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What Are the Symptoms of a Bad Leak Detection Pump?

What Are the Symptoms of a Bad Leak Detection Pump?

Understanding “what are the symptoms of a bad leak detection pump?” Is very critical to prevent dealing with major vehicle issues. In general, when the leak detection pump goes bad, your vehicle will not pass the emission test, and it will immediately trigger a check engine light.

Manufacturers and automotive experts work every year to perform upgrades to the vehicle's components and prevent as much as possible from harmful gases reaching the environment. The Environmental Protection Agency also puts some restrictions and enforces laws to prevent potential vehicle gas from harming the environment.

Auto Repairs Are EXPENSIVE

One of the very critical components that every vehicle must have is a leak detection pump. Learning about the symptoms of a bad leak detection pump is critical for every driver to prevent dealing with situations where your car does not pass the emission test. Let's look below at the leak detection pump and the main symptoms that you must keep an eye for indicating the leak detection pump.

What is the leak detection pump, and How does a leak detection pump work?

The leak detection pump is a critical component in your vehicle that is responsible for alarming your car when there is any minor internal leak. Whenever the leak detection pond text signs of leaks, it triggers the check engine lights.

The leak detection pump also monitors the behavior of your fuel system by monitoring the movement of fuel vapors. It also has to do with confirming that the fuel system does not cause any harm to the vehicle and the environment.

By law, every vehicle must drive with a perfectly running leak detection pump. This way, the authorities confirmed that the evaporative emission system or the EVAP works properly and there is no harm to the environment with you drive this vehicle.

When should a leak detection pump be replaced?

According to experts, the leak detection pump should last up to five years or 50,000 miles, whichever comes first. However, automotive experts also indicate that you might want to replace the leak detection pump earlier, depending on the symptoms you notice. Therefore, whenever you notice any symptoms indicating a bad leak detection pump, you should immediately replace us and not wait to the mentioned threshold.

What are the symptoms of a bad leak detection pump?

Learning about the common symptoms of a bad leak detection pump is critical for every driver to prevent dealing with major issues that could cost you thousands of dollars and prevent your vehicle from passing the emission test.

In general, if your vehicle has a bad leak detection pump, your vehicle will not pass the emission test. However, a check engine light illuminating an easier symptom that you might want to track indicating a bad leak addiction pump.

Obviously, with the check engine light illuminates, the problem might be linked to thousands of other issues. Therefore, you cannot immediately assume that it's the leak detection pump that is going bad. Therefore, you must use some tools to scan the vehicle's computer and understand what's going on.

For example, you can rely on the OBD 2 scanner and allow it to scan the last errors in your vehicle. Then, the scanner will display an error code that you can search up on Google to get an idea about its meaning.

If you don't have an OBD 2 scanner, you might want to visit the mechanic shop where your mechanic uses certain tools to help him figure out the main culprit triggering the check engine light.

How much does it cost to fix they got creative emission system leak?

With the adventures of the leak detection pump, it is important that to once the pump notices any leaks, it is important to take care of these leaks immediately to prevent paying thousands of dollars on complications.

Fixing evaporative emission system leaks cost you somewhere between $200 and $560. If you want to look at the price from parts and labor perspective, parts costs are expected to be between $150 and $440, while labor costs are between $35 and $140.

Despite the price and the money, it will cost to fix the EVAP leak, you must do so because your vehicle won't pass the emission test with a leaking EVAP system. If you don't already know, the EVAP system is responsible for capturing and housing any fuel emissions for evaporations and send them back to the field system to be used again.

How to replace a bad leak detection pump?

If you are a mechanic or your tools confirm that the leak detection pump is not in good condition, you must get it replaced if you want to pass the emission tests still and not cause harm to the environment.

While getting the leak detection pump replaced at a dealership or probably an independent shop is recommended, some experienced people might prefer to replace their leak detection pump by themselves. If you decided to go this route, we recommend that you confirm that you are 100% comfortable replacing the pump and not introduce mistakes that could cost you thousands of dollars.

For example, you can rely on youtube tutorials or probably detailed articles focusing on how to at least a bad leak detection pump.

In general, to the police they leak detection pond, you can follow these simple steps:

  • Remove the negative battery cable to disconnect it and ensure no electric charge gets to the leak detection pump.
  • Locate the leak detection pump by referring to your vehicle's owner’s manual.
  • To get to the detection palm, you want first to remove any vacuum or vapor lines that could block your way and prevent you from accessing the pump.
  • Compare the new leak detection pump to the old one to ensure that you got the right part
  • Install the new leak detection pump and ensure that you also reinstall the vapor lines and the other electric connectors that you disconnected earlier.
  • Reconnect your vehicle's battery
  • Perform a quick test to see that the EVP system is working properly.

