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4 votes
Accepted

What should I be looking for in a gas cap?

Unless the price difference is outrageous, you're probably better off sticking with OEM. The reason being is that aftermarket caps (even by reputable brands) can leak, and based on what I remember ...
atraudes's user avatar
  • 707
4 votes

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

The evap test system creates a vacuum in the fuel system in order to check for integrity. The cap check light comes on when there is air leak somewhere in your system - it might be tank or cap or ...
AsenM's user avatar
  • 1,187
3 votes

Georgia Emissions Testing Missing Gas Cap "Evap Emission Control Sys Leak Detected (Small Leak)"

The ECU (Engine Control Unit, ie. computer) runs a bunch of tests, and stores any errors it encounters. Because an error was detected and the ECU has not been reset, the emission testing device read ...
the_storyteller's user avatar
3 votes
Accepted

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

There is know way to know how the software was programmed for any given car, from that I know most systems will not do a fuel tank integrity vacuum check when the tank is either past 3/4 or below 1/4, ...
Moab's user avatar
  • 7,990
3 votes

VW Golf fuel filler cap will not unlock

Locking and unlocking the car while applying a little pressure on the flap worked for me 👍. Repeat if it doesn't work the first time.
Peter's user avatar
  • 31
2 votes

Can't fill car up with gas

Slow or no flow for fuel in means no or low vapor flow out the vent system. Steps to test for testing for a blocked vent: Remove the CAN VENT fuse, #64 in the Underhood Bussed Electrical Center (...
Fred Wilson's user avatar
  • 11.6k
2 votes

VW Golf fuel filler cap will not unlock

Get in the car and lock all doors using the switch on the drivers door. Then unlock all doors using switch on the key. I found that this worked and the flap would then open when pushed as normal.
Keith Hazelwood's user avatar
2 votes

What should I be looking for in a gas cap?

The gas cap you are looking at is a fairly generic gas cap. However, not just any one will fit on. If you get a gas cap from one of the following vehicles, it should fit: 2006-2012 Chevrolet Impala ...
anonymous2's user avatar
  • 5,235
2 votes

Could a bad purge valve be my problem?

OK, so utilizing information from @MTA about the actual operation of the purge valve, I applied 12 volt DC to it and it operated but never sealed when not energized. This confirmed a bad valve. I took ...
JACK's user avatar
  • 365
2 votes
Accepted

Could a bad purge valve be my problem?

I have no specific knowledge on the 2008 LaCrosse, however -- Be careful with your assumptions. The purge valve is usually under the hood and is normally closed when not energized. The vent valve is ...
MTA's user avatar
  • 6,405
1 vote

How to lock my new locking gas cap

My thinking is, you'd close the cap (screw the cap on) without the key in the cap. Before inserting the cap, put the key in and turn the key clockwise (CW), then remove the key. Put the cap into the ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
1 vote

How to lock my new locking gas cap

With the cap in your hand, insert the key but do not turn it. Twist the cap shut onto the gas filler with the key in the same position, again not turning the key. When the cap has been twisted into ...
DavidRecallsMonica's user avatar
1 vote

Locking gas cap for 2013 Fit?

There are many aftermarket locking gas caps that will work for you. No need to have the dealer install its easy enough to simply remove your old one and turn this one on. Here is an example that is ...
narkeleptk's user avatar
  • 3,780
1 vote

Manual release of fuel door on 1998 VW Beetle

There should be a plastic access panel in the boot (or "trunk" if you're in the US) near the rear light cluster behind where the fuel filler door is, pop that off and you should be able to see the ...
motosubatsu's user avatar
  • 10.1k
1 vote

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

A very common issue on one of my cars. My gas cap has a rubber seal which cracks and causes the light to come on. You said you bought a new cap, was it a universal one or an OEM one? If that doesn't ...
MhQ-6's user avatar
  • 131
1 vote

P0442: Faulty EVAP System

We have found a common failure with the canister vent valve on Mazda 3 and 5 of varying years. Last week we did 1 and this week we have 2. All with a code of P0442. This code is normally set after ...
Brittany's user avatar
1 vote

VW Golf fuel filler cap will not unlock

For any one who has found this thread and is still stuck, I solved this by: Getting a tyre lever inside the fuel cap and gently forcing it open a bit whilst repeatedly pressing unlock on the key fob. ...
Ben's user avatar
  • 11
1 vote

VW Golf fuel filler cap will not unlock

I had this problem with my 2013 Passat wagon. I took the car to the dealer and the mechanic repeatedly pressed the unlock on the remote while at the same time pressing and releasing the fuel flap. ...
Adrian O'Connor's user avatar

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