, such as PIG MAT214, and suitable closed waste container Source by specification Arrange gasoline-compatible absorbents before disconnection. Capture small spills and put contaminated material in a suitable closed waste container; follow disposal instructions.
Clean sealing surfaces and temporary port protection Clean lint-free wiping material and fuel-compatible caps/plugs sized to the opened fittings Source by specification Clean the flange before opening; use lint-free material and correctly sized fuel-compatible caps. Keep debris out and have required new retainers or clamps ready.

DIY versus professional cost

DIY planning allowance: $80–$180 for an aftermarket module plus $20–$60 for matched sealing/assembly materials and consumables gives roughly $100–$240, assuming suitable tools and workshop facilities are already available. Replacement damaged hardware is extra. Basic hand and diagnostic tools may add $150–$400; hoist access, tank handling, fuel recovery and the required scan function are additional. These are planning estimates, not live Amazon prices.

RepairPal’s 2008 Liberty estimate, updated September 3, 2026, is $1,751–$1,951 total, including labor of $366–$537 and parts of $1,385–$1,414. It excludes taxes, fees, location differences and related repairs. This model-year benchmark is not a quote for FP0126C or a promise that a local shop will use a customer-supplied module. Compare itemized quotes for the actual part and repair scope. View the 2008 Liberty cost estimate.

Tank removal and fuel-pump module replacement

1. Complete diagnosis and release fuel pressure

Park on a level surface, apply the parking brake and chock the wheels. Save diagnostic data first. On a vehicle that can run, switch ignition off, remove the fuel cap and remove the fuel-pump fuse identified on the TIPM cover. Run the engine until it stalls, then attempt restarting until it will no longer run; turn ignition off. Disconnect and isolate the negative battery cable before opening a fuel coupling. Position absorbent material beneath the rail quick-connect and release its latch clip and use the correctly matched disconnect tool to release the internal fingers. Contain residual fuel and protect the open connection from dirt. Factory pressure-release procedure.

If the engine initially will not run, do not open the rail or tank connection using this sequence. Have a qualified fuel-service technician depressurize the system before proceeding. Removing the cap, pulling a fuse or cranking a nonrunning engine does not establish zero pressure. Allow hot components to cool and keep all ignition sources away.

2. Secure the vehicle and recover the fuel

Have a trained operator position the hoist at the correct frame/subframe-rail contact points, check stability and engage its locks. The factory lift-point map identifies the locations. Do not lift by the fuel tank, driveshaft, body sill, steering components or engine/transmission pans. Account for balance changes as parts are removed.

After pressure release, clean and disconnect the two quick-connects at the tank’s front. Remove the rear filler hose and clamp. Recover fuel through the filler-hose opening using gasoline-rated withdrawal equipment; protect the small internal flapper and do not force the hose. Provide approved recovery capacity for the actual fuel load—the nominal tank capacity is 19.5 US gallons (73.8 L). A single five-gallon can is insufficient for a full tank. Disconnect the rear vapor lines and record their routing.

3. Mark and remove the rear propeller shaft

With the vehicle safely secured on the hoist, use Neutral as required by the factory shaft procedure. Mark the relationship between shaft and axle flanges, and between shaft and transmission flanges. Support the shaft while removing its bolts at both ends, then remove it without straining the joints. Keep the matching marks visible for reassembly. Rear propeller-shaft removal.

4. Support and lower the tank

Secure the drained tank level on the compatible tank handler and hydraulic support. Loosen the two support-bracket nuts, remove the bracket bolt, then remove the tank mounting bolts at both sides. Lower only far enough to reach the module electrical connector, disconnect it and check that every line is free. Continue lowering under control. Factory tank-removal sequence.

5. Open the module and inspect the assembly

Clean the tank around the module before opening it. Record the module’s rotational position and alignment arrow. Engage tool 9340 in the retaining ring’s outer notches and use a 1/2-inch drive breaker bar to turn counterclockwise. Control the spring-loaded module as the ring releases. Lift it out carefully without bending the float arm.

Check the tank for contamination, distortion and damage, and inspect the ring and retaining features. Resolve contamination before fitting the replacement. Compare the new module’s connections, seal, height and sender arrangement with the removed assembly. If its float arm arrives separately, obtain and follow the supplier’s FP0126C attachment instructions. Do not proceed without secure attachment and free travel; do not improvise its bend or orientation.

