Mopar Fuel Tanks

When Your Fuel Tank Is Leaking, Rusted, or Damaged

The short answer: if your tank is seeping fuel, rusted through at the seams or straps, dented from road debris, or triggering evaporative system codes it cannot pass, replace it with a genuine Mopar fuel tank designed for your vehicle’s exact capacity, mounting points, filler neck, and EVAP connections. Mopar Wholesale Store sells OEM tanks, straps, filler necks, and related hardware for Chrysler, Dodge, Jeep, and Ram vehicles at wholesale-level prices, with VIN lookup for guaranteed fitment and shipping nationwide.

A fuel tank rarely gets attention until something goes wrong, and when it does, the stakes are high. Gasoline and diesel are flammable, fuel vapor is regulated, and the tank is tied into your fuel pump, your emissions system, and your vehicle’s crash protection. This guide covers how the system fits together, how to tell when a tank is done, and how to decide whether to tackle the job yourself.

Warning Signs to Take Seriously

Some tank problems are obvious; others hide behind a check engine light. Here is what to look and smell for.

What you notice	What it may mean	How urgent
Fuel smell near the rear of the vehicle	Seeping seam, cracked filler neck, loose hose, or vapor leak	High: inspect before driving further
Wet spots or drips under the tank	Active liquid leak from the tank, fittings, or module seal	Stop driving; fire risk
EVAP leak codes that keep coming back	Cracked vapor line, damaged filler neck, bad seal, or tank leak	Moderate: repair before inspection
Fuel gauge reads wrong or erratic	Failing sending unit, or a dented tank interfering with the float	Low to moderate
Pump runs loud or vehicle stalls on low fuel	Debris or rust inside the tank clogging the pump strainer	Moderate
Hard to fill; pump nozzle keeps clicking off	Blocked vent line or filler neck problem	Moderate
Visible rust flakes on straps or tank	Corrosion weakening the mounting or the tank shell	High if straps are compromised
Deep dent or gouge after hitting debris	Possible reduced capacity, weakened shell, or damaged module	Inspect promptly

A tank strap that rusts through is a real hazard. If a strap fails, the tank can drop and drag, which can rupture lines. Never ignore heavily corroded straps or brackets.

How a Modern Fuel Tank System Works

Today’s fuel tank is far more than a metal box. Most current Mopar vehicles use a molded high-density plastic tank, while many older vehicles and some applications use steel. The tank is shaped to fit tightly around the frame, exhaust, driveline, and suspension, which is why tank shapes differ so much between models and even between two- and four-wheel-drive versions of the same truck.

The parts that make up the system

Fuel enters through the filler neck, which routes from the fuel door down to the tank and includes a check valve or capless design on many newer vehicles. Inside, a fuel pump module, usually accessed through a large locking ring on top of the tank, combines the electric pump, a strainer, the fuel level sending unit, and on many vehicles a reservoir that keeps the pickup submerged during cornering. Straps hold the tank against its mounts, and on many vehicles a heat shield protects it from the exhaust.

The EVAP side

Fuel constantly gives off vapor. The evaporative emission (EVAP) system captures that vapor, stores it in a charcoal canister, and lets the engine burn it later. Vapor lines, a vent valve, a purge valve, and in many cases a leak detection pump or pressure sensor connect to the tank. Because the EVAP system tests itself for leaks, even a tiny crack in a tank fitting or filler neck can turn on the check engine light.

What This Category Includes

• Complete fuel tanks for gasoline and diesel applications
• Fuel tank straps, brackets, and mounting bolts
• Filler necks, filler tubes, and capless filler assemblies
• Fuel caps and tethers on applicable vehicles
• Fuel tank heat shields and splash shields
• Fuel tank skid plates for Jeep and truck applications
• Pump module lock rings and tank seals
• EVAP vent hoses, vapor lines, and related connectors
• Fuel level sending units on applicable models

When the tank comes out, it is the ideal time to evaluate the pump. Browse genuine Mopar fuel pumps and modules so you only drop the tank once.

Plan by How You Use Your Vehicle

Commuters and family vehicles

For most cars and minivans, tank trouble comes from age: road salt attacking straps and steel tanks, EVAP fittings that crack, and filler necks that rust where they bend near the wheel well. If you live where winter roads are salted, inspect straps and the filler neck each year when the vehicle is on a lift for tire service.

