Make sure all the doors are unlocked, because the fuel door also locks when all the doors are locked. just press in on the right side of the fuel door, and it should open as long as it is unlocked.....i have also seen the locking rod be faulty and not unlock, if this happens you can unlock the door from the right side of the trunk behind the trunk panel
The fuel filter on a 2002 Mercedes C240 is located on the driver's side just inside the wheel well. Not in the wheel well, but just beyond it. If you have the car on a lift, you can't miss it. It's fairly large in diameter and there are 3 hoses going to it. You will have to replace the clamps on it because they are the type you have to break in order to change it.
The user manual recommends only premium fuel for the C240. I happen to have the 2002 C240. Though a bit expensive to fill-up, but the quality of drive is amazing. I have this car also and I've found that if you don't use premium gas your gas hand will not read, and it goes to zero(it malfunctions) its weird.
http://www.installuniversity.com/mb/w203/w203/fp.html
All conventional cars, Diesel or Petrol or Hybrid of either have fuel pumps!!
It is located under the back seat center. remove the front seat nuts and covers to expose the fuel pump. Notice guide holes and fuel pump plastic covers. They should be unscrewed to expose the fuel pump underneath.
if theres not a key hole then its probably a small button in the car otherwise you just pull it open.
Fuel door is locked when car locked, push on the forward part of door, the aft side will pop out.
Well on my 1991 Mercedes Benz 190e the fuel release door is automatic. All you have to do is make sure all the doors are unlocked with the master key and then, go to the fuel door and lightly press in on the left side of the fuel door and pull from the right and it should pop open.
The fuel door is a hinged door over the fuel-tank filling pipe cavity, and swings outwards, on a vertical axis, to be in open position.
The 2002 Mercedes-Benz S-Class runs on premium unleaded (required).
The 2002 Mercedes-Benz G-Class runs on premium unleaded (required).
The 2002 Mercedes-Benz SL-Class runs on premium unleaded (required).