Q: Car is difficult to start and keep running after adding fuel.

asked by on December 03, 2016

After adding fuel to car vehicle acts like it ran out of gas. Must crank engine for much longer than usual and keep feathering throttle for nearly 1 minute. Eventually car doesn't start at all. Last time a mechanic used blue sealer on oil cap,gas cap and air intake pieces. Frustrating!

My car has 166000 miles.

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

Fans not working, and car overheats

If your fans are not coming on, that is likely why the vehicle is overheating when still. This may or may not be related to the air conditioning not functioning correctly. I would recommend having a professional technician, such as...

Rear passenger side wheel completely locked up.

It is possible that the parking brake cable has seized, due to rust, at that wheel position. That would be relatively easy to determine based on a visual inspection. If you desire that this problem be diagnosed by a certified...

Engine misfire on all cylinders

The actual codes would be needed to steer you in a precise direction. Generally, global misfires are a consequence of a major fuel and/or air induction system issue. Your vehicle has individual spark plug coils so that is not likely...

Related articles

A Buyer’s Guide to the 2012 Hyundai Sonata Hybrid
When When Toyota first introduced the Prius, the idea seemed to be that all hybrids and electric cars had to have their own specific models and that they couldn’t look like normal cars. A lot of consumers weren’t too thrilled...
The Best Used Cars to Buy for College Students
You’ve You’ve done it – high school is officially behind you. Now it’s time to head off to a brand new world. College is that and more and you may need a car during your pursuit of a higher education....
The Best Used Cars to Buy If You’re a Photographer
If If you are a photographer, and you’re considering buying a used car, the big thing to consider is the type of photography you do. Thanks to the advances in digital photography, chances are you’re not hauling around a lot...