Towing and work trucks

Trucks carry larger tanks and frequently haul heavy loads on rough job sites, which adds vibration and debris impacts. A tank that is dented or has a loose strap can rub through a line over time. Truck owners also tend to run tanks lower between fill-ups on long hauls, so a clean tank and a healthy pump matter. Pair a tank inspection with a hitch check from our towing parts.

Off-road Jeeps and trucks

Rocks, stumps, and ledges are the tank’s worst enemies. Many Jeep Wrangler and Gladiator models, along with off-road trims of other vehicles, use a fuel tank skid plate that shields the tank from impacts. If your skid plate is bent up into the tank, replace both before the next trail run. A dented tank may also leave the sending unit reading incorrectly.

Performance driving

High-output engines draw large volumes of fuel, and hard cornering sloshes fuel away from the pickup. The factory module reservoir is designed to handle that. Keep the tank above a low level during track days, and replace the module seal whenever the tank is serviced.

Fuel Tanks by Mopar Brand

Chrysler

Chrysler minivans and sedans like the Pacifica, Town & Country, and 300 most often need tank work because of EVAP leaks, rusted filler necks, or straps in salt-belt climates. The Pacifica Hybrid uses a tank and vapor system engineered for its plug-in hybrid design, so its parts are not interchangeable with the gasoline Pacifica. Always shop by VIN for these models.

Dodge

Dodge cars, the Durango, Journey, and Grand Caravan each use a unique tank. Performance Dodge models have high-flow fuel modules, so pay attention to the module seal and lock ring during any tank service, and match tank and module parts to your exact engine.

Jeep

Jeep tanks are designed around ground clearance and articulation. Wrangler and Gladiator models often have specific tanks and skid plates for two-door, four-door, and pickup bodies, and diesel or hybrid versions may use different tanks again. Trail damage is the most common reason Jeep owners shop this category, and many pair a new tank with other underbody protection from our exterior accessories.

Ram

Ram pickups offer different tank sizes depending on cab, bed, wheelbase, and engine, and some trucks were offered with an optional larger tank. Diesel Ram trucks also carry a separate diesel exhaust fluid tank on applicable model years, which is not the same part as the fuel tank. Use your VIN, and see our full Ram parts catalog for related hardware.

How to Choose the Correct Tank

Fuel tanks are among the most application-specific parts on a vehicle. A tank that is a fraction of an inch off can rub the frame, and the wrong EVAP fitting layout will set codes.

• Enter your VIN. This confirms body style, drivetrain, engine, and emissions equipment as built.
• Know your capacity. Some vehicles had more than one tank size available. Your owner’s manual or build sheet lists yours.
• Confirm the fuel type. Gasoline, flex-fuel, diesel, and hybrid applications can use different tanks and seals.
• Check drivetrain and wheelbase. Two- and four-wheel-drive versions of a truck often use different tanks.
• Match the filler system. Capped and capless filler necks are not interchangeable.
• Add the small parts. Straps, module seal, lock ring, and any heat shields should be ordered with the tank.

Genuine Mopar vs. Aftermarket Fuel Tanks

Consideration	Genuine Mopar	Aftermarket
Shape and clearance	Engineered to the exact chassis, exhaust, and driveline	May need trimming or shims; risk of contact
EVAP fittings	Match the factory vapor lines and leak test	Fitting layout may differ, causing codes
Material and permeation	Meets the vehicle’s original emissions design	Material specs not always disclosed
Crash and safety design	Part of the vehicle’s original engineering	Unknown testing
Module and sender fit	Accepts the factory pump module and lock ring	Lock ring or seal may fit poorly
Warranty	Mopar parts warranty	Varies by seller

A tank that almost fits is not a bargain. Leaks, gauge errors, and EVAP codes after an off-brand install often cost more to chase down than the original savings.

DIY or Professional? Making the Call

Replacing a fuel tank is one of the more demanding jobs an experienced DIYer can take on. You will need a way to safely lift and support the vehicle high enough to lower the tank, a transmission jack or tank support, line disconnect tools, and an approved container to hold fuel. We recommend a professional if any of the following apply:

• You cannot safely drain or store the fuel in the tank.
• The vehicle must be lifted higher than ramps or jack stands allow safely.
• Fasteners are heavily rusted and may require cutting or heat near the tank (never use heat or sparks near fuel).
• The vehicle is a hybrid with high-voltage components nearby.
• You smell fuel but cannot find the source.

