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-   -   Fuel Door Latch (https://www.benzworld.org/forums/c209-a209-clk-class/3023706-fuel-door-latch.html)

gorj 04-18-2019 06:04 PM

Fuel Door Latch
 
I have often wondered why the fuel door latch only engages when the engine is started. It seems to me it would make more sense if the door were latched when the vehicle is parked and not running - to prevent theft of your fuel. All other vehicles I have owned that had a fuel door, latches had to be activated by a button or lever inside the vehicle before they would open. I do know that one should never open the fuel cap when the engine is running, but it would seem having a theft deterrent would trump that.Today, with idiots running around putting "stuff" in fuel tanks, there is even more of a reason to have a locking door! What were the German engineers thinking?

Benzyle 04-18-2019 11:15 PM

Hi Gorj ,
I never knew it locked when the engine is running ,,,,you learn something every day,,,
If it locked when the car was parked (and not locked ) ,,how would you open it to re-fuel ?

When you lock the car ,,the fuel flap locks at the same time...giving you security.

gorj 04-19-2019 12:01 AM

Quote:

Originally Posted by Benzyle (Post 17761008)
Hi Gorj ,
I never knew it locked when the engine is running ,,,,you learn something every day,,,
If it locked when the car was parked (and not locked ) ,,how would you open it to re-fuel ?

When you lock the car ,,the fuel flap locks at the same time...giving you security.

I did not know that. I have never tried to open the fuel door when the vehicle is locked. So the engineers are smart - the door is only open when the vehicle is unlocked and the ignition is off. That makes sense. A 2006 Mercedes has better technology than my wife's 2017 vehicle loaded with all the latest technology, yet you have to pull a lever to open the fuel door!! But I do like the adaptive cruise, the push button start, the navigation, and the lane departure warning in her car.

IWantedaJag 04-19-2019 12:49 PM

I've never tried opening it when driving either, although rightly or wrongly I long ago stopped switching the engine off when fuelling. I figure if modern tires conduct well enough to conduct lightning they conduct well enough to dissipate static (even if the engine wasn't running and they didn't it would spark on the pump nozzle and kaboom!) and engine heat is too far away to worry about.

rcunningham321 04-19-2019 02:21 PM

I also like most of the modern touches, but I'm not yet ready for lane departure warning. I've had it on rental cars and it feels like someone else is also driving the car with me - no thanks.

I'll stick with basic 2005 CLK features. One thing that did surprise me on my car was the rain-sensing wiper system. Still don't see that on some more modern cars.

gorj 04-20-2019 06:23 AM

Quote:

Originally Posted by IWantedaJag (Post 17761532)
I've never tried opening it when driving either, although rightly or wrongly I long ago stopped switching the engine off when fuelling. I figure if modern tires conduct well enough to conduct lightning they conduct well enough to dissipate static (even if the engine wasn't running and they didn't it would spark on the pump nozzle and kaboom!) and engine heat is too far away to worry about.

Switching the ign off while refueling is no so much about causing a fire but it messes with the evap control system. I have even seen the check engine light come on after refueling with engine on.

keyhole 04-22-2019 05:39 AM

Quote:

Originally Posted by gorj (Post 17762226)
Switching the ign off while refueling is no so much about causing a fire but it messes with the evap control system.

Over here in the UK, fuel filling stations often have a prominent sign instructing drivers to stop the engine while filling.

gorj 04-22-2019 07:51 AM

Quote:

Originally Posted by keyhole (Post 17763952)
Over here in the UK, fuel filling stations often have a prominent sign instructing drivers to stop the engine while filling.

I remember seeing signs posted like that here in the US, but have not seen them recently. It has always just made sense to me to turn off the engine. But I live in "bubba" country in Arkansas where they do not do much that makes sense - like drive 4 wheel drive pickup trucks that are two foot off the ground!

keyhole 04-25-2019 08:27 AM

Quote:

Originally Posted by gorj (Post 17760844)
I have often wondered why the fuel door latch only engages when the engine is started.

I was surprised to read this recent statement, and I doubted that it was so. However, like others here I had never checked it (until today) and I can report that on my 2004 CLK the fuel flap does not lock immediately with the engine running. Maybe later models are different?

Of course, if the cluster is set to 'automatic locking', all the doors, the trunk lid and the fuel flap will all lock after the car reaches 9 mph.

Incidentally, in an emergency you can unlock the fuel flap manually by turning a release knob located behind the right side trim panel in the trunk. This is covered in the Operator's Manual.

rudeney 04-27-2019 04:53 PM

The fuel door locks and unlocks with the other doors and trunk. If you are in the car with the engine running and the doors are locked, and you only open the driver's door, the other doors (and the fuel door) stay locked. However, if you shut the engine off and open the driver's door, then all doors (including the fuel filler).


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