Q: Evaporative Emissions Control

asked by on December 12, 2016

Why does all my gas pour out on the ground when I pump gas? Its coming out up behind the rear tire.

My car has 200000 miles.
My car has a manual 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

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

Car dies if I let off gas pedal

This is a common problem that I run across frequently on this engine. The most common cause of this is a bad intake manifold gasket. When this occurs it create a large vacuum leak that makes it hard for the...

My car won't start, not even let me inside the car- unlock it, where do I tow it? What do I do?

Hi Dani. Thanks for contacting us today. If you are a member of AAA, you should call them and they will send over a tow truck. Even if the vehicle can't be opened, they can usually get the vehicle on...

Truck shutting off after startup.

Hello, when you replaced the plug wires, it sounds like you removed all of them and then installed new wires. When you installed the new wires, it sounds like you got them out of order. The first thing to do...

Related articles

A Buyer’s Guide to the 2012 Subaru Tribeca
This This 7-passenger SUV may have trouble keeping its head above water in the sea of competition, but its standard AWD, clean exterior lines and style-forward cockpit design make it an attractive choice in an increasingly crowded segment. Aside from...
The Best Used Cars to Buy If You're a Fisherman
What What do anglers look for, specifically, in their vehicles? Lots of room, plenty of cargo space, and sometimes, the ability to handle rough terrain. Some fishermen also want the option of towing a boat. With that in mind, we...
Understanding the Subaru Low Oil and Service Indicator Lights
Car symbols, or dashboard lights, are a car service reminder. The Subaru Low Oil codes indicate when your car needs service.