Q: Trouble starting car after refueling.

asked by on

Our car has a hard time starting every time we put gas in and the check engine light is on. It starts up just fine every other time we start it. After we put gas in, we have to rev the engine for 30-40 seconds or so and then it runs just fine. Is it the purge valve on the emission canister?

My car has 65000 miles.
My car has an automatic transmission.

Your car has a small purge valve that controls the venting of fumes from the fuel tank as these fumes build up inside, particularly when you are refueling the car with gas. The EVAP system prevents fuel vapors from the fuel tank from escaping into the atmosphere. The EVAP system collects and temporarily stores the fuel vapors in the charcoal canister. The charcoal canister is filled with activated carbon pellets that can absorb the fuel vapors. When the engine is running, the fuel vapors are purged from the canister and burned in the engine. The vent control valve (solenoid) controls the flow of outside air in and out of the charcoal canister. The vent valve is controlled by the engine computer (PCM). Normally the vent valve is open. It closes when the engine computer tests the EVAP system for leaks. If a leak in the EVAP system is detected, the Check Engine light will illuminate on the dash and the trouble code related to the problem will be stored in the engine computer. When an air leak is present in the EVAP system, the MAP sensor will not be able to determine the air density, and the MAF sensor will not be able to determine the volume of air, entering the engine correctly. This will lead to an over fueling situation or an under fueling situation depending on the size of the air leak and engine operating speeds and load. This may eventually lead to catalytic converter problems as well as misfiring problems. I would recommend having an expert from Your Mechanic come to your home to take a look at your car to diagnose your EVAP purge solenoid.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Trouble starting car after refueling.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: grinding noise under your right foot, because of wheel bearing bub?

Hi there. Usually this type of grinding noise as you've described is due to a wheel bearing that is failing. However, it can also be a warped rotor, damaged brake pads or a CV joint issue. It's probably best to...

Q: Where is the cylinder head over protection sensor located in 2015 ecoboost mustang

Hello. From what you describe it would appear that the sensor you are referring to would be the coolant temperature sensor, also known as the engine temperature sensor. As it's name implies, the coolant temperature sensor monitors the coolant temperature...

Q: Does the car have to be driving down the road for the computer to sense a Fuel line EVAP leak?

In order for the EVAP system to complete the drive test you need to be at a cruise steady speed with engine warm and no check engine light on. The actual speed is needed will be in overdrive above 45...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...