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How to Fix Leaky EVAP System on Jeep Wrangler?

Every Jeeps have a leaky EVAP system at some point or another, and it can really be a pain to come by. However, fixing the EVAP system isn’t quite as bad as it may seem like.

You see, some cars have this cool little device called the EVAP system that eliminates most of the harmful gasses coming out of your car engine before they are released into the atmosphere.

So yeah, it’s kind of important. Moreover, you might be wondering: how do I fix a leaky EVAP?

This blog post will tell everything you need to know about Jeep wrangler EVAP leaks – what causes them, how to fix them, and more.

We hope this information helps you keep your Jeep running smoothly for many years. keep reading!

What Are The Symptoms of An EVAP Leak In A Jeep Wrangler?

As a jeep owner, you must know about the possible Jeep wrangler EVAP leak indications. Let’s see some of the common EVAP Leak symptoms that your Jeep wrangler may indicate.

1. The check engine light is on

If the check engine light on your Jeep Wrangler comes on, it might be because of a problem with the emissions set-up. The EVAP system is responsible for capturing fuel vapors and preventing them from entering the atmosphere.

2. Bad fuel economy

One of the most common symptoms of an EVAP leak in a Jeep Wrangler is poor fuel economy. If your Wrangler is suddenly getting poorer gas mileage than usual, it could be due to an EVAP leak.
It happens because the fuel vapor leaking from the tank isn’t being burned by the engine, which means that your jeep is using more fuel.

3. The service light of the fuel system is on

When you see the Fuel System Service light on in your Jeep Wrangler, it’s a good indication that there may be an EVAP leak.

4. Having a hard start

One of the most common symptoms when looking for signs of an EVAP leak in a Jeep Wrangler is a hard start. It typically indicates an issue with the vehicle’s evaporative emissions system that is preventing it from functioning properly.

5. Poor handling

In most cases, poor handling emerges as one of the important symptoms of an EVAP leak in a Wrangler.

It may manifest as sudden or unexpected changes in steering response, such as losing control while making sharp turns or experiencing the uneven braking performance.

6. Surging while driving

Other common symptoms of an EVAP leak include surging and hesitation while driving, and an increased tendency to stall while idling.

7. Engine misfires

An engine misfire is often one of the signs of an evaporative emission (Evap) system leak in a Jeep Wrangler. The EVAP system captures fuel vapors from the fuel tank and stores them in a charcoal canister.

The vapors are drawn into the engine and burned when the engine is running. However, if there is a leak in the system, the vapors will escape and cause the engine to run less efficiently.

8. Rough gasoline smell

Symptoms of an evaporative leak in a Jeep Wrangler can include a strong gasoline smell inside the cabin, particularly when running.

9. Smoke coming from the exhaust pipe

A lot of people don’t notice EVAP leaks until their vehicle begins smoking or cutting out while driving, which can be dangerous! So, if there is a hole or crack in the EVAP system, it can cause a leak.

If you are experiencing any of these symptoms, it is important to take your Wrangler to an experienced mechanic to identify and address the issue. With proper repairs, you can get back on the road and enjoy all the capabilities that your sporty jeep offers!

How To Fix Jeep Wrangler EVAP Leak?

EVAP leaks are common, but there’s more than one way to fix them! Find out about the best methods below for repairing your vehicle:

Method-1: By replacing the gas tank:

Whenever you notice there is a leak in the gas tank, you’ll need to replace the gas tank seal. And here’s how to do it:

  • Remove the old seal

To fix a gas tank seal, you’ll need to remove the old seal and apply a new one. So, use a knife to scrape the old seal off.

  • Clean the removed area

Once the old seal is removed, clean the area around the seal with rubbing alcohol.

  • Apply sealant

Then, apply a generous amount of sealant around the hole’s edges.

  • Place the new seal

Place the new seal over the hole and press down firmly. Allow the sealant to dry before moving on.

Method-2: By replacing the fuel line:

If you find any leak in the fuel line, you’ll need to replace it. And how to do that? Keep reading:

  • Trace the fuel line to cut

To fix a fuel line, you’ll need to cut out the section of the fuel line that’s leaking and replace it with a new one. Start by tracing the length of the fuel line with a pencil, hence you know where to cut.

  • Cut the line

Then, use a sharp knife to cut through the fuel line.

  • Apply sealant

Clean the area and apply a good amount of sealant to the verge.

  • Put the new seal

After that, put the new seal and let the sealant dry.

You can prevent further evaporation leaks and keep your Jeep Wrangler looking and running its best by taking these steps.

What Does A Jeep Wrangler EVAP Leak Cause?

There are a few reasons why a Jeep Wrangler might have an EVAP leak. Some common causes of this problem include:

1. Faulty gas cap:

A gas cap that is not properly sealed can allow vapors to escape from the tank and leave a leak in the evap.

2. Problematic charcoal canister:

Problem with the charcoal canister can also cause an EVAP leak. The charcoal canister is responsible for trapping vapors from the fuel tank, and if it is damaged or leaking, those vapors can escape into the atmosphere.

3. Leak in the fuel line:

A fuel line leak can allow gasoline to contact the evaporative emission control system. It causes an EVAP leak.

Spoiled purge valve

The EVAP system uses a purge valve to allow fresh air into the EVAP canister, which helps to remove any fuel vapors that may have been collected.
However, if the purge valve becomes spoiled, it can cause fuel vapors to leak out of the system.

4. Damaged EVAP hoses:

When the EVAP hoses on your jeep become damaged or loose, leaks can develop in this network of pipes. These leaks can cause damage to your vehicle, resulting in lower fuel efficiency and other performance issues.

Any of these problems can cause an EVAP leak, and it is important to have them repaired as soon as possible to prevent further damage to your vehicle.

How Much Does It Cost To Fix A Leak In The Jeep Wrangler EVAP System?

The cost to fix a leak in the Jeep Wrangler EVAP system can vary depending on several factors. That includes the extent of the leak, the materials and labor involved in repairing it, and any additional problems discovered during the repair process.

Generally speaking, you can expect to pay anywhere from $75 to $100 to the mechanic for this type of repair, while the prices of the parts are around $300.

However, you should always have a mechanic analyze your Jeep and determine the specific cause of the leak before proceeding with any repairs. It will help ensure that you get an accurate estimate and avoid any unnecessary costs down the line.

Is It Safe To Drive Jeep Wranglers with EVAP Leak?

Can you drive a Jeep Wrangler if it has an EVAP leak? The answer is yes, but you should have the problem fixed as soon as possible.
While it’s not an immediate danger, driving with an EVAP leak can be harmful to the environment and may eventually cause your Jeep to break down.
Hence, if you’re experiencing any symptoms of an EVAP leak, such as a decrease in fuel efficiency or an increase in engine noise, take your Jeep to a mechanic for diagnosis and repair.


We hope this article gives you the information necessary to DIY the fix on your Jeep and that we can help alleviate some of the stress of figuring out what is wrong with the Jeeps EVAP system.

Be sure to fix a faulty EVAP system before using your Jeep on the road, take it for inspection and get any necessary repairs—leaking fuel is certainly something you want to prevent.

Good luck on your journey to identify the root cause on why this is occurring and repairing it ASAP.

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