Step-by-Step: Replacing a Fuel Tank

Safety note: fuel vapor is explosive. Work outdoors or in a very well-ventilated area, never near pilot lights, grinders, or drop lights with exposed bulbs. Disconnect the battery, keep a fuel-rated fire extinguisher within reach, wear eye protection and chemical-resistant gloves, and never smoke. Relieve fuel system pressure following your service information before opening any line. If you are unsure at any point, stop and have a professional finish the job.

1. Order the tank, straps, module seal, lock ring, and any shields by VIN. Have them on hand before you start.
2. Run the tank as low as practical, then relieve fuel pressure and disconnect the negative battery cable.
3. Drain remaining fuel into approved containers using a method recommended in your service information. Store it away from ignition sources.
4. Raise the vehicle and support it securely on jack stands rated for its weight. Never work under a vehicle supported only by a jack.
5. Remove the skid plate, heat shield, or spare tire if they block access.
6. Disconnect the filler neck and vent hoses at the tank, then label and disconnect the EVAP lines.
7. Support the tank with a transmission jack or tank cradle, then remove the strap bolts.
8. Lower the tank slightly and disconnect the fuel supply line and module electrical connector on top.
9. Lower the tank fully and move it to a ventilated work area.
10. Transfer or replace the pump module using a new seal and lock ring. Inspect the strainer for rust or debris.
11. Raise the new tank into place, reconnect the module, lines, and filler neck before fully tightening straps.
12. Install straps and tighten to the specification in your service information.
13. Reinstall shields and skid plates, reconnect the battery, add fuel, and cycle the key to pressurize.
14. Inspect every connection for leaks and fuel odor before starting. Start the engine and recheck.

Care and Maintenance for a Longer Tank Life

• Tighten the cap until it clicks on capped models; a loose cap is a common EVAP code trigger.
• Don’t top off after the pump clicks off. Overfilling can flood the charcoal canister with liquid fuel.
• Wash the underbody in winter to slow corrosion on straps, the filler neck, and steel tanks.
• Inspect skid plates after every hard trail run, and replace bent ones.
• Keep the fuel clean. Buy from reputable stations, and for diesels, drain water separators as directed.
• Store with care. For vehicles stored long term, follow your owner’s manual advice on fuel level and stabilizer.
• Address fuel smells right away. A small vapor leak can become a liquid leak.
• Replace brittle connections. Swap cracked filler and vent hoses with OEM hoses and clamps rather than taping them.

If contaminated fuel or rust from an old tank traveled forward, inspect the fuel injectors as well, since debris that passes the strainer can affect them. A clean intake path from your air cleaner assembly also helps the engine run cleanly once the new tank is in.

Key Takeaways

• Leaks, fuel odor, rust on straps, road damage, and recurring EVAP codes are the main reasons to replace a tank.
• Fuel tanks are highly application-specific; shop by VIN and confirm capacity, drivetrain, and filler type.
• Always replace the pump module seal and lock ring, and inspect the pump while the tank is out.
• Off-road Jeeps and trucks should inspect skid plates and replace bent ones.
• Fuel vapor is explosive; work in ventilated areas, away from sparks and heat.
• Choose a professional for hybrids, heavy rust, or any job you cannot do safely.

Frequently Asked Questions

Can a leaking fuel tank be patched?

Patch kits are sold, but they are generally not considered a lasting or safe repair for a fuel tank, especially plastic tanks or leaks at seams and fittings. Replacing the tank is the safer route.

Why does my check engine light come on after I fill up?

A loose or damaged fuel cap, a cracked filler neck, or a leaking EVAP fitting are common causes. Overfilling the tank can also affect the EVAP system. Start with the cap and inspect the filler neck.

Should I replace the fuel pump when I replace the tank?

It is not always required, but since the tank is already out, many owners replace an older pump to avoid dropping the tank again. At minimum, use a new module seal and lock ring.

My gauge reads wrong. Is it the tank?

Usually it is the sending unit or wiring, but a dented tank can bind the float arm. Inspect the tank for damage before replacing the sender.

Do I need a skid plate on my Jeep?

If you drive off-road, a skid plate is strongly recommended, and many trail-rated Jeep models include one from the factory. Replace it if it is bent toward the tank.

Is a plastic tank as durable as steel?

Modern molded plastic tanks resist rust and are designed for long service. They can still be damaged by impacts and their fittings can crack, which is why inspection matters.

How do I dispose of old fuel and the old tank?

Contact your local household hazardous waste facility or a recycling center for fuel disposal. Do not pour fuel down drains or onto the ground. Many facilities also accept used tanks.