Skip the auto shop - Our mechanics make house calls

Q: Went to take the gas cap off and it blew air out.

asked by on

Truck won't start without priming the carb. Once it was started we found pressure in the tank. Is this the cause of a bad gas cap or another issue?

My car has 160000 miles.

A: Excessive pressure inside the fuel cell cou...

Excessive pressure inside the fuel cell could be caused by a clogged EVAP canister. This system is designed to filter vapors from the fuel tank for environmental reasons. If the canister is full or the purge solenoid is damaged that releases the pressure, this could cause the starting issues you're experiencing.

If you'd like to get this fixed, consider YourMechanic, as one of our mobile technicians can come to your home to diagnose your starting issue and help make an accurate repair.

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・Save up to 30%

Get a quote

What others are asking

Q: Gascap warning on 2007 Caravan

For the first issue, the gas cap will need to be replaced sometimes. I had a 2009 Dodge Charger that this happened to also. It's not something you can control. As for the second issue, it seems like it is...

Q: Car won't hold gas

Hello. This is a rare problem and it could be a bit difficult to pinpoint. First, an EVAP system check and a complete fuel system check would need to be done to determine what exactly is causing the gas to...

Q: my car stalls at stop signs an red light often even when it in idle.

A failing torque converter clutch solenoid is a common item to cause this sort of concern, but there are other parameters that must be looked into as well. A large vacuum leak can cause the engine to stall once the...

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...
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.