6. Install a new seal and align the module

The factory requires a new rubber module seal whenever the module is serviced. Check that the supplied sealing ring matches; keep the mating surfaces clean and follow its assembly instructions without adding unapproved sealant. Lower the module into the opening and position the ring. Rotate the module so its embossed arrow points to the tank’s center alignment mark, preventing float contact with the tank wall.

Using tool 9340 and the 1/2-inch breaker bar, turn the retaining ring clockwise until all seven notches engage. The procedure specifies complete engagement rather than a numerical ring torque. Do not substitute a hammer and punch or tighten until the plastic distorts. Module sealing and alignment procedure.

7. Refit the tank, shaft and connections

Raise the tank enough to reconnect the module harness, then continue until it is correctly seated against the body. Keep wiring and hoses clear. Tighten the tank’s side mounting bolts, both support-bracket nuts and the bracket bolt to 61 N·m (45 ft-lb). Remove tank support only after the tank is secured. Tank installation and fasteners.

Reinstall the shaft with both flange marks aligned. Clean the flange bolts and apply Mopar Lock & Seal Adhesive or an approved equivalent to their threads; tighten bolts at both ends to 108 N·m (80 ft-lb). Reconnect the rear vapor lines and filler hose; tighten the filler-hose clamp at the tank to 3 N·m. Propeller-shaft installation.

Inspect and reconnect the front fuel lines and the rail fitting opened for pressure release. The factory quick-connect procedure calls for clean engine oil on the connection surfaces, full insertion to the stop and a click, followed by the specified 15–30 lbf pull check. Refit safety clips; single-tab fittings require a new tab. If a clip will not seat, check the connection again. Replace a damaged line assembly when its internal fitting components are not serviceable. Quick-connect types and reassembly.

8. Restore the system and check for leaks

Confirm all disturbed connections and fasteners are secured, clear tools and contaminated materials, and lower the vehicle safely. Add clean gasoline with approved equipment and tighten the cap until it clicks; do not top off. Restore the correct fuel-pump fuse and latch the TIPM cover. Once spills and vapors have cleared, reconnect the negative battery clamp to 5 N·m (45 in-lb).

Secure the parked vehicle with the parking brake and wheel chocks, and select Park where equipped or Neutral before any engine start. With ignition on and engine off, pressurize the closed system using the documented ASD Fuel System command. Stop actuation and inspect all disturbed fuel connections before starting. Stop for a leak or fuel odor. After that inspection passes, start and recheck disturbed joints for leaks while idling; check fuel-level indication and returning codes. Clear only repair-induced or resolved codes after recording them. Battery disconnection can leave emissions monitors incomplete. Road-test after safe reassembly, then reinspect for leakage and driveline vibration.

Component illustration

Generic electric fuel-pump assembly with a strainer and fuel-level sender float
Generic educational fuel-pump and sender example showing a different part and vehicle. Photo: Austin Davis, Wikimedia Commons; reuse permitted.

Common mistakes

  • Treating P1128 or P0461 as proof of a failed pump without following the relevant diagnostic branch.
  • Assuming a no-start, removed fuse or open cap means the fuel lines are depressurized.
  • Forgetting either propshaft alignment mark or omitting the prescribed bolt adhesive.
  • Reusing the module gasket, misaligning the arrow or stopping before all seven ring notches engage.
  • Applying module-end pressure results to the rail without checking the line between them.
  • Using the wrong torque units, forcing brittle retainers or driving before static leak checks pass.

Frequently asked questions

Does this procedure cover every vehicle in the product table?

No. The part is listed for the specified Liberty and Nitro engines, but these steps and fasteners cover the 2008 Liberty 3.7L gasoline 2WD. Use the exact service information for other years, engines or drivetrains.

Can a basic OBD-II reader complete the pressure diagnosis?

It can read generic codes and freeze-frame data. The specified test needs the vehicle’s ASD Fuel System actuator function and the correct pressure equipment; confirm that capability or use an equipped technician.

Must the tank and rear driveshaft come out?

Yes, the documented 2008 2WD procedure removes both. It does not provide a cabin access-panel route. Do not cut the body or omit support to create a shortcut.

Can I reuse the old sealing ring?

No. The module procedure requires a new rubber gasket whenever it is serviced. Check the supplied seal before installation and replace damaged or mismatched parts.

What if the Jeep cannot run long enough to release pressure?

Keep the fuel system closed and arrange professional depressurization appropriate to the vehicle. Do not connect an inline test adapter to a pressurized line as an improvised release method.

Sources and further reading

Jeep factory workshop information below is reproduced by Operation CHARM. The owner guide is hosted by Mopar.