What is an evaporation vent solenoid?
The evaporation vent solenoid, which is monitored by the engine control module (ECM), is an important part of your car’s evaporative emissions control system, which manages fuel vapors that form in the gas tank. The job of the evaporation vent solenoid is to bring air into the charcoal canister to keep the EVAP functioning properly.
When open, the evaporation vent solenoid brings clean air into the system, which is pressurized and helps deliver fuel vapor to the engine. When the vent solenoid is closed, the engine control module performs a pressure test.
If everything is working correctly, the control module should sense no drop in pressure.
When should I replace the evaporation vent solenoid on my car?
You should take your car to an automotive repair shop for an inspection if you notice the following warning signs:
An illuminated check engine light: Your check engine light will activate if your engine control module (ECM) detects a problem with the EVAP system.
Pressure inside the gas tank: If there is a large burst of air when you remove your vehicle’s fuel cap, there is excess pressure inside the fuel cell.
Apparent full tank when refilling: When refueling your vehicle, the gas nozzle might constantly click off, even though your tank isn’t full yet.
A failed emissions test: Since your EVAP vent solenoid helps regulate emissions, your car could fail an emissions test without a functioning solenoid.
How often should an evaporation vent solenoid be replaced?
Unlike your vehicle’s wiper blades or oil filter, evaporation vent solenoids won’t be listed under your vehicle's regular maintenance schedule
. EVAP vent solenoids can last the lifetime of your car, but like any automotive component, they’re susceptible to wear and tear. Regularly check for warning signs of a faulty EVAP vent solenoid and take your vehicle to a mechanic if you suspect you’re in need of a replacement.
Can I replace my evaporation vent solenoid myself?
You can complete your evaporation vent solenoid replacement at home if you have the right tools and DIY auto repair experience, but remember that it’s vital to your vehicle’s overall performance to complete the job correctly.