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Liters or gallons, depending if your in Canada or US
The fuel sending unit is located in the fuel tank itself. To get to it, you would have to drop your fuel tank, and you would remove it from the top of the fuel tank.
metric unit
litres
In the US, a fish tank's capacity is measured in gallons.
I drop the tank.
The sugar would lay on the bottom of the tank so the only way to know would be to remove the tank and remove the sending unit to gain access to the inside of the tank.
The gas gauge sending unit would be located in the fuel tank.
The fuel pump is in the tank. It is best to remove the tank to replace the fuel pump/sending unit, don't forget to hook up the hose inside the tank that goes to the sending unit!
To do an effective job cleaning a fuel tank, removing the tank from the vehicle and then removing the sending unit from the tank to gain access to the inside of the tank would be the way to go.
It could quite possibly be the sending unit, that is located in the fuel tank. The electronic "board" gets crudded up and you must drop the fuel tank and pull out the sending unit which is part of the fuel pump. It's best to have as little fuel as possible in tank when doing this but It's not that difficult if you have a little mechanical ability. Two straps hold tank to frame. Drop tank, pull unit from top of tank, clean or replace.
Litres.