How To Bypass EVAP Canister – The Complete Guide

Your EVAP emission control system has broken down or is working with less efficiency than normal, and you want to remove it. Since you’ve never done this before, how to bypass EVAP canister is all over your head.

Don’t let this small task take up too much of your time. This guide has detailed instructions and useful information, so you know what you’re working with!

Overview Of EVAP Canister

What Is An EVAP Canister?

The gasoline fuel which our modern vehicles run on consists of various hydrocarbons. These compounds are volatile and easily evaporate even at a low temperature.

This results from the fact that if you leave a small amount of gasoline fuel out in the open air for a while, it’ll disappear soon before it really becomes bad gasoline.

You can also smell gas in the surrounding air at the same time.

That being said, cars and other gas vehicles will need something to store the fuel vapor when not used to prevent fuel loss and air pollution. That solution comes in the form of an EVAP canister.

The system includes a charcoal canister, an EVAP purge control valve, and some other valves to prevent the gas vapors from escaping. There is a vapor hose that links the gasoline tank to the canister.

Function

The charcoal canister contains activated charcoal, which traps the fuel vapor inside the EVAP canister when the engine is off. When the vehicle runs, it will release the fuel fumes to make a vapor purge.

The engine computer controls the purge control valve (or a solenoid). When the vehicle is off, the valve closes.

When the engine operates, the computer commands the solenoid to open the engine purge vacuum. This step sucks fresh air in through the vapor storage.

The new fresh air brings a certain amount of gas vapors to the engine to be burned in the combustion chamber.

When the engine purge vacuum works, you can hear some clicking sound under the car hood.

How To Bypass EVAP Canister?

Reasons For Removing The Faulty EVAP Canister

The Reduction Of Charcoal Pores

As mentioned above, inside the vapor storage is activated charcoal with numerous pores. These pores absorb and let off the vapor while the purge valve opens and closes.

However, many factors can affect charcoal’s porosity. When the car operates, it crushes the charcoal particles, turning them into fine powder.

Sometimes, the liquid fuel or condensed gas vapors accidentally entering the charcoal canister can also harm the pores.

Once the particles lose their ability to trap gas, they will eventually clog the fuel vapor vent line.

This time, you might wonder: Can you bypass a vapor canister?. Go ahead. You won’t want the fine charcoal powder to worsen your engine bay performance.

Damaged Charcoal Filter

This is also one of the factors that result in a bad canister. The vapor storage has fuel filters at its entry and exit ends.

Over time, these fuel filters deteriorate and start to leak charcoal into the purge control valve.

Clogged Outlet Nozzles

The fuel vapor storage outlet nozzles are often in contact with the atmosphere, making it very easy for dirt and mud to accumulate.

It would be best if you cleaned these nozzles regularly to ensure the gas fuel can go through normally.

Purge Valve Problems

One of the common vehicle-related problems car owners often meet with the engine purge vacuum is that it doesn’t close fully, leading to the Check Engine light lighting up.

This will make it harder to operate the modern vehicles after a fuel pump from the fuel tank.

Instructions

Preparations

• WD-40 Spray to lubricate joints, nuts, and engine vacuum lines and take them off easily
• A ratchet with a ten-millimeter socket
• An extension
• An open-ended runch
• Scissors
• A vacuum cap assortment kit

Steps

Step 1: Removing The Bad Charcoal Canister 

There are two lines on top and one at the bottom of it.

With the ones on top, you use the plier to squeeze them and twist. Don’t forget to spray some WD-40 on them beforehand; they’ll come out without hassle.

With the bottom line, after lubricating and some twist and pull, the engine vacuum line will loosen. It’s that easy to bypass charcoal canister!

Step 2: How To Bypass Purge Valve

Next, to remove the EVAP solenoid, it is plugged into a line on its side and a nut at the bottom. The plug on the side just needs a simple pull, and it’ll get out of your way.

The nuts will require an open-ended wrench and a ten-millimeter socket.

The purge solenoid has two engine vacuum lines: one goes on top of the vapor storage, which is already disconnected, and the other loops around underneath the engine air intake manifold.

Find the end of the second engine vacuum line and plug it out. Then, find a matching cap in the assortment kit to pop them on the vacuum ports.

Step 3: Loop The Remaining Hoses To Avoid Vacuum Leaks

This is the step where you loop the feed and the fuel vapor return line so that the engine base won’t fill up with fuel fumes and fuel smell.

There is a piece of rubber line on the engine vacuum line. Flip that rubber line around and plug both sides on the ports and the line, and we’re done.

FAQs

Can You Bypass EVAP System And The Car Still Runs Normally?

Yes, it can. If you keep the bad evaporative emission control system on, it will affect the engine performance and acceleration.

Can I Bypass Evap Canister and Still Pass The Smog Check?

Your vehicle can pass the smog check with an incomplete EVAP.

The Bureau of Automotive Repairs requires all emission monitors to be in the READY status except for the evaporative emission control system. Thus, a vapor canister delete will not cause a smog test failure.

What Happens If My Purge Valve Is Open?

As mentioned above, the purge valve opens when the car runs to allow the gas vapors to be burned.

Where Is The EVAP Sensor Located?

This pressure sensor is often placed on the vapor storage. You can find the pressure sensor mounted directly on the canister or through several hoses.

Conclusion

Can you remove EVAP canister? Yes. The evaporative emission control system provides a place to store gasoline vapors; however, if it goes wrong, don’t hesitate to remove it.

You’ve got our help. We have guided you through every step in how to bypass EVAP canister.

Hopefully, from now on, the normal vehicle operation will be blissfully smooth.