2012 Chrysler 200 Fuel Vapor Leak Detection Pump Location: What You Need to Know Before You Replace Anything

The bottom line up front: The fuel vapor leak detection pump on a 2012 Chrysler 200 is part of the evaporative emissions (EVAP) system, and it is typically mounted near the charcoal canister, which sits underneath the vehicle close to the fuel tank area . On most Chrysler and Dodge models of this era, the pump is attached directly to the EVAP canister assembly, which is located on the driver's side, just forward of the rear axle and beneath the rear passenger floorboard. You do not need to drop the fuel tank to reach it; in most cases, you can access it by safely raising the car on jack stands and looking for a small cylindrical unit with an electrical connector and two hose barbs mounted to the canister.

While the leak detection pump is a common failure point on these vehicles—so common that parts managers at Chrysler dealerships used to keep multiple units in stock at all times —it is important to know exactly what you are looking for before you crawl under the car. This guide walks you through the location, the symptoms of failure, how to confirm the diagnosis, and what it costs to replace the part.

What Does the Leak Detection Pump Do and Why Should You Care?

The fuel vapor leak detection pump is a critical component of your vehicle's EVAP system. Its primary job is to detect leaks in the fuel vapor system and ensure that harmful hydrocarbons do not escape into the atmosphere . It works by creating a vacuum inside the EVAP system and monitoring for any pressure changes that would indicate a leak. The pump can detect leaks as small as 0.02 inches in diameter, which is roughly the width of a human hair . This level of precision is necessary to meet strict emissions standards enforced by the Environmental Protection Agency and state regulatory bodies.

If this pump fails, you will likely see a check engine light, fail an emissions test, or notice a fuel odor around your vehicle . Replacing a faulty leak detection pump promptly is essential for keeping your car running properly, passing state inspections, and protecting the environment.

Where Exactly Is the Leak Detection Pump on a 2012 Chrysler 200?

1. The Short Answer: Under the Car, Near the Charcoal Canister

On the 2012 Chrysler 200, the fuel vapor leak detection pump is mounted directly to or immediately beside the EVAP charcoal canister . The canister itself is located underneath the vehicle, typically on the driver's side, just forward of the rear axle and below the rear seat floorpan. This is the same general area where the fuel tank sits, but the canister is mounted to the body structure, not to the tank itself.

2. Getting to It: What You Will See

To access the pump, you need to raise the rear of the car safely using jack stands. Once you are under the vehicle, look for:

  • A black plastic canister about the size of a shoebox, mounted to the underbody
  • A small cylindrical pump attached to the canister with two hose barbs and an electrical connector
  • The pump will have a plastic housing with a visible diaphragm-switch sensing system inside

The electrical connector is an OE-style connector that plugs into the wiring harness, and the pump uses hose barb attachments with a 3-blade terminal type . On some models, the pump may be integrated differently, but on the Chrysler 200, it is a standalone unit that bolts or clips onto the canister.

3. What You Do NOT Need to Do

You do not need to remove the rear seat, open any access panel in the trunk floor, or drop the fuel tank to reach the leak detection pump. The fuel pump itself is located inside the fuel tank under the rear seat , but that is a completely different component. The leak detection pump is an emissions component, not a fuel delivery component, and it is accessible from underneath the car.

Common Symptoms of a Failing Leak Detection Pump

Recognizing the symptoms of a failing pump can save you time, money, and the frustration of failed emissions tests. Here are the most common warning signs:

  1. Check Engine Light Illuminated. This is the most frequent indicator. The onboard diagnostic system detects inefficiencies in the EVAP system and triggers the warning light. Typical trouble codes include P0440, P0442, P0455, P0456, P1494, and P1495 .

  2. Failed Emissions Test. If your vehicle fails a state emissions inspection, a faulty leak detection pump is often the culprit. When the pump fails, fuel vapors escape, increasing hydrocarbon emissions beyond legal limits .

  3. Fuel Odor. A noticeable smell of gasoline around your vehicle, especially after parking, indicates that fuel vapors are leaking from the EVAP system rather than being contained and routed to the engine for combustion .

  4. Poor Fuel Economy. While not always dramatic, a failing pump can allow fuel vapors to escape, which means you are literally losing fuel to the atmosphere. A properly sealed system ensures those vapors are burned in the engine .

  5. Difficulty Starting. In some cases, a faulty leak detection pump can affect the pressure balance in the fuel system, making the engine harder to start, particularly after the vehicle has been sitting .

