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  #1  
Old 05-07-2008, 08:10 PM
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Locking fuel filler caps?

So as I pumped 60-odd dollars into my tank, it occurred to me that there was nothing to prevent someone of low morals from stealing my car's precious fuel (I've disabled my vacuum-locking system).

I have a locking cap on my gas car but I don't think that would fit the mouth on my 240D. Is anyone using a locking cap on their vehicle?

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  #2  
Old 05-07-2008, 08:20 PM
daw_two's Avatar
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motivation

It might be motivation to fix those vacuum leaks, right?
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  #3  
Old 05-07-2008, 08:24 PM
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MB locking fuel fillers caps are rare, but available. They pop up on eBay from time to time.
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  #4  
Old 05-07-2008, 08:42 PM
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Fix the vacuum system, MB already provided you with a locking fuel door.

The vacuum system on that car is pretty simple, it shouldn't be to hard to find the leak/s.
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  #5  
Old 05-07-2008, 08:48 PM
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The part number for the fuel cap is 123-471-02-30, it comes with two keys.
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  #6  
Old 05-08-2008, 12:08 PM
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Quote:
Originally Posted by H-townbenzoboy View Post
The part number for the fuel cap is 123-471-02-30, it comes with two keys.
Great! Thanks!
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  #7  
Old 05-08-2008, 12:20 PM
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Did the 300CD come with a locking fuel filler door? Mine doesn't seem to have one, and I haven't been able to locate any switch to operate one either.

Problem with the locking fuel filler door is that most of them can be pried open with a big screwdriver - doing lots of ugly damage to your bodywork and paint in the process. A locking cap on the other hand is a bit tougher to defeat, and if they try they are at least somewhat less likely to damage the body in the process.

I think I'm going to look for one of those locking caps myself. Wonder if anybody made an aftermarket? Probably not - who ever thought diesel would be expensive enough for 20 gallons or less to be worth stealing?
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1984 300 Coupe TurboDiesel
Silver blue paint over navy blue interior
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Charcoal & blue two tone paint over burgundy interior
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  #8  
Old 05-08-2008, 12:24 PM
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On mine, the fuel door locks when you lock the doors and vice-versa...
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  #9  
Old 05-08-2008, 12:31 PM
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Paranoid thinking.........If someone tried to steal the little bit of diesel from an MB it would probably be some punk trying to put it in a gasser. Then you could laugh when their car became disabled on the side of the road.

Besides, it would be much easier to crawl under the car and disconnect the flex hose at the bottom of the tank rather than try and pry open the fuel door......OOPS, I believe I just gave away my secret.
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  #10  
Old 05-08-2008, 12:52 PM
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huh?
 
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Quote:
Originally Posted by rcounts View Post

Problem with the locking fuel filler door is that most of them can be pried open with a big screwdriver - doing lots of ugly damage to your bodywork and paint in the process. A locking cap on the other hand is a bit tougher to defeat, and if they try they are at least somewhat less likely to damage the body in the process.
Is that really a problem? Do you really think a gas thief will pry it open with a screwdriver? My bet is that he'd take his business to the next car...
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  #11  
Old 05-08-2008, 12:54 PM
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Quote:
Originally Posted by KarTek View Post
On mine, the fuel door locks when you lock the doors and vice-versa...
You know, I never thought of trying to open it when the doors were locked. I just tried it and lo and behold, it is locked up tight!

Here's one for you though. I also tried unlocking the doors (from the driver's side) to see if it would unlock and it didn't! Weird! The passenger side door unlocked automatically as it should, but the filler door remained locked. Is there some trick to it? Every time I've gone to put fuel in it it has been unlocked - which is why I didn't even realize it automatically locked. Is there an emergency release or something?

The last thing I want to have happen is to pull into a station to fill up and find I can't get the filler door open!
__________________
1984 300 Coupe TurboDiesel
Silver blue paint over navy blue interior
2nd owner & 2nd engine in an otherwise
99% original unmolested car
~210k miles on the clock

1986 Ford F250 4x4 Supercab
Charcoal & blue two tone paint over burgundy interior
Banks turbo, DRW, ZF-5 & SMF conversion
152k on the clock - actual mileage unknown
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  #12  
Old 05-08-2008, 12:56 PM
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mmmmmm Diesel...
 
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If they will hijack a fuel truck, anything is possible. There have been reports of fuel thieves punching holes in fuel tanks as well.
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  #13  
Old 05-08-2008, 01:53 PM
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Quote:
Originally Posted by sd300td View Post
Is that really a problem? Do you really think a gas thief will pry it open with a screwdriver? My bet is that he'd take his business to the next car...
At my work they dont even take the cap off.....they punch two 3/8" dia drill holes in the tank with a battery operated drill. One to catch fuel from and the other as a vent. When thier 5gal can is filled they leave and let the rest drain into the gutter.
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  #14  
Old 05-08-2008, 03:44 PM
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Where exactly do you work?
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  #15  
Old 05-08-2008, 03:47 PM
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Quote:
Originally Posted by rcounts View Post
You know, I never thought of trying to open it when the doors were locked. I just tried it and lo and behold, it is locked up tight!

Here's one for you though. I also tried unlocking the doors (from the driver's side) to see if it would unlock and it didn't! Weird! The passenger side door unlocked automatically as it should, but the filler door remained locked. Is there some trick to it? Every time I've gone to put fuel in it it has been unlocked - which is why I didn't even realize it automatically locked. Is there an emergency release or something?

The last thing I want to have happen is to pull into a station to fill up and find I can't get the filler door open!
Try double twisting the key in the door and see if that unlocks the fuel door. If not, try the central lock/unlock button inside. I also think there' s way to get at it from inside the trunk but I don't know if that carries back to your model year...

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Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250
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