Replacing Infiniti I30 Fuel Vapor Recovery Canister: Step-By-Step Guide

The Infiniti I30 fuel vapor recovery canister, also known as the charcoal canister, is an emission control device that prevents harmful vapours from fuel evaporation from entering the atmosphere. This component is part of the EVAP system, which also includes the filler cap, or gas cap, and works by storing and redirecting fuel vapours back into the fuel tank for later use. This canister can be replaced, and there are several online guides and videos that explain the process. The cost of replacement parts ranges from $102.99 to $285.65, with labour costs estimated to be between $46 and $58.

Vapor Canister Purge Valve replacement

The Infiniti I30 Vapor Canister Purge Valve can be replaced by following these steps:

Firstly, identify whether your purge valve needs to be replaced. A stuck-open purge valve can cause fuel vapour to leak, leading to a noticeable odour around the engine. Poor engine performance, such as rough idling, reduced fuel economy, and difficulty starting the vehicle, can also indicate a faulty purge valve. If your vehicle fails an emissions test, this may also be due to excessive vapour leakage, which is a symptom of a purge valve issue. An illuminated check engine light, accompanied by diagnostic codes like P0443 and P0441, may also signal a problem with the purge valve.

Before you begin, gather the necessary tools and the replacement vapor canister purge valve. You will need a 10mm wrench, and a punk buster is recommended as the screws that hold the vapor canister purge valve might be hard to take off.

Now, locate the purge valve. Depending on your vehicle's make and model, the purge valve may be situated in various locations, including between the fuel tank and intake manifold or atop the engine. Once located, disconnect the vehicle's battery to prevent electrical shock and ensure safety during the procedure.

Next, remove the electrical harness and vacuum lines connected to the purge valve, noting their positions for reinstallation. Then, unscrew the bolt securing the purge valve to the fuel tank or mounting bracket.

Now, it's time to install the new purge valve. Securely attach the new valve, ensuring proper alignment and tightness of fasteners. Put the vacuum lines and electrical harness back, ensuring secure connections. Consider replacing any damaged vacuum hoses to prevent future issues.

Finally, reconnect the battery to restore electrical power and functionality.

You should now have successfully replaced the Infiniti I30 Vapor Canister Purge Valve.

Hose and screw removal

To remove the hoses and screws from your Infiniti I30's fuel vapor recovery canister, you will need a 10mm wrench and a punk buster. It is recommended to use a punk buster as the screws that hold the vapor canister purge valve in place can be difficult to remove.

First, take out the hose that is connected to the purge valve. Then, try to remove the screws. If you are unable to access the screws, you can remove the hoses around the valve, which can be easily reattached later. Some of these are secured with a clamp, which can be moved with a pair of pliers.

If you are still unable to remove the screws, you will need to replace the entire canister. This is a simple job, requiring you to simply take out the screws around the canister and remove it, along with the valve attached to it.

EVAP system diagnostics

The EVAP system is an important component of your vehicle's emissions control system, preventing fuel vapors from escaping into the atmosphere and protecting the environment from harmful fumes. When there is a problem with the EVAP system, the check engine light will usually illuminate, indicating that diagnostics are required to identify the issue.

One of the most common issues with the EVAP system is a loose gas cap, which can often trigger the check engine light. If you notice this light after recently filling up with fuel, it is recommended to use a code reader or take your vehicle to a mechanic for diagnosis.

To diagnose an EVAP leak, you can use an OBD2 code reader to identify the problem. Common codes include:

• P0442 – Small leak detected
• P0445 – System leak detected
• P0440 – EVAP System
• P0446 EVAP Vent solenoid valve control system
• P0411 – EVAP system control incorrect purge flow

It is important to note that EVAP leaks can be challenging to diagnose and repair, and it is usually best left to experienced professionals.

To prevent issues with the EVAP system, it is recommended to avoid overfilling or topping off the fuel tank. Overfilling can cause the charcoal canister to fill with fuel, leading to system failure and degradation. Regular cleaning and inspection of the fuel cap can also help prevent EVAP failures.