How to test a leak detection pump?

If you notice that your vehicle has some symptoms indicating a bad leak detection pump, you can't immediately go ahead and replace it. Instead, you must perform a thorough inspection to confirm that your issue is coming from a leak detection pump.

Let's take a closer look at how to check and test early detection pump:

1-    Prepare necessary tools

Testing the leak detection pump is not a complicated shop and does not need a whole set of tools. Instead, simply select a good type of 21-inch vacuum that provides you with a consistent, continuous source of vacuum.

You will also need fuse jumper leads and 12 Volt switched power and ensure that your switch power has a ground source. Finally, you will need a latex pillow.

2-    Remove the old leak detection pump

For testing the leak detection pump, unfortunately, you can't do the test when the pump is connected to the vehicle. Therefore, you will have to take it out by following the instructions detailed in your vehicle's owner’s manual.

3-    Place the pump probably

To test the leak detection pump; you want a place with either a horizontal bench or a mounting vise made of plastic.

4-    Connect the pump to the fuse jumper

Once the pump is placed properly and securely, the next step is to connect the few jumpers to the leak detection pump connectors. Ensure that the pump is continuously connected to the ground and switch to the 12 Volt side.

5-    Connect the vacuum

The next step is to connect the leak detection pump to a continuous source of vacuum, which could be a decent 21-inch vacuum. After connecting the vacuum, you can collect the balloon to the Cassiar side of the leak detection pump.

6-    Inspect the vent

Before starting the tests, ensure it takes a closer look at the event and makes sure it's opened without clogging or blockage.

7-    Use the 12 Volt circuits

Once everything is connected, Use the 12 Volt circuit and toggle it to the pump. As you toggle the circuits, you'll notice that the balloon will immediately inflate. Keep doing so until the balloon stops inflating.

8-    Monitor the balloon’s behavior

After inflating the balloon, the balloon itself should hold the pressure and not deflate until you do so manually. If you notice that the balloon deflates, it indicates an internal issue with the air leak detection pump.

To confirm the leak and identify where it's located exactly, you can use a spray of soapy water. The soapy water will create some bubbles whatever there is a seal’s breakage

9-    Replace or reinstall the leak detection pump

If the leak detection pump has a problem, you must replace it following the instructions highlighted in this article. However, if the leak detection pump does not have any issue, you can safely reinstall it and check for other faulty components that could cause the EVAP problems.

What are the common causes for EVAP system leaks?

Although it's important to maintain a perfectly running leak detection pump, it is also essential to learn about the common causes of Eva P system leaks in the 1st place.

In general, the EVAP system might leak due to a problem with any of the following components

  • Issues with the purge valve
  • Damage is in the vents and the hoses
  • Breaks in the seals
  • Defection in the leak detection pump

Once you notice any of the mentioned symptoms, you must take your vehicle to the nearest repair shop and get the issue fixed immediately to prevent causing other complications that might impact the surrounding components.

Can I drive with a bad leak detection pump?

When your leak detection pump goes bad or when there is any problem with that EVAP system, you will not be prevented from driving your vehicle. In other words, your vehicle will drive just fine, but it's not recommended in the long term.

When the leak detection pump has a problem, your vehicle will throw a check engine light here. Therefore, you can't immediately assume that it's a leak detection pump and you're OK with continuing driving the vehicle. As you might already know, the check engine light might be linked to a major internal problem, and therefore, ignoring it can cost you thousands of dollars down the road.

To stay on the safe side, whenever you notice any symptoms of a bad leak detection pump, you should take your vehicle to the nearest repair shop and have it inspected and replaced if necessary. Keep in mind that a bad leak detection pump does not allow you to pass the emission test, and therefore, even if you can't drive your vehicle for a couple of miles, you must get it replaced at the end of the day.


Familiarizing yourself with the main symptoms that indicate a bad leak detection pump is critical for every driver here. This way, you don't have to worry about failing the emission tests and harming the environment.

Typically, a bad leak detection pump will trigger the check engine light, but this does not necessarily mean that it's always the leak detection pump vent going bad. Therefore, you must consult your mechanic or rely on some tools to help you understand the main culprit causing the issue.

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