The Gladiator JT's 3.6L Pentastar runs a fuel filter that's part of the in-tank fuel pump module — not a traditional in-line filter you'll find under the hood. Service intervals and access are different from older Jeeps.
Most JT owners come from older Wrangler or Cherokee ownership where a replaceable in-line filter was a routine item. The JT changed this. The 3.6L Pentastar uses a strainer integrated into the fuel pump module that sits inside the tank. Stellantis rates it as "lifetime" — meaning they intend it to go the life of the pump module, not that it never needs attention. In practice, this means you're not doing an annual filter swap; you're watching for symptoms that indicate a clogged strainer or degraded pump.
The only physical filter most JT owners will service is the fuel pump strainer/sock at module replacement time, or when symptoms indicate restriction: hard starts when hot, sputtering at wide-open throttle, a lean fuel trim code (P0171, P0174), or reduced power under load.
**Fuel safety — mandatory:** Depressurize the fuel system before any fuel line work. Locate the fuel pump fuse in the power distribution center under the hood, remove it, then crank the engine until it stalls (this purges line pressure). Work in a ventilated space with no open flames or ignition sources within 20 feet.
Before replacing anything, confirm fuel system pressure is actually low. A fuel pressure gauge (Schrader valve test port access via the fuel rail — check service manual location for the JT's 3.6L) should read 49–51 PSI at idle and hold pressure for 10+ minutes after shutdown. A reading below 45 PSI or pressure drop under load points to the pump/strainer, not a sensor issue.
1. Relieve system pressure via the fuse method above.
2. Remove the rear seat cushion and fold back the cargo area trim panel to access the fuel pump module access cover (center of the floor, beneath a plastic trim piece held by screws).
3. Disconnect the negative battery terminal before disconnecting any fuel or electrical connections at the module.
4. Use a fuel pump lock ring removal tool (or improvised spanner) to turn the lock ring counterclockwise. The JT uses a plastic lock ring — do not use an impact wrench. Hand effort only.
5. Lift the module straight up slowly — the float arm is long and will catch if you tip the module sideways. Drain residual fuel into a catch container.
6. Inspect the strainer/sock on the bottom of the module assembly. A grey/brown sock with visible debris is clogged. A clean replacement strainer is usually included with any aftermarket pump kit.
7. Install in reverse. New O-ring required at the module flange — do not reuse the old one.
8. Reinstall the lock ring and torque to 40 ft-lbs with a lock ring tool. Reinstall the pump fuse, turn the key to ON (do not crank) three times to prime the system, then start.
Mopar OEM fuel pump strainer (replacement sock only): ~$25–35. If the pump is otherwise functional, this is the minimum intervention.
Full fuel pump module replacement (OEM): ~$200–350. The pump and strainer are sold as an assembly — if the pump is marginal, replace the whole unit rather than the sock.
Full module replacement (aftermarket, Spectra Premium or Delphi): ~$120–200. Both are acceptable OEM-equivalent suppliers for this application.
Shop labor for fuel pump module replacement: $250–400. Access through the floor vs. dropping the tank is the JT's time-saver — it brings this job within reasonable DIY range. A shop will charge for the time savings they don't actually get.
| Part | Vendor | Est. price |
|---|---|---|
| Mopar OEM Fuel Filter for JT (Part #68439719AA) | Mopar | ~$38 |
| FRAM G12 In-Line Fuel Filter (compatible) | FRAM | ~$18 |
Written and maintained by an AZ wheeler and driveway wrencher. Always cross-reference your factory service manual — modifications affect vehicle safety and warranty. Work at your own risk.