When diagnosing EVAP system issues, it is crucial to follow a systematic approach. Here are the steps to diagnose a fault code:

• Retrieve fault codes: Use a scan tool to obtain any current, historical, or pending codes, along with freeze frame information to understand the vehicle's operating conditions when the code was set.
• Obtain vehicle-specific system information: Ask the customer if they have tightened the fuel cap or filled the tank since the light came on. This information can provide valuable insights into potential issues.
• Duplicate the concern: Use a smoke tester to check for leaks, but only if you have confirmed that the vehicle's operating conditions meet the requirements for running the EVAP monitor test.
• Test the system: If there is insufficient information to verify a current leak, use your scan tool's bi-directional controls to perform a "service bay test" or a similar manufacturer-specific test to assess the EVAP system's functionality.
• Monitor oxygen sensors: During the test, observe the oxygen sensors. When the purge valve opens, there should be an increase in voltage on the upstream oxygen sensor(s), indicating vapor flow.
• Calibrate the flow meter: Follow the tool manufacturer's instructions to calibrate the flow meter. If the ball in the flow meter moves from its "no flow" position, there is a leak in the system.
• Apply smoke to the system: Use a smoke machine to apply smoke to the system and look for smoke trails, especially in hard-to-see areas like the top of the fuel tank or inside body panels.
• Use a laser pointer: If the leak is difficult to locate, try dimming the lights in the shop and using a laser pointer along the EVAP lines to highlight the smoke trail.
• Test solenoids: Intermittent solenoid leaks can be a common issue. Connect your smoke tester directly to the solenoid while energizing and de-energizing it to look for smoke leaks.
• Compare resistance: Use a DMM to compare the resistance of the solenoids to the specifications provided by the manufacturer.

By following these steps and working with a qualified technician, you can effectively diagnose and resolve issues with your Infiniti I30's EVAP system, ensuring the system functions properly to protect the environment and improve fuel efficiency.

Fuel cap inspection

The fuel cap indicator light is an important warning light that should not be ignored. If the light comes on, it means that the computer has detected a leak in the fuel system, usually from a loose gas cap. Here is a step-by-step guide on what to do when the fuel cap indicator light comes on:

• Pull over in a safe spot and re-secure the fuel cap. Continue driving normally with the light illuminated.
• If the light doesn't turn off within a day or two, inspect the gas cap for any damage. A fuel cap inspection involves checking the following:

• Ensure the fuel cap is on and securely fastened. Sometimes, drivers forget to put the fuel cap back on after fuelling their car. Check that the fuel cap is tightly fastened and turned until it clicks.
• Check the fuel cap O-ring for any dirt or debris. The O-ring is an important component that helps the car recognize when the cap is on. It may need to be cleaned and lubricated for the car to detect that the gas cap is on.

If the gas cap looks okay and the light is still on, there may be a leak elsewhere in the system. Have a certified technician inspect the issue and determine the cause.

It is important to note that a loose fuel cap can cause a slight reduction in performance, and your engine will have to work harder, resulting in diminished fuel mileage. Additionally, a loose fuel cap can lead to the release of harmful gases into the environment. Therefore, it is crucial to regularly clean and inspect the fuel cap to prevent EVAP system failures.

Charcoal canister maintenance

The charcoal canister is an emission control device that prevents fuel vapors from escaping into the atmosphere. It is a crucial component of the evaporative emission control (EVAP) system. While the charcoal canister rarely fails, it can sometimes crack or become clogged, leading to issues such as difficulty filling the fuel tank, a strong fuel smell, and increased emissions. Here are some maintenance tips to keep your charcoal canister in good condition:

Regular Cleaning: Charcoal canisters should be cleaned at least once every 15,000 miles to ensure their longevity. However, it's important to note that not all canisters can be cleaned, and in such cases, replacement is the best option.

Avoid Overfilling the Fuel Tank: Overfilling or topping off the fuel tank can lead to charcoal canister failure. The excess fuel can cause the canister to fill with fuel, resulting in system failure and degradation of the charcoal canister.

Regularly Check the Fuel Cap: A faulty fuel cap is a common reason for EVAP system failures. Regularly cleaning and inspecting the fuel cap can help prevent these issues.

Seek Professional Help: If you suspect an issue with your charcoal canister, it's best to consult a professional technician. They have the necessary equipment, such as scan tools and smoke machines, to diagnose and repair EVAP system problems accurately.

Understand the Symptoms of a Failing Charcoal Canister: Some signs of a failing charcoal canister include a lit check engine light, difficulty in filling the fuel tank, a strong fuel smell, increased emissions, and poor engine performance. If you notice any of these symptoms, have your vehicle inspected as soon as possible.

Frequently asked questions