I have a 87 260E and it has an 18 gallon tank and a reserve. they are the same chassis w124. and this info should be in your owners manuel
16 gallons
Look under the trunk of the car. Both the fuel filter and pump are protected by a plastic cover. Remove the cover to access the pump and filter. You will need two wrenches to remove the in-line filter.
about 45 liters
75 liters
When owning a car it is important to know the size of the fuel tank. For a 1983 Mercedes 300TD Wagon, the gas tank size is 18.49 gallons.
I would ask Google.
560 sl has a 5.6 liter engine.
3 liter six cylinder
A 1987 Chevy Silverado has a 20 gal. fuel tank
I have an ac delco model 7641, it's a good and used one i got in the "meanwhile" but where I got it they checked on a reference catalog so I am positive that this is the one.
14 galoons
It depends on the model and engine displacement. My W124 220E has a 70 liter fuel tank capacity.