Skip the auto shop - Our mechanics make house calls

Q: Fuel air?

asked by on

A "Check gauges" light turns on randomly for a few seconds then turns off, and 20mins later it's on. When I turned on my truck in the afternoon, it sounded kinda funny like a air escape, so I turned off the truck and went to go open my fuel knob, as soon as I turned it, air escaped as if it were holding pressure. What is it? Or what would it be?

My car has 135049 miles.
My car has an automatic transmission.

Hi there:

In many cases, excessive vacuum pressure that is released from the fuel cell when you open the fuel cap is caused by a malfunction of the EVAP vent solenoid. This component is designed to relieve pressure inside the fuel tank but also ensure that harmful gases are filtered through a EVAP tank before being released to the atmosphere. When the EVAP system is faulty, it can cause the check engine light to illuminate quickly or stay on for extended periods; as well as negatively impact engine performance. The best way to know exactly what parts are causing your troubles is to contact a local mechanic and have them complete a check engine light inspection.

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: Is it normal to hear the gears as you shift?

Hi There, This is somewhat normal to an extent to hear a slight whining of gears, especially in a vehicle with a manual transmission where the exchange of gears is dependent upon the driver. In some cases, however this may...

Q: How do I set a DVD rating?

All movies come with a rating set on a 1-8 scale. 1 means the movie is appropriate for all audiences, while 8 means it is only appropriate for mature audiences. To keep the movies in your car appropriate, you can...

Q: Shifter won't move - stays stuck on park.What could be wrong with it? 2004 Dodge Durango

Hi - having changed the brake light switch (most common source of this problem) and confirmed that brake lights are now working (if not, check brake light wiring - switch does more than brake lights), the shift interlock solenoid is...

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...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...