How to Confirm the Leak Detection Pump Is the Problem

Step 1: Read the Trouble Codes

The first step is to connect an OBD-II scanner to the diagnostic port under the dash and read the codes. If you see P0442 (small leak), P0455 (large leak), P0456 (very small leak), P1494, or P1495, the leak detection pump is a likely suspect . These codes are triggered when the pump fails to detect the correct pressure or vacuum levels in the EVAP system.

Step 2: Visually Inspect the Pump and Hoses

Crawl under the car and inspect the pump and its two hoses for cracks, loose connections, or obvious damage. The hoses attach to the canister with barb fittings, and they can become brittle over time. A cracked hose can mimic a failed pump, so check the hoses first before replacing the unit.

Step 3: Check the Electrical Connector

Make sure the electrical connector is fully seated and free of corrosion. A poor connection can cause intermittent issues that are hard to diagnose. The OE-style connector should snap firmly into place .

Step 4: Listen for the Pump

When you turn the ignition key to the "ON" position without starting the engine, the leak detection pump may run a self-test. Some models run the pump during key-on, others during key-off. If you hear a faint whirring or clicking sound from under the rear of the car, the pump is at least receiving power.

If the codes return after clearing them and the hoses and connector check out, the pump itself is almost certainly faulty.

Replacement Options: OEM vs. Aftermarket

When it comes time to replace the leak detection pump, you have several choices. Here is what you need to know:

1. OEM (Mopar) Replacement

The original part number is 4861963AA, with superceded versions 4861963AB, 4861963AC, and 04861963AD . A genuine Mopar unit is guaranteed to fit perfectly and last as long as the original, but it will cost more. Expect to pay anywhere from $60 to $120 for the OEM part, depending on the dealer.

2. Aftermarket Replacements (Dorman)

Dorman makes an excellent direct replacement, part number 310-218, which is designed to match the original pump's fit and function . The Dorman unit is built with high-quality materials and is backed by over a century of automotive experience . It replaces part numbers 4861963AA, 4861963AB, 4861963AC, 4891729AA, and several other interchanges . The Dorman pump typically sells for around $25 to $40, making it a very strong value compared to the OEM part.

3. Aftermarket Replacements (Generic Brands)

Generic no-name pumps can be tempting on price, but they carry significant risk. Low-quality pumps may fail prematurely, have poor fitment, or trigger false codes. The diaphragm material in low-quality pumps is prone to cracking and swelling when exposed to ethanol-blended fuels like E10 and E15, which are now standard at most gas stations across the United States . Unless you are certain of the brand's quality, it is wise to stick with a known manufacturer.

How to Replace the Leak Detection Pump: A Step-by-Step Guide

Replacing the leak detection pump on a 2012 Chrysler 200 is a straightforward job that most DIYers can complete in under 30 minutes. Here is how to do it:

What You Will Need

  • A new leak detection pump (OEM or quality aftermarket)
  • A flathead screwdriver or a small pry tool
  • A 10mm socket or wrench (for the mounting bolt, if applicable)
  • Safety glasses and gloves

Step 1: Prepare the Vehicle

Make sure the engine is cold and the car is parked on a level surface. Raise the rear of the vehicle with a floor jack and support it with jack stands. Never work under a car supported only by a jack.

Step 2: Locate the Pump

Crawl under the car and locate the charcoal canister on the driver's side, just forward of the rear axle. The leak detection pump will be mounted to the canister or directly beside it.

Step 3: Disconnect the Electrical Connector

Press the release tab on the electrical connector and pull it straight off the pump. Do not yank on the wires.

Step 4: Remove the Hoses

The pump has two hose barbs. Use a flathead screwdriver to gently pry the hoses off the barbs. If the hoses are stuck, you can use a small pick to work them loose. Inspect the hoses for cracks or brittleness while they are off.

Step 5: Remove the Mounting Bolt or Clip

Most pumps are held in place by a single 10mm bolt or a plastic clip. Remove the bolt or unclip the pump from the canister.

Step 6: Install the New Pump

Slide the new pump into place and secure it with the bolt or clip. Reconnect the two hoses, pushing them firmly onto the barbs until they seat. Reconnect the electrical connector until it clicks.

Step 7: Clear the Codes and Test

Lower the car, start the engine, and use your OBD-II scanner to clear the codes. Drive the car through a few drive cycles (a cold start, a warm start, and some highway driving) to allow the EVAP system to run its self-test. If the check engine light stays off, the repair was successful.

