Questions tagged [fuel-cap]

Tightening cap that seals the fuel system form the filler neck to the fuel tank.

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1answer
66 views

Manual release of fuel door on 1998 VW Beetle

My daughter bought a ‘98 Beetle as a project car. The previous owner cut a number of wires and portions of the chassis electrical system don’t work, like the fuel door release and the power windows. ...
2
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3answers
3k views

What can cause “check gas cap” warnings other than a loose gas cap?

I have a 2006 Saturn Ion, and a few months ago I started getting a warning about my gas cap. Specifically, as I was driving the dash display would beep and say "Check Gas Cap." I bought a new cap to ...
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votes
1answer
6k views

Check emission system displayed on dashboard display

For the last week it has been extremely cold where I live (varies between -27 to -33 degrees Celcius). Is it possible for a fuel cap check valve to freeze open? Last night leaving work the display ...
4
votes
2answers
688 views

What should I be looking for in a gas cap?

I've misplaced my fuel cap because reasons. I need to get a new one, but I'm not sure what exactly I should be looking for or how to figure out what will work for my vehicle. Are all caps the same? ...
7
votes
1answer
6k views

Can't fill car up with gas

I can no longer fill up my gas tank in one go. This started gradually over a few months, initially only happening at one pump at the closest station. Now, however, I can't get more than a gallon or ...
2
votes
1answer
87 views

Does a full fuel tank speed up the CEL turning off after changing the fuel cap?

Consider this scenario: The CEL (check-engine light) is on. The fuel cap is subsequently replaced. The fuel tank is half full. I am wondering: Is it advantageous to fill the tank to the top to ...
13
votes
2answers
706 views

Does waiting until the gas cap become faulty cause any damage?

The description for a fuel tank cap says: You can prevent unnecessary service costs by replacing the gas cap on modern vehicles before they go bad and the check engine light appears. Is this ...
3
votes
1answer
13k views

Cleaning the gas cap to rule out that tightness is the cause of the “check engine” light

The gas cap on my 2003 Pontiac Vibe used to make a slight sound of "pssstt..", the sound of some air either entering or exiting from the tank as I was opening the cap. Two months ago, the gas cap ...
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1answer
998 views

Check Engine Light for bad gas cap [duplicate]

I am just wondering... a friend told me that a faulty gas cap can cause air in the tank.. is that true? also, can that cause the check engine light to come on?
3
votes
2answers
3k views

Excessive vacuum making new fuel cap hard to remove

I recently had the gas cap changed (told there was a vacuum issue) at inspection. It is very difficult to remove this new cap when I go to fill up. Now the car is experiencing episodes where it does ...
4
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5answers
24k views

P0442: Faulty EVAP System

After seeing my CEL come on in my '05 Mazda 3 (just passed 100K mi.), I used my code reader to find out that the code was P0442. So I naturally came to this website to see what I could find on the ...
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3answers
443 views

GOLF 5 GTD gas error led

I have the gas error light (yellow) always on, It turns off some time but it turns on again. I have some cleaning of the air system but it did not work. What could be the problem ?
5
votes
5answers
37k views

VW Golf fuel filler cap will not unlock

The fuel filler flap on my 09 VW Golf estate (diesel) will not unlock. I have tried locking and unlocking the car which should relase the filler flap but it remains locked. The owner's manual says ...
16
votes
4answers
154k views

How important is a fuel cap?

I lost my fuel cap a couple months ago and haven't bothered finding a replacement. I haven't noticed any issues with it, but I'm wondering whether it's causing any damage or reducing gas mileage or ...
16
votes
2answers
16k views

Why would a new gas cap cause the “check engine” light to shut off?

This happened to a friend of mine: The "check engine" light came on in his truck (Toyota). He replaced the gas cap and the light shut off. Then I also had a "check engine" light come on in my 1994 ...