Skip the auto shop - Our mechanics make house calls

Q: Car is shutting off while driving

asked by on

My car is occasionally shutting off and having trouble when starting up. The battery/electronic components are in perfect working order. Therefore my main suspicion is that it has something to do with the way that gasoline is delivered into the system for the following reasons: 1. The gas cap reads "turn until you hear a single click", however the cap no longer clicks at all when turned all the way. When turning the car on after filling it up I have to step on the gas pedal for roughly 30 seconds in park before proceeding in drive otherwise it will shut down. 2. When the car was new, the check engine light turned on a few times and the dealer said it was something to do with the gas cap not sealing properly. At one point they replaced a meter inside the gas tank. 3. When the car shuts off when running, it is only when I'm in stop and go traffic. When I'm driving at normal speeds, it runs normally. My question is this: Would replacing the gas cap make a difference, or is it the fuel pump or some other problem?

A: The first thing to do is to have the fuel c...

The first thing to do is to have the fuel cap replaced. The cap may be overtightened, causing gas tank venting to be blocked. If this gets blocked then the fuel tank can go into a vacuum and cause the stalling. If pressure builds up in the tank it could not release excessive pressure if the cap’s vent purge system is not working properly. Have the check engine light scanned to see the codes in the system and replace the fuel cap. Make sure you are using quality fuel and no E85 since it may cause problems in the fuel system of your car. This fuel is mostly alcohol and will cause reduced performance in vehicles not equipped to use it. You may need to have the throttle body, idle control valve, and mass airflow sensor cleaned. Make sure you are not using an oil type air filter as this will damage the mass air sensor. If you need assistance with this, a certified mobile mechanic from YourMechanic can examine your vehicle at your home or office.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Car keeps overheating and losing antifreeze. Thermostat and hoses are all fine. What else could it be?

Hi. I believe your Hyundai has a blown head gasket. This failure mode may not contaminate engine oil with coolant as sometimes occurs. The lost coolant may go into the cylinder or the exhaust instead. A slightly sweet smell from...

Q: Rapidly blinking lights

Hello. If you have correctly installed the resistors into the LED turn signal circuit, and the rapid blinking continues then it may be possible that there is a problem with the resistors, or that you require resistors with a greater...

Q: How long will my fuel pump last?

When trying to figure out how long a fuel pump will last, many factors need to be considered, including the age of the pump, its level of use, and fuel system contamination. Older vehicles used a fuel system which recirculated...

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.