What Does the Leak Detection Pump Cost and Is It Worth Doing Yourself?

Part Cost

  • OEM Mopar: $60 to $120
  • Dorman (310-218): $25 to $40
  • Generic: $15 to $30 (not recommended)

Labor Cost

If you take the car to a shop, expect to pay between $50 and $100 in labor, bringing the total to roughly $75 to $220 depending on the parts choice. Since the job takes only about 15 to 30 minutes of actual work, doing it yourself with a quality aftermarket pump like the Dorman unit will save you the labor cost entirely .

Is It Worth It?

Given the low cost of the part and the ease of access from under the car, replacing the leak detection pump is one of the highest-value repairs you can do on a 2012 Chrysler 200. A $25 part can clear a check engine light that would otherwise cost you $100 or more in diagnostic fees at a shop, not to mention the risk of failing an emissions test.

Why Replacing a Bad Leak Detection Pump Matters

Ignoring a faulty fuel vapor leak detection pump leads to several problems. First, your vehicle will continue to release pollution, contributing to smog formation and air quality issues. Second, you will likely fail your next emissions test, which can prevent you from renewing your vehicle registration in many states. Third, a malfunctioning EVAP system can cause unnecessary wear on other components, leading to more expensive repairs down the road .

From a safety perspective, the leak detection pump also helps prevent fire and explosion risks. Fuel vapors are highly flammable. When leaks go undetected, the risk of accumulating dangerous vapors increases .

A Word About Quality: Why You Should Choose KEMSO Fuel Pumps

If your diagnosis reveals that the issue is actually the fuel pump (rather than the leak detection pump), or if you want to ensure your fuel delivery system is running at its best, you should consider a KEMSO fuel pump.

KEMSO fuel pumps are high-performance, OEM replacement parts backed by a lifetime warranty. Unlike economy aftermarket pumps that may fail prematurely or provide poor fitment , KEMSO pumps are engineered to meet or exceed original equipment specifications. Each KEMSO pump is designed to deliver consistent fuel pressure and flow, ensuring your engine runs smoothly under all driving conditions . The brand has built a strong reputation for reliability, and the lifetime warranty means you only buy this pump once.

If you need a replacement fuel pump module or any related fuel delivery component for your 2012 Chrysler 200, visit the official KEMSO website at https://www.kemsoracing.com/ to browse their catalog of OEM-quality parts. With KEMSO's promise backed by a lifetime of confidence, you can be sure your vehicle is in good hands.

Frequently Asked Questions

Q: Can I drive with a bad leak detection pump?

Technically yes, the car will still run, but you will likely have a check engine light on, and you will fail an emissions test. Fuel vapors will escape into the atmosphere, which is bad for the environment and can cause a fuel smell. It is best to replace it promptly.

Q: How long does the replacement take?

For a DIYer with basic hand tools, the job takes 15 to 30 minutes once the car is raised. A professional mechanic will typically charge for one hour of labor.

Q: Will the check engine light go off immediately after replacement?

Not necessarily. After replacing the pump and clearing the codes, the EVAP system needs to run a self-test, which typically requires a few drive cycles. If the light stays off after a few days of normal driving, the repair worked.

Q: Is the leak detection pump the same as the fuel pump?

No. The fuel pump is an electric pump inside the fuel tank that delivers fuel to the engine . The leak detection pump is a small emissions component mounted near the charcoal canister under the car. They serve completely different functions.

Q: What is the OEM part number for the leak detection pump?

The original part number is 4861963AA, with later superseded versions including 4861963AB, 4861963AC, and 04861963AD . The Dorman equivalent is 310-218 .

Final Thoughts

The fuel vapor leak detection pump on a 2012 Chrysler 200 is located under the vehicle, mounted near the charcoal canister on the driver's side, just forward of the rear axle. It is an inexpensive, easy-to-reach component that fails regularly on these vehicles . Replacing it is a 30-minute DIY job that can clear a check engine light, get you through an emissions test, and prevent fuel vapors from escaping into the atmosphere.

If you confirm the pump is bad, buy a quality replacement from a trusted brand like Dorman or choose the OEM Mopar part. And if your fuel pump itself needs attention, remember that KEMSO offers high-performance, OEM-replacement fuel pumps with a lifetime warranty—a smart choice for long-term reliability. Visit https://www.kemsoracing.com/ to find the right pump for your vehicle and get back on the road with confidence.


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