Driving test question about.
Loose filler cap cause.
From uk driving theory testcars and small vehicles.
Cap does not tighten properly.
And possible answers include.
If your gas cap is not properly attached you may see a check engine light or a loose cap warning light on the dash.
If the cap does not click or clicks and then pops loose again then that may be a sign that it may need to be replaced.
Usually a bad or failing gas cap will produce a few symptoms that can alert the driver of a potential problem.
A loose filler cap will not prevent the engine from starting although it may cause the engine light to appear.
These codes typically will be in the p0400 series and could indicate something more serious than a loose gas cap such as a broken seal or even a leak in the gas tank which is a much more serous problem.
Another symptom of a possible issue with the fuel cap is a fuel smell from the vehicle.
Or improve your vehicle s fuel economy.
A loose gas cap can cause problems ranging from an annoying gas smell to a more serious engine leak.
Or decrease fuel consumption of your vehicle.
Increase exhaust emissions from your vehicle.
It can increase the level of exhaust emissions.
It can make the roads slippery for other road users.
Then tighten the gas cap with your hand.
One of the first symptoms of a bad or failing gas cap is a cap that does not tighten properly.
If you are satisfied that the gas cap is not damaged fully install it into the filler tube.
Most fuel caps have a built in mechanism that will cause them to click once they are adequately tightened.
You can either tighten the cap and wait for the system to reset itself when it determines the problem is fixed or you can use an obd ii code scanner to manually reset the system.
Fuel smell from the vehicle.
What problems can a loose gas cap cause.
Many cars will also generate a warning signal if the on board computer detects any fuel vapor escaping from the gas tank.
The gas cap otherwise known as the fuel filler cap is an important but simple part found on most vehicles on the road.
It is a good idea to inspect the seal that is between the gas cap and the filler tube for any tears or cracking that could cause a vapor leak.
At the end of a dry spell of weather the road surfaces may have a high level of diesel spillage that hasn t been washed away by rain.
This is most likely to occur on bends junctions and roundabouts where it will make the road slippery especially if it s wet.
A loose filler cap on your diesel fuel tank may.
If so a simple gas cap replacement may be able to solve your problem.
Diesel fuel can spill out if your filler cap isn t secured properly.
Whilst fuel consumption may increase the level of exhaust emissions will not be affected by a loose filler cap.
