First. Please understand this vehicle isn't offered in the US, so I have little technical information specific to it.
However, I don't recall seeing any diesel-powered vehicle without glow plugs. They don't heat the fuel. Glow plugs help overcome cold starting issues by preheating the air in the combustion chamber. They are essentially electric heating elements that are installed in the cylinder head of the engine. When the ignition key is turned on, the glow plug controller sends a signal to the glow plugs, which heat up and glow red-hot. This preheats the air in the cylinder and makes it easier to compress, allowing for easier cold starting.
If you have a heater behind the fuel filter works differently and is used for a different reason. A heated fuel filter is used on some diesel engines to prevent the fuel from gelling or waxing in cold temperatures. Diesel fuel contains waxes that can solidify and form a gel when the temperature drops below a certain point. When this happens, the fuel can clog the fuel filter and prevent fuel flow to the engine, causing it to stall or not start at all.
So, the two different circuits you mentioned can be used on the same vehicle for different reasons.
Let me know if that helps answer your question.
Tuesday, February 21st, 2023 AT 